View source for World War I

{{Short description|1914–1918 global conflict}}
{{redirect-several|WWI|The First World War|World War One|Great War}}
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{{Use dmy dates|date=August 2023}}{{use British English|date=July 2014}}
{{Infobox military conflict
| conflict          = World War I
| image             = {{Multiple image
| perrow            = 2/2/2
| image1            = Bataille de Verdun 1916.jpg
| image2            = Germanmachineguncrew1918.webp
| image3            = British artillery in action, World War I.JPEG
| image4            = American troops going forward to the battle line in the Forest of Argonne. France, September 26, 1918. - NARA - 530748.jpg
| image5            = ArabCamelCorps.jpg
| image6            = Przemysl Fortress Bain LOC 19648.jpg
| border            = infobox
| total_width       = 300}}'''From top to bottom, left to right''': {{flatlist|
* French attack from a trench at the [[Battle of Verdun]], 1916
* German machine gun crew wearing [[gas mask]]s, 1918
* British artillery in action at the [[Battle of the Somme]], 1916
* U.S. troops and [[Renault FT]] tanks during the [[Hundred Days Offensive]], 1918
* Ottoman Arab camel corps leaving for the [[Middle Eastern theatre of World War I|Middle Eastern front]], 1916
* Aftermath of the Russian [[siege of Przemyśl]] in [[Austria-Hungary]], 1915}}
| date              = 28 July 1914{{snd}}11 November 1918 {{nwr|({{Age in years, months, weeks and days|month1=7|day1=28|year1=1914|month2=11|day2=11|year2=1918}})}}
| territory         = {{bulletlist|[[Partition of the Ottoman Empire]], [[dissolution of Austria-Hungary]], transfer of [[German colonial empire|German colonies]] and territories to other countries|Formation of new countries in Europe and the Middle East, such as [[Second Polish Republic|Poland]], [[Kingdom of Yugoslavia|Yugoslavia]], [[Weimar Republic|Weimar Germany]], [[Russian Soviet Federative Socialist Republic|Soviet Russia]] and [[Soviet Union]], [[Lithuania]], [[History of Estonia (1920–1939)|Estonia]], [[Latvia]], [[First Austrian Republic|Austria]], [[First Hungarian Republic|Hungary]], [[First Czechoslovak Republic|Czechoslovakia]], [[Turkey]], [[Kingdom of Hejaz|Hejaz]], and [[Mutawakkilite Kingdom of Yemen|Yemen]]
}}
| place             = {{flatlist|
* [[European theatre of World War I|Europe]]
* [[Middle Eastern theatre of World War I|Middle East]]
* [[African theatre of World War I|Africa]]
* [[Asian and Pacific theatre of World War I|Pacific]]
* [[Atlantic U-boat campaign of World War I|Atlantic]]
* [[Naval warfare in the Mediterranean during World War I|Mediterranean and Adriatic]]
}}
| result            = [[Allies of World War I|Allied Powers]] victory {{nwr|(see [[Aftermath of World War I]])}}
| combatant1        = '''[[Allies of World War I|Allied Powers]]:'''{{ubl
|{{flagcountry|French Third Republic}}
|{{flagcountry|United Kingdom of Great Britain and Ireland}}}}
{{collapsible list|bullets=yes|title={{nobold|&nbsp;and [[British Empire|Empire]]:}}
|framestyle=border:none; padding:0;
|{{flag|Australia}}
|{{flagdeco|Canada|1907}} [[Canada in the World Wars and Interwar Years|Canada]]
|{{flagcountry|British Ceylon}}
|{{flagcountry|Sultanate of Egypt}}
|{{flag|Newfoundland}}
|{{flag|Dominion of New Zealand|name=New Zealand}}
|{{flagcountry|British Raj}}
|{{flagcountry|Union of South Africa|1912}}}}
{{ubl
| {{flagdeco|Russian Empire|1914}} [[Russian Empire|Russia]]{{Efn|The Russian Empire during 1914–1917, the [[Russian Republic]] during 1917. The [[Bolsheviks|Bolshevik]] government signed a [[Treaty of Brest-Litovsk|separate peace]] with the Central Powers shortly after their [[October Revolution|armed seizure of power]], resulting in a Central Powers victory on the [[Eastern Front (World War I)|Eastern Front]] of the war, and the [[Russian Soviet Federative Socialist Republic]]'s defeat. However, this peace treaty was nullified by an Allied Powers victory on the [[Western Front (World War I)|Western Front]], and the end of the war.}}
| {{flagcountry|Kingdom of Italy|1861}} (from 1915)
| {{flagcountry|United States|1912}} {{nwr|(from 1917)}}
| {{flagcountry|Empire of Japan}}
}}
[[Allies of World War I|''and others''{{nbsp}}...]]
| combatant2        = '''[[Central Powers]]:'''{{plainlist|
* {{flagcountry|German Empire}}
* {{flag|Austria-Hungary}}
* {{flag|Ottoman Empire}}
* {{flagcountry|Kingdom of Bulgaria}} (from 1915)
 }}
[[Central Powers|''and others''{{nbsp}}...]]
| commander1        = See [[Allied leaders of World War I|Main Allied leaders]]
| commander2        = See [[Leaders of the Central Powers of World War I|Main Central leaders]]
| casualties1       = {{plainlist|
* '''Military dead:'''
* Over 5,525,000
* '''Civilian dead:'''
* Over 4,000,000
* '''Total dead:'''
* Over 9,000,000
* [[World War I casualties|...''further details'']]}}
| casualties2       = {{plainlist|
* '''Military dead:'''
* Over 4,386,000
* '''Civilian dead:'''
* Over 3,700,000
* '''Total dead:'''
* Over 8,000,000
* [[World War I casualties|...''further details'']]}}
| campaignbox       = {{Campaignbox World War I}}
}}

'''World War I'''{{efn|Often abbreviated as '''WWI''' or '''WW1'''}} or the '''First World War''' (28 July 1914 – 11 November 1918), also known as the '''Great War''', was a [[World war|global conflict]] between two coalitions: the [[Allies of World War I|Allies]] (or Entente) and the [[Central Powers]].<!--Please discuss before changing the first sentence, don't edit war but try to reach a consensus. Modified as of 03:09, 16 December 2023 per rough consensus in long discussion [[Talk:World War I#The Great War]]--> Fighting took place mainly in [[European theatre of World War I|Europe]] and the [[Middle Eastern theatre of World War I|Middle East]], as well as in parts of [[African theatre of World War I|Africa]] and the [[Asian and Pacific theatre of World War I|Asia-Pacific]], and in Europe was characterised by [[trench warfare]] and the use of [[Artillery of World War I|artillery]], machine guns, and [[Chemical weapons in World War I|chemical weapons]] (gas). World War I was one of the [[List of wars by death toll|deadliest conflicts in history]], resulting in an estimated [[World War I casualties|9 million military dead and 23 million wounded]], plus up to 8 million civilian deaths from causes including [[Genocides in history (World War I through World War II)|genocide]]. The movement of large numbers of people was a major factor in the [[Spanish flu]] pandemic, which killed millions.

The [[causes of World War I]] included the rise of [[German Empire|Germany]] and [[Decline and modernization of the Ottoman Empire|decline of the Ottoman Empire]], which disturbed the long-standing [[Balance of power (international relations)|balance of power]] in Europe, as well as economic competition between nations triggered by [[Second Industrial Revolution|industrialisation]] and [[New Imperialism|imperialism]]. Growing tensions between the [[great power]]s and in the [[Balkans]] reached [[July Crisis|a breaking point]] on 28 June 1914, when a [[Bosnian Serb]] named [[Gavrilo Princip]] [[Assassination of Archduke Franz Ferdinand|assassinated Archduke Franz Ferdinand]], heir to the [[Austria-Hungary|Austro-Hungarian]] throne. Austria-Hungary held [[Kingdom of Serbia|Serbia]] responsible, and declared war on 28 July. After [[Russian Empire|Russia]] mobilised in Serbia's defence, Germany declared war on Russia; by 4 August, [[French Third Republic|France]] and the [[United Kingdom of Great Britain and Ireland|United Kingdom]] were drawn in, with the Ottomans joining in November. [[Schlieffen Plan|Germany's strategy in 1914]] was to quickly defeat France, then to transfer its forces to the east. However, this failed, and by the end of the year the [[Western Front (World War I)|Western Front]] consisted of a continuous line of trenches stretching from the English Channel to Switzerland. The [[Eastern Front (World War I)|Eastern Front]] was more dynamic, but neither side gained a decisive advantage, despite costly offensives. [[Military history of Italy during World War I|Italy]], [[Bulgaria during World War I|Bulgaria]], [[Romania in World War I|Romania]], [[Greece during World War I|Greece]] and others joined in from 1915 onward.

In April 1917, the [[American entry into World War I|United States entered the war]] on the Allied side following Germany's resumption of [[Unrestricted submarine warfare (February 1917)|unrestricted submarine warfare]] against Atlantic shipping. Later that year, the [[Bolsheviks]] seized power in the Russian [[October Revolution]]; [[Russian Soviet Federative Socialist Republic|Soviet Russia]] signed [[Armistice between Russia and the Central Powers|an armistice]] with the Central Powers in December, followed by [[Treaty of Brest-Litovsk|a separate peace]] in March 1918. That month, Germany launched [[German spring offensive|an offensive in the west]], which despite initial successes left the [[Imperial German Army|German Army]] exhausted and demoralised. [[Hundred Days Offensive|A successful Allied counter-offensive]] from August 1918 caused a collapse of the German front line. By early November, Bulgaria, the Ottoman Empire and Austria-Hungary had each signed armistices with the Allies, leaving Germany isolated. Facing [[German revolution of 1918–1919|a revolution at home]], [[Wilhelm II, German Emperor|Kaiser Wilhelm{{nbsp}}II]] abdicated on 9 November, and the war ended with the [[Armistice of 11 November 1918]].

The [[Paris Peace Conference (1919–1920)|Paris Peace Conference]] of 1919–1920 imposed settlements on the defeated powers, most notably the [[Treaty of Versailles]], by which Germany lost significant territories, was disarmed, and was required to pay large [[war reparations]] to the Allies. The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires redrew national boundaries and resulted in the creation of new independent states, including [[Second Polish Republic|Poland]], [[Finland]], the [[Baltic states]], [[First Czechoslovak Republic|Czechoslovakia]], and [[Kingdom of Yugoslavia|Yugoslavia]]. The [[League of Nations]] was established to maintain world peace, but its failure to manage instability during the [[interwar period]] contributed to the outbreak of [[World War II]] in 1939.

== Names ==
Before [[World War II]], the events of 1914–1918 were generally known as the '''''Great War''''' or simply the '''''World War'''''.{{sfn |Braybon |2004 |p=8}} In August 1914, the magazine ''[[The Independent (New York City)|The Independent]]'' wrote "This is the Great War. It names itself".<ref name="independent19140817">{{Cite magazine |date=1914-08-17 |title=The Great War |url=https://archive.org/details/independen79v80newy/page/n233/mode/1up?view=theater |magazine=The Independent |page=228 |access-date=2022-05-17}}</ref> In October 1914, the Canadian magazine ''[[Maclean's]]'' similarly wrote, "Some wars name themselves. This is the Great War."<ref>{{cite web |url=http://www.oed.com/view/Entry/81104 |title=great, adj., adv., and n |website=Oxford English Dictionary |access-date=19 March 2012 |archive-date=14 May 2019 |archive-url=https://web.archive.org/web/20190514194006/https://www.oed.com/view/Entry/81104 |url-status=live |url-access=subscription}}</ref> Contemporary Europeans also referred to it as "[[the war to end war]]" and it was also described as "the war to end all wars" due to their perception of its unparalleled scale, devastation, and loss of life.<ref>{{cite news |url=http://news.bbc.co.uk/2/hi/special_report/1998/10/98/world_war_i/198172.stm |title=The war to end all wars |work=BBC News |date=10 November 1998 |access-date=15 December 2015 |archive-date=19 June 2015 |archive-url=https://web.archive.org/web/20150619035838/http://news.bbc.co.uk/2/hi/special_report/1998/10/98/world_war_i/198172.stm |url-status=live }}</ref> The first recorded use of the term ''First World War'' was in September 1914 by German biologist and philosopher [[Ernst Haeckel]] who stated, "There is no doubt that the course and character of the feared 'European War'&nbsp;... will become the first world war in the full sense of the word."{{sfn |Shapiro |Epstein |2006 |p=329}}

== Background ==
{{Main|Causes of World War I}}

=== Political and military alliances ===
[[File:Map Europe alliances 1914-en.svg|thumb|alt=Map of Europe focusing on Austria-Hungary and marking the central location of ethnic groups in it including Slovaks, Czechs, Slovenes, Croats, Serbs, Romanians, Ukrainians, Poles.|Rival military coalitions in 1914:{{Efn|Only the Triple Alliance was a formal "alliance"; the others listed were informal patterns of support.}} {{legend|#83be58|[[Triple Entente]]}}{{legend|#b0a336|[[Triple Alliance (1882)|Triple Alliance]]}}|left]]

For much of the 19th century, the major European powers maintained a tenuous [[Balance of power (international relations)|balance of power]], known as the [[Concert of Europe]].{{sfn |Clark |2013 |pp=121–152}} After 1848, this was challenged by Britain's withdrawal into so-called [[splendid isolation]], the [[Decline and modernization of the Ottoman Empire|decline of the Ottoman Empire]], [[New Imperialism]], and the rise of [[Kingdom of Prussia|Prussia]] under [[Otto von Bismarck]]. Victory in the 1870–1871 [[Franco-Prussian War]] allowed Bismarck to [[Unification of Germany|consolidate]] a [[German Empire]]. Post-1871, the primary aim of French policy was to [[Revanchism|avenge]] this defeat,{{sfn|Zeldin|1977|p=117}} but by the early 1890s, this had switched to the expansion of the [[French colonial empire]].<ref>Bertrand Joly, "La France et la Revanche (1871–1914)", ''Revue d'Histoire Moderne & Contemporaine''. 1999, vol. 46-2, pp. 325–347 [https://www.persee.fr/doc/rhmc_0048-8003_1999_num_46_2_1965] {{Webarchive|url=https://web.archive.org/web/20240127144111/https://www.persee.fr/doc/rhmc_0048-8003_1999_num_46_2_1965|date=27 January 2024}}</ref>

In 1873, Bismarck negotiated the [[League of the Three Emperors]], which included [[Austria-Hungary]], [[Russian Empire|Russia]] and Germany. After the 1877–1878 [[Russo-Turkish War (1877–1878)|Russo-Turkish War]], the League was dissolved due to Austrian concerns over the expansion of Russian influence in the [[Balkans]], an area they considered to be of vital strategic interest. [[Germany]] and Austria-Hungary then formed the 1879 [[Dual Alliance (1879)|Dual Alliance]], which became the [[Triple Alliance (1882)|Triple Alliance]] when Italy joined in 1882.{{sfn|Keegan|1998|p=52}} For Bismarck, the purpose of these agreements was to isolate France by ensuring the three Empires resolve any disputes between themselves. In 1887, Bismarck set up the [[Reinsurance Treaty]], a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria-Hungary.{{Sfn|Medlicott|1945|pp=66–70}}

[[File:World 1914 empires colonies territory.PNG|thumb|upright=1.4|World empires and colonies {{circa}} 1914]]

For Bismarck, peace with Russia was the foundation of German foreign policy but in 1890, he was forced to retire by [[Wilhelm II, German Emperor|Wilhelm II]]. The latter was persuaded not to renew the Reinsurance Treaty by his new [[Chancellor of Germany|Chancellor]], [[Leo von Caprivi]].{{Sfn|Keenan|1986 |p=20}} This gave France an opening to agree the [[Franco-Russian Alliance]] in 1894, which was then followed by the 1904 ''[[Entente Cordiale]]'' with Britain. The [[Triple Entente]] was completed by the 1907 [[Anglo-Russian Convention]]. While not formal alliances, by settling [[Great Game|long-standing colonial disputes in Asia]] and Africa, British support for France or Russia in any future conflict became a possibility.{{Sfn|Willmott|2003|p=15}} This was accentuated by British and Russian support for France against Germany during the 1911 [[Agadir Crisis]].{{Sfn|Fay|1930|pp=290–293}}

=== Arms race ===
[[File:Bundesarchiv DVM 10 Bild-23-61-23, Linienschiff "SMS Rheinland".jpg|thumb|left|{{SMS|Rheinland}}, a {{sclass|Nassau|battleship|2}}, Germany's first response to the British ''Dreadnought'', 1910]]

German economic and industrial strength continued to expand rapidly post-1871. Backed by Wilhelm II, Admiral [[Alfred von Tirpitz]] sought to use this growth to build an [[Imperial German Navy]], that could compete with the British [[Royal Navy]].{{Sfn|Willmott|2003|p=21}} This policy was based on the work of US naval author [[Alfred Thayer Mahan]], who argued that possession of a [[blue-water navy]] was vital for global power projection; Tirpitz had his books translated into German, while Wilhelm made them required reading for his advisors and senior military personnel.{{Sfn|Herwig|1988|pp=72–73}}

However, it was also an emotional decision, driven by Wilhelm's simultaneous admiration for the Royal Navy and desire to surpass it. Bismarck thought that the British would not interfere in Europe, as long as its maritime supremacy remained secure, but his dismissal in 1890 led to a change in policy and an [[Anglo-German naval arms race]] began.{{Sfn|Moll|Luebbert|1980|pp=153–185}} Despite the vast sums spent by Tirpitz, the launch of {{HMS|Dreadnought|1906|6}} in 1906 gave the British a technological advantage.{{Sfn|Willmott|2003|p=21}} Ultimately, the race diverted huge resources into creating a German navy large enough to antagonise Britain, but not defeat it; in 1911, Chancellor [[Theobald von Bethmann Hollweg]] acknowledged defeat, leading to the ''Rüstungswende'' or 'armaments turning point', when he switched expenditure from the navy to the army.{{sfn|Stevenson|2016|p=45}}

This decision was not driven by a reduction in political tensions but by German concern over Russia's quick recovery from its defeat in the [[Russo-Japanese War]] and subsequent [[1905 Russian Revolution]]. Economic reforms led to a significant post-1908 expansion of railways and transportation infrastructure, particularly in its western border regions.{{Sfn|Crisp|1976|pp=174–196}} Since Germany and Austria-Hungary relied on faster mobilisation to compensate for their numerical inferiority compared to Russia, the threat posed by the closing of this gap was more important than competing with the Royal Navy. After Germany expanded its standing army by 170,000 troops in 1913, France extended compulsory military service from two to three years; similar measures were taken by the [[Balkans|Balkan powers]] and Italy, which led to increased expenditure by the [[Ottoman Empire|Ottomans]] and Austria-Hungary. Absolute figures are difficult to calculate due to differences in categorising expenditure since they often omit civilian infrastructure projects like railways which had logistical importance and military use. It is known, however, that from 1908 to 1913, military spending by the six major European powers increased by over 50% in real terms.{{sfn|Stevenson|2016|p=42}}

=== Conflicts in the Balkans ===
[[File:Austria Hungary ethnic.svg|thumb|upright=1.3|Ethno-linguistic map of Austria-Hungary, 1910. [[Bosnian Crisis|Bosnia-Herzegovina was annexed]] in 1908.]]
[[File:1908-10-07 - Moritz Schiller's Delicatessen.jpg|thumb|alt=Photo of large white building with one sign saying "Moritz Schiller" and another in Arabic; in front is a cluster of people looking at a poster on the wall.|Sarajevo citizens reading a poster with the proclamation of the [[Bosnian Crisis|Austrian annexation in 1908]]]]

The years before 1914 were marked by a series of crises in the Balkans, as other powers sought to benefit from the Ottoman decline. While [[Pan-Slavism|Pan-Slavic]] and [[Eastern Orthodox Church|Orthodox]] Russia considered itself the protector of [[Kingdom of Serbia|Serbia]] and other [[Slavs|Slav]] states, they preferred the strategically vital [[Bosporus]] straits to be controlled by a weak Ottoman government, rather than an ambitious Slav power like [[Kingdom of Bulgaria|Bulgaria]]. Russia had ambitions in northeastern [[Anatolia]] while its clients had overlapping claims in the Balkans. These competing interests divided Russian policy-makers and added to regional instability.{{Sfn|McMeekin|2015|pp=66–67}}

Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire and saw Serbian expansion as a direct threat. The 1908–1909 [[Bosnian Crisis]] began when Austria annexed the former Ottoman territory of [[Bosnia Vilayet|Bosnia and Herzegovina]], which it [[Austro-Hungarian campaign in Bosnia and Herzegovina in 1878|had occupied]] since 1878. Timed to coincide with the [[Bulgarian Declaration of Independence]] from the Ottoman Empire, this unilateral action was denounced by the European powers, but accepted as there was no consensus on how to resolve the situation. Some historians see this as a significant escalation, ending any chance of Austria cooperating with Russia in the Balkans, while also damaging diplomatic relations between Serbia and Italy.{{Sfn|Clark|2013|p=86}}

Tensions increased after the 1911–1912 [[Italo-Turkish War]] demonstrated Ottoman weakness and led to the formation of the [[Balkan League]], an alliance of Serbia, Bulgaria, [[Kingdom of Montenegro|Montenegro]], and [[Kingdom of Greece|Greece]].{{Sfn|Clark|2013|pp=251–252}} The League quickly overran most of the Ottomans' territory in the Balkans during the 1912–1913 [[First Balkan War]], much to the surprise of outside observers.{{Sfn|McMeekin|2015|p=69}} The Serbian capture of ports on the [[Albanian Adriatic Sea Coast|Adriatic]] resulted in partial Austrian mobilisation, starting on 21 November 1912, including units along the Russian border in [[Galicia (Eastern Europe)|Galicia]]. The [[Council of Ministers of the Russian Empire|Russian government]] decided not to mobilise in response, unprepared to precipitate a war.{{Sfn|McMeekin|2015|p=73}}

The Great Powers sought to re-assert control through the 1913 [[Treaty of London (1913)|Treaty of London]], which had created an independent [[Albania]] while enlarging the territories of Bulgaria, Serbia, Montenegro and Greece. However, disputes between the victors sparked the 33-day [[Second Balkan War]], when Bulgaria attacked Serbia and Greece on 16 June 1913; it was defeated, losing most of [[Macedonia (region)|Macedonia]] to Serbia and Greece, and [[Southern Dobruja]] to Romania.{{sfn|Willmott|2003|pp=2–23}} The result was that even countries which benefited from the Balkan Wars, such as Serbia and Greece, felt cheated of their "rightful gains", while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns, including Germany.{{Sfn|Clark|2013|p=288}} This complex mix of resentment, nationalism and insecurity helps explain why the pre-1914 Balkans became known as the "[[powder keg of Europe]]".{{sfn |Keegan|1998|pp=48–49}}<ref>{{Citation |last=Bennett |first=G. H. |title=Eastern Europe: Cordon Sanitaire or Powder-Keg? |date=1995 |work=British Foreign Policy during the Curzon Period, 1919–24 |pages=41–59 |editor-last=Bennett |editor-first=G. H. |url=https://doi.org/10.1057/9780230377356_3 |access-date=2024-06-10 |place=London |publisher=Palgrave Macmillan UK |language=en |doi=10.1057/9780230377356_3 |isbn=978-0-230-37735-6 |archive-date=10 June 2024 |archive-url=https://web.archive.org/web/20240610092152/https://link.springer.com/chapter/10.1057/9780230377356_3 |url-status=live }}</ref><ref>{{Citation |last=Stefanova |first=Radoslava |title=Balkan Clutter: American and European Handling of a Powder Keg |date=2001 |work=Revival: The New Transatlantic Agenda (2001) |url=https://www.taylorfrancis.com/chapters/edit/10.4324/9781315186405-8/balkan-clutter-american-european-handling-powder-keg-radoslava-stefanova |access-date=2024-06-10 |publisher=Routledge |doi=10.4324/9781315186405-8/balkan-clutter-american-european-handling-powder-keg-radoslava-stefanova |doi-broken-date=1 November 2024 |isbn=978-1-315-18640-5 |archive-date=10 June 2024 |archive-url=https://web.archive.org/web/20240610092039/https://www.taylorfrancis.com/chapters/edit/10.4324/9781315186405-8/balkan-clutter-american-european-handling-powder-keg-radoslava-stefanova |url-status=live }}</ref><ref>{{Cite journal |last=Nelson |first=Daniel N. |date=1984 |title=South-Eastern Europe After Tito: A Powder-Keg for the 1980s? Edited by David Carlton and Carlo Schaerf. New York: St. Martin's Press, 1983. xviii, 211 pp. Map. $22.50. |url=http://dx.doi.org/10.2307/2499359 |journal=Slavic Review |volume=43 |issue=4 |pages=717–718 |doi=10.2307/2499359 |jstor=2499359 |issn=0037-6779 |access-date=10 June 2024 |archive-date=10 June 2024 |archive-url=https://web.archive.org/web/20240610092151/https://www.cambridge.org/core/journals/slavic-review/article/abs/southeastern-europe-after-tito-a-powderkeg-for-the-1980s-edited-by-david-carlton-and-carlo-schaerf-new-york-st-martins-press-1983-xviii-211-pp-map-2250/4181F817AE85A199042097EB78F7591D |url-status=live }}</ref>

== Prelude ==
{{For timeline|Timeline of World War I}}

=== Sarajevo assassination ===
{{Main|Assassination of Archduke Franz Ferdinand}}
[[File:Gavrilo Princip captured in Sarajevo 1914.jpg|thumb|Traditionally thought to show the arrest of [[Gavrilo Princip]] (right), [[Arrest of a suspect in Sarajevo|this photo]] is now believed by historians to depict an innocent bystander, Ferdinand Behr on 28 June 1914.{{Sfn|Finestone|Massie|1981 |p=247}}{{sfn|Smith|2010|p=}}]]
On 28 June 1914, [[Archduke Franz Ferdinand of Austria]], heir presumptive to Emperor [[Franz Joseph I of Austria]], visited [[Sarajevo]], the capital of the recently annexed [[Bosnia and Herzegovina]]. [[Cvjetko Popović]], [[Gavrilo Princip]], [[Nedeljko Čabrinović]], [[Trifko Grabež]], [[Vaso Čubrilović]] ([[Serbs of Bosnia and Herzegovina|Bosnian Serbs]]) and [[Muhamed Mehmedbašić]] (from the [[Bosniaks]] community),{{Sfn|Butcher|2014|p=103}} from the movement known as [[Young Bosnia]], took up positions along the Archduke's motorcade route, to assassinate him. Supplied with arms by extremists within the Serbian [[Black Hand (Serbia)|Black Hand]] intelligence organisation, they hoped his death would free Bosnia from Austrian rule.{{Sfn|Butcher|2014|pp=188–189}}

Čabrinović threw a [[grenade]] at the Archduke's car and injured two of his aides. The other assassins were also unsuccessful. An hour later, as Ferdinand was returning from visiting the injured officers in hospital, his car took a wrong turn into a street where [[Gavrilo Princip]] was standing. He fired two pistol shots, fatally wounding Ferdinand and his wife [[Sophie, Duchess of Hohenberg|Sophie]].{{Sfn|Gilbert|1994|p=16}}

According to historian [[Zbyněk Zeman]], in Vienna "the event almost failed to make any impression whatsoever. On 28 and 29 June, the crowds listened to music and drank wine, as if nothing had happened."{{sfn |Willmott |2003 |p=26}} Nevertheless, the impact of the murder of the heir to the throne was significant, and has been described by historian [[Christopher Clark]] as a "9/11 effect, a terrorist event charged with historic meaning, transforming the political chemistry in Vienna".<ref name="Christopher Clark 2014">{{cite AV media |title=Month of Madness |first=Christopher |last=Clark |publisher=BBC Radio 4 |date=25 June 2014 |url=http://www.bbc.co.uk/programmes/b03t7p27 |access-date=14 March 2017 |archive-date=20 April 2017 |archive-url=https://web.archive.org/web/20170420031224/http://www.bbc.co.uk/programmes/b03t7p27 |url-status=live }}</ref>

=== Expansion of violence in Bosnia and Herzegovina ===
[[File:1914-06-29 - Aftermath of attacks against Serbs in Sarajevo.png|thumb|Crowds on the streets in the aftermath of the [[anti-Serb riots in Sarajevo]], 29 June 1914]]

Austro-Hungarian authorities encouraged subsequent [[anti-Serb riots in Sarajevo]].<ref name="DjordjevićSpence1992">{{cite book |first1=Dimitrije |last1=Djordjević |author1-link=Dimitrije Đorđević (historian) |first2=Richard B. |last2=Spence |author2-link=Richard B. Spence |title=Scholar, patriot, mentor: historical essays in honour of Dimitrije Djordjević |url=https://books.google.com/books?id=CDJpAAAAMAAJ&pg=PA313 |year=1992 |publisher=East European Monographs |isbn=978-0-88033-217-0 |page=313 |quote=Following the assassination of Franz Ferdinand in June 1914, Croats and Muslims in Sarajevo joined forces in an anti-Serb pogrom. |access-date=12 November 2018 |archive-date=17 February 2024 |archive-url=https://web.archive.org/web/20240217084004/https://books.google.com/books?id=CDJpAAAAMAAJ&pg=PA313 |url-status=live }}</ref><ref>{{cite book |title=Reports Service: Southeast Europe series |url=https://books.google.com/books?id=QGtWAAAAMAAJ |access-date=7 December 2013 |year=1964 |publisher=American Universities Field Staff. |page=44 |quote=...&nbsp;the assassination was followed by officially encouraged anti-Serb riots in Sarajevo&nbsp;... |archive-date=6 September 2023 |archive-url=https://web.archive.org/web/20230906101816/https://books.google.com/books?id=QGtWAAAAMAAJ |url-status=live }}</ref> Violent actions against ethnic Serbs were also organised outside Sarajevo, in other cities in Austro-Hungarian-controlled Bosnia and Herzegovina, Croatia and Slovenia. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. A further 460 Serbs were sentenced to death. A predominantly Bosniak special militia known as the ''[[Schutzkorps]]'' was established, and carried out the persecution of Serbs.<ref name="Kröll2008">{{cite book |first=Herbert |last=Kröll |title=Austrian-Greek encounters over the centuries: history, diplomacy, politics, arts, economics |url=https://books.google.com/books?id=uJRnAAAAMAAJ |access-date=1 September 2013 |year=2008 |publisher=Studienverlag |isbn=978-3-7065-4526-6 |page=55 |quote=...&nbsp;arrested and interned some 5.500 prominent Serbs and sentenced to death some 460 persons, a new Schutzkorps, an auxiliary militia, widened the anti-Serb repression. |archive-date=17 February 2024 |archive-url=https://web.archive.org/web/20240217083931/https://books.google.com/books?id=uJRnAAAAMAAJ |url-status=live }}</ref>{{sfn |Tomasevich |2001 |p=485}}<ref name="Schindler2007">{{cite book |first=John R. |last=Schindler |title=Unholy Terror: Bosnia, Al-Qa'ida, and the Rise of Global Jihad |url=https://books.google.com/books?id=c8Xb6x2XYvIC&pg=PA29 |year=2007 |publisher=Zenith Imprint |isbn=978-1-61673-964-5 |page=29 |access-date=12 November 2018 |archive-date=17 February 2024 |archive-url=https://web.archive.org/web/20240217083936/https://books.google.com/books?id=c8Xb6x2XYvIC&pg=PA29#v=onepage&q&f=false |url-status=live }}</ref>{{sfn|Velikonja |2003 |p=141}}

=== July Crisis ===
{{Main|July Crisis}}
{{seealso|German entry into World War I|Austro-Hungarian entry into World War I|Russian entry into World War I}}
[[File:The War of the Nations WW1 337.jpg|thumb|Cheering crowds in London and Paris on the day war was declared.]]

The assassination initiated the July Crisis, a month of diplomatic manoeuvring between Austria-Hungary, Germany, Russia, France and Britain. Believing that Serbian intelligence helped organise Franz Ferdinand's murder, Austrian officials wanted to use the opportunity to end their interference in Bosnia and saw war as the best way of achieving this.{{sfn|Stevenson|1996|p=12}} However, the [[Foreign Ministry of Austria-Hungary|Foreign Ministry]] had no solid proof of Serbian involvement.{{Sfn|MacMillan|2013|p=532}} On 23{{nbsp}}July, Austria delivered an [[July Ultimatum|ultimatum]] to Serbia, listing ten demands made intentionally unacceptable to provide an excuse for starting hostilities.{{sfn|Willmott|2003|p=27}}

Serbia ordered general [[mobilization]] on 25{{nbsp}}July, but accepted all the terms, except for those empowering Austrian representatives to suppress "subversive elements" inside Serbia, and take part in the investigation and trial of Serbians linked to the assassination.{{Sfn|Fromkin|2004|pp=196–197}}{{Sfn|MacMillan|2013|p=536}} Claiming this amounted to rejection, Austria broke off diplomatic relations and ordered partial mobilisation the next day; on 28 July, they declared war on Serbia and began shelling [[Belgrade]]. Russia ordered general mobilization in support of Serbia on 30 July.{{Sfn|Lieven|2016|p=326}}

Anxious to ensure backing from the [[Social Democratic Party of Germany|SPD]] political opposition by presenting Russia as the aggressor, German Chancellor Bethmann Hollweg delayed the commencement of war preparations until 31 July.{{Sfn|Clark|2013|pp=526–527}} That afternoon, the Russian government were handed a note requiring them to "cease all war measures against Germany and Austria-Hungary" within 12 hours.{{Sfn|Martel|2014|p=335}} A further German demand for neutrality was refused by the French who ordered general mobilization but delayed declaring war.{{Sfn|Gilbert|1994|p=27}} The [[German General Staff]] had long assumed they faced a war on two fronts; the [[Schlieffen Plan]] envisaged using 80% of the army to defeat France, then switching to Russia. Since this required them to move quickly, mobilization orders were issued that afternoon.{{Sfn|Clayton|2003|p=45}} Once the German ultimatum to Russia expired on the morning of 1 August, the two countries were at war. 

At a meeting on 29 July, the British cabinet had narrowly decided its obligations to Belgium under the 1839 [[Treaty of London (1839)|Treaty of London]] did not require it to oppose a German invasion with military force; however, Prime Minister [[H. H. Asquith|Asquith]] and his senior Cabinet ministers were already committed to supporting France, the Royal Navy had been mobilised, and public opinion was strongly in favour of intervention.{{Sfn|Clark|2013|pp=539–541}} On 31 July, Britain sent notes to Germany and France, asking them to respect Belgian neutrality; France pledged to do so, but Germany did not reply.{{Sfn|Gilbert|1994|p=29}} Aware of German plans to attack through Belgium, French Commander-in-Chief [[Joseph Joffre]] asked his government for permission to cross the border and pre-empt such a move. To avoid violating Belgian neutrality, he was told any advance could come only after a German invasion.{{Sfn|MacMillan|2013|pp=579–580, 585}} Instead, the French cabinet ordered its Army to withdraw 10&nbsp;km behind the German frontier, to avoid provoking war. On 2 August, [[German occupation of Luxembourg during World War I|Germany occupied Luxembourg]] and exchanged fire with French units when German patrols entered French territory; on 3{{nbsp}}August, they declared war on France and demanded free passage across Belgium, which was refused. Early on the morning of 4{{nbsp}}August, the Germans invaded, and [[Albert I of Belgium]] called for assistance under the [[Treaty of London (1839)|Treaty of London]].{{sfn|Crowe |2001|pp=4–5}}{{sfn |Willmott|2003|p=29}} Britain sent Germany an ultimatum demanding they withdraw from Belgium; when this expired at midnight, without a response, the two empires were at war.{{Sfn|Clark|2013|pp=550–551}}

== Progress of the war ==
{{Further|Diplomatic history of World War I}}

=== Opening hostilities ===

==== Confusion among the Central Powers ====
Germany promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia.{{sfn |Strachan |2003 |pp=292–296, 343–354}}<!-- may be able to find more on this in Samuel R. Williamson, Jr: "Austria-Hungary and the Origins of the First World War" -->

==== Serbian campaign ====
{{Main|Serbian campaign}}
[[File:FirstSerbianArmedPlane1915.jpg|thumb|right|Serbian Army [[Blériot XI]] "Oluj", 1915]]

Beginning on 12 August, the Austrians and Serbs clashed at the battles of the [[Battle of Cer|Cer]] and [[Battle of Kolubara|Kolubara]]; over the next two weeks, Austrian attacks were repulsed with heavy losses. As a result, Austria had to keep sizeable forces on the Serbian front, weakening their efforts against Russia.{{sfn|Tucker|Roberts|2005|p=172}} Serbia's victory against Austria-Hungary in the 1914 invasion has been called one of the major upset victories of the twentieth century.{{Sfn|Schindler|2002|pp=159–195}} In 1915, the campaign saw the first use of [[anti-aircraft warfare]] after an Austrian plane was shot down with [[Surface-to-air missile|ground-to-air]] fire, as well as the first [[medical evacuation]] by the Serbian army.<ref>{{cite web |url=http://www.rts.rs/page/stories/sr/story/125/Dru%C5%A1tvo/1516279/Veliki+rat+-+avijacija.html |title=Veliki rat – Avijacija |publisher=RTS, Radio televizija Srbije, Radio Television of Serbia |website=rts.rs |access-date=16 July 2019 |archive-date=10 July 2017 |archive-url=https://web.archive.org/web/20170710083934/http://www.rts.rs/page/stories/sr/story/125/Dru%C5%A1tvo/1516279/Veliki+rat+-+avijacija.html |url-status=live }}</ref><ref>{{cite magazine| url=http://www.nationalgeographic.rs/vesti/3842-prvi-ratni-avion-oboren-u-istoriji-pao-na-kragujevac.html| title=How was the first military airplane shot down| magazine=National Geographic| access-date=5 August 2015| archive-url=https://web.archive.org/web/20150831011608/http://www.nationalgeographic.rs/vesti/3842-prvi-ratni-avion-oboren-u-istoriji-pao-na-kragujevac.html| archive-date=31 August 2015| url-status=live}}</ref>

==== German offensive in Belgium and France ====
{{Main|Great Retreat}}
[[File:German soldiers in a railroad car on the way to the front during early World War I, taken in 1914. Taken from greatwar.nl site.jpg|thumb|upright=1.0|German soldiers on the way to the front in 1914; at this stage, all sides expected the conflict to be a short one.]]

Upon mobilisation, in accordance with the [[Schlieffen Plan]], 80% of the [[German Army order of battle (1914)|German Army]] was located on the Western Front, with the remainder acting as a screening force in the East. Rather than a direct attack across their shared frontier, the German right wing would sweep through the [[Netherlands]] and [[Belgium]], then swing south, encircling Paris and trapping the French army against the Swiss border. The plan's creator, [[Alfred von Schlieffen]], head of the [[German General Staff]] from 1891 to 1906, estimated that this would take six weeks, after which the German army would transfer to the East and defeat the Russians.{{Sfn|Stevenson|2004|p=22}}

The plan was substantially modified by his successor, [[Helmuth von Moltke the Younger]]. Under Schlieffen, 85% of German forces in the west were assigned to the right wing, with the remainder holding along the frontier. By keeping his left-wing deliberately weak, he hoped to lure the French into an offensive into the "lost provinces" of [[Alsace-Lorraine]], which was the strategy envisaged by their [[Plan XVII]].{{Sfn|Stevenson|2004|p=22}} However, Moltke grew concerned that the French might push too hard on his left flank and as the German Army increased in size from 1908 to 1914, he changed the allocation of forces between the two wings to 70:30.{{Sfn|Horne|1964|p=22}} He also considered Dutch neutrality essential for German trade and cancelled the incursion into the Netherlands, which meant any delays in Belgium threatened the viability of the plan.{{Sfn|Stevenson|2004|p=23}} Historian [[Richard Holmes (military historian)|Richard Holmes]] argues that these changes meant the right wing was not strong enough to achieve decisive success.{{sfn|Holmes|2014 |pp=194, 211}}

[[File:Georges Scott, A la baïonnette !.jpg|thumb|right|upright=1.0|French bayonet charge during the [[Battle of the Frontiers]]; by the end of August, French casualties exceeded 260,000, including 75,000 dead.]]

The initial German advance in the West was very successful. By the end of August, the Allied left, which included the [[British Expeditionary Force (World War I)|British Expeditionary Force]] (BEF), was in [[Great Retreat|full retreat]], and the French offensive in Alsace-Lorraine was a disastrous failure, with casualties exceeding 260,000.{{sfn|Stevenson|2012|p=54}} German planning provided broad strategic instructions while allowing army commanders considerable freedom in carrying them out at the front, but [[Alexander von Kluck|von Kluck]] used this freedom to disobey orders, opening a gap between the German armies as they closed on Paris.{{Sfn|Jackson|2018|p=55}} The French army, reinforced by the British expeditionary corps, seized this opportunity to counter-attack and pushed the German army 40 to 80&nbsp;km back. Both armies were then so exhausted that no decisive move could be implemented, so they settled in trenches, with the vain hope of breaking through as soon as they could build local superiority.

In 1911, the Russian [[Stavka]] agreed with the French to attack Germany within fifteen days of mobilisation, ten days before the Germans had anticipated, although it meant the two Russian armies that entered [[East Prussia]] on 17 August did so without many of their support elements.{{Sfn |Lieven|2016|p=327}}

By the end of 1914, German troops held strong defensive positions inside France, controlled the bulk of France's domestic coalfields, and inflicted 230,000 more casualties than it lost itself. However, communications problems and questionable command decisions cost Germany the chance of a decisive outcome, while it had failed to achieve the primary objective of avoiding a long, two-front war.{{sfn|Tucker|Roberts|2005|pp=376–378}} As was apparent to several German leaders, this amounted to a strategic defeat; shortly after the [[First Battle of the Marne]], [[Wilhelm, German Crown Prince|Crown Prince Wilhelm]] told an American reporter "We have lost the war. It will go on for a long time but lost it is already."{{Sfn|Horne|1964|p=221}}

==== Asia and the Pacific ====
{{Main|Asian and Pacific theatre of World War I}}
[[File:Siege of Tsingtao, soldiers of IJA 18th division took over german trench Kopie.jpg|thumb|right|Japanese soldiers occupy an abandoned German trench during the [[Siege of Tsingtao]], 1914]]

On 30 August 1914, New Zealand [[Occupation of German Samoa|occupied German Samoa]] (now [[Samoa]]). On 11 September, the [[Australian Naval and Military Expeditionary Force]] landed on the island of [[New Britain]], then part of [[German New Guinea]]. On 28 October, the German cruiser {{SMS |Emden}} sank the [[Russian cruiser Zhemchug|Russian cruiser ''Zhemchug'']] in the [[Battle of Penang]]. Japan declared war on Germany before seizing territories in the Pacific, which later became the [[South Seas Mandate]], as well as German [[Treaty ports]] on the Chinese [[Shandong]] peninsula at [[Siege of Tsingtao|Tsingtao]]. After Vienna refused to withdraw its cruiser {{SMS |Kaiserin Elisabeth}} from Tsingtao, Japan declared war on Austria-Hungary, and the ship was sunk in November 1914.{{Sfn|Donko|2012|p=79}} Within a few months, Allied forces had seized all German territories in the Pacific, leaving only isolated commerce raiders and a few holdouts in New Guinea.{{sfn |Keegan |1998 |pp=224–232}}{{sfn |Falls |1960 |pp=79–80}}

==== African campaigns ====
{{Main|African theatre of World War I}}

Some of the first clashes of the war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorates of [[Togoland]] and [[Kamerun]]. On 10 August, German forces in [[German South West Africa|South-West Africa]] attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in [[German East Africa]], led by Colonel [[Paul von Lettow-Vorbeck]], fought a [[guerrilla warfare]] campaign and only surrendered two weeks after the armistice took effect in Europe.{{sfn |Farwell |1989 |p=353}}

==== Indian support for the Allies ====
{{Main|Indian Army during World War I}}
{{Further|Hindu–German Conspiracy|Niedermayer–Hentig Expedition|Third Anglo-Afghan War}}
[[File:Indian forces on their way to the Front in Flanders - first world war 2.jpg|thumb|right|[[British Indian Army]] infantry divisions in France; these troops were withdrawn in December 1915, and served in the [[Mesopotamian campaign]].]]

Before the war, Germany had attempted to use Indian nationalism and pan-Islamism to its advantage, a policy continued post-1914 by [[Hindu–German Conspiracy|instigating uprisings in India]], while the [[Niedermayer–Hentig Expedition]] urged Afghanistan to join the war on the side of Central Powers. However, contrary to British fears of a revolt in India, the outbreak of the war saw a reduction in nationalist activity.{{sfn |Brown |1994 |pp=197–198}}{{sfn |Brown |1994 |pp=201–203}} Leaders from the [[Indian National Congress]] and other groups believed support for the British war effort would hasten [[Indian Home Rule movement|Indian Home Rule]], a promise allegedly made explicit in 1917 by [[Edwin Montagu]], the [[Secretary of State for India]].<ref>{{cite web |last1=Kant |first1=Vedica |title=India and WWI: Piecing together the impact of the Great War on the subcontinent |url=https://blogs.lse.ac.uk/southasia/2014/09/24/piecing-together-the-impact-of-the-great-war-on-india/ |website=LSE |date=24 September 2014 |access-date=28 September 2022 |archive-date=28 September 2022 |archive-url=https://web.archive.org/web/20220928184956/https://blogs.lse.ac.uk/southasia/2014/09/24/piecing-together-the-impact-of-the-great-war-on-india/ |url-status=live }}</ref>

In 1914, the [[British Indian Army]] was larger than the British Army itself, and between 1914 and 1918 an estimated 1.3&nbsp;million Indian soldiers and labourers served in Europe, Africa, and the Middle East. In all, 140,000&nbsp;soldiers served on the Western Front and nearly 700,000 in the Middle East, with 47,746 killed and 65,126 wounded.<ref>{{cite web |url=http://www.mgtrust.org/ind1.htm |title=Participants from the Indian subcontinent in the First World War |publisher=Memorial Gates Trust |access-date=12 December 2008 |archive-date=1 July 2019 |archive-url=https://web.archive.org/web/20190701062212/http://www.mgtrust.org/ind1.htm |url-status=live }}</ref> The suffering engendered by the war, as well as the failure of the British government to grant self-government to India afterward, bred disillusionment, resulting in [[Indian independence movement|the campaign for full independence]] led by [[Mahatma Gandhi]].<ref>{{cite book |last=Horniman |first=Benjamin Guy | author-link = B. G. Horniman |title=British administration and the Amritsar massacre |publisher=Mittal Publications |date=1984 |page=45}}</ref>

=== Western Front 1914 to 1916 ===
{{Main|Western Front (World War I)}}

==== Trench warfare begins ====
[[File:Indian infantry digging trenches Fauquissart, France (Photo 24-299).jpg|thumb|[[Indian Army during World War I|British Indian soldiers]] digging trenches in [[Laventie]], France, 1915]]
Pre-war military tactics that had emphasised open warfare and individual riflemen proved obsolete when confronted with conditions prevailing in 1914. Technological advances allowed the creation of strong defensive systems largely impervious to massed infantry advances, such as [[barbed wire]], machine guns and above all far more powerful [[artillery]], which dominated the battlefield and made crossing open ground extremely difficult.{{sfn|Raudzens|1990|p=424}} Both sides struggled to develop tactics for breaching entrenched positions without heavy casualties. In time, technology enabled the production of new offensive weapons, such as [[Chemical weapons in World War I|gas warfare]] and the [[Tanks in World War I|tank]].{{sfn |Raudzens |1990 |pp=421–423}}

After the [[First Battle of the Marne]] in September 1914, Allied and German forces unsuccessfully tried to outflank each other, a series of manoeuvres later known as the "[[Race to the Sea]]". By the end of 1914, the opposing forces confronted each other along an uninterrupted line of entrenched positions from the [[English Channel|Channel]] to the Swiss border.{{Sfn|Gilbert|1994|p=99}} Since the Germans were normally able to choose where to stand, they generally held the high ground, while their trenches tended to be better built; those constructed by the French and English were initially considered "temporary", only needed until an offensive would destroy the German defences.{{sfn|Goodspeed|1985|p=199}} Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the [[Second Battle of Ypres]], the Germans (violating the [[Hague Conventions of 1899 and 1907|Hague Convention]]) used [[chlorine]] gas for the first time on the Western Front. Several types of gas soon became widely used by both sides and though it never proved a decisive, battle-winning weapon, it became one of the most feared and best-remembered horrors of the war.<ref>{{cite web |first=Michael |last=Duffy |url=http://www.firstworldwar.com/weaponry/gas.htm |title=Weapons of War: Poison Gas |publisher=Firstworldwar.com |date=22 August 2009 |access-date=5 July 2012 |archive-date=21 August 2007 |archive-url=https://web.archive.org/web/20070821004525/http://www.firstworldwar.com/weaponry/gas.htm |url-status=live }}</ref>{{sfn |Love |1996}}

==== Continuation of trench warfare ====
[[File:The Battle of the Somme, July-november 1916 Q4218.jpg|thumb|right|upright=1.0|German casualties at the Somme, 1916]]

In February 1916, the Germans attacked French defensive positions at the [[Battle of Verdun]], lasting until December 1916. Casualties were greater for the French, but the Germans bled heavily as well, with anywhere from 700,000{{sfn |Dupuy |1993 |p=1042}} to 975,000{{sfn |Grant |2005 |p=276}} casualties between the two combatants. Verdun became a symbol of French determination and self-sacrifice.<ref>{{Cite news |url=https://www.independent.co.uk/news/world/europe/verdun-myths-and-memories-of-the-lost-villages-of-france-5335493.html |title=Verdun: myths and memories of the 'lost villages' of France |last=Lichfield |first=John |date=21 February 2006 |work=The Independent |access-date=23 July 2013 |archive-date=22 October 2017 |archive-url=https://web.archive.org/web/20171022235418/http://www.independent.co.uk/news/world/europe/verdun-myths-and-memories-of-the-lost-villages-of-france-5335493.html |url-status=live }}</ref>

The [[Battle of the Somme]] was an Anglo-French offensive from July to November 1916. The [[first day on the Somme|opening day]] on 1 July 1916 was the bloodiest single day in the history of the [[British Army]], which suffered 57,500 casualties, including 19,200 dead. As a whole, the Somme offensive led to an estimated 420,000 British casualties, along with 200,000 French and 500,000 Germans.{{sfn |Harris |2008 |p=271}} The diseases that emerged in the trenches were a major killer on both sides. The living conditions led to disease and infection, such as [[trench foot]], [[louse|lice]], [[typhus]], [[trench fever]], and the '[[Spanish flu]]'.<ref>{{cite journal |last1=Chorba |first1=Terence |title=Trench Conflict with Combatants and Infectious Disease |journal=Emerging Infectious Diseases |url=https://doi.org/10.3201/eid2411.AC2411 |publisher=CDC |access-date=29 February 2024 |pages=2136–2137 |language=en-us |doi=10.3201/eid2411.ac2411 |date=November 2018 |volume=24 |issue=11 |archive-date=10 June 2024 |archive-url=https://web.archive.org/web/20240610092106/https://wwwnc.cdc.gov/eid/article/24/11/AC-2411_article |url-status=live |issn=1080-6040 }}</ref>

=== Naval war ===
{{Main|Naval warfare of World War I}}
[[File:Hochseeflotte 2.jpg|thumb|upright=1.0|Battleships of the [[High Seas Fleet|''Hochseeflotte'']], 1917]]

At the start of the war, German [[cruiser]]s were scattered across the globe, some of which were subsequently used to attack Allied [[merchant shipping]]. These were systematically hunted down by the Royal Navy, though not before causing considerable damage. One of the most successful was the {{SMS|Emden}}, part of the German [[East Asia Squadron]] stationed at [[Qingdao]], which seized or sank 15 merchantmen, a Russian cruiser and a French destroyer. Most of the squadron was returning to Germany when it sank two British armoured cruisers at the [[Battle of Coronel]] in November 1914, before being virtually destroyed at the [[Battle of the Falkland Islands]] in December. The [[SMS Dresden (1907)|SMS ''Dresden'']] escaped with a few auxiliaries, but after the [[Battle of Más a Tierra]], these too were either destroyed or interned.{{sfn |Taylor |2007 |pp=39–47}}

Soon after the outbreak of hostilities, Britain began a naval [[Blockade of Germany (1914–1919)|blockade of Germany]]. This proved effective in cutting off vital supplies, though it violated accepted international law.{{sfn|Keene |2006 |p=5}} Britain also mined international waters which closed off entire sections of the ocean, even to neutral ships.{{sfn|Halpern |1995 |p=293}} Since there was limited response to this tactic, Germany expected a similar response to its unrestricted submarine warfare.{{sfn|Zieger |2001 |p=50}}

The [[Battle of Jutland]]{{efn|German: ''Skagerrakschlacht'', or "Battle of the [[Skagerrak]]"}} in May/June 1916 was the only full-scale clash of battleships during the war, and one of the largest in history. The clash was indecisive, though the Germans inflicted more damage than they received; thereafter the bulk of the German [[High Seas Fleet]] was confined to port.<ref>{{cite journal |author= Jeremy Black | author-link = Jeremy Black (historian) |title=Jutland's Place in History |journal=Naval History |date=June 2016 |volume=30 |issue=3 |pages=16–21}}</ref>

[[File:NationaalArchief uboat155London.jpg|thumb|upright=1.0|[[German submarine Deutschland|''U-155'']] exhibited near Tower Bridge in London, after the 1918 Armistice|left]]
German [[U-boat]]s attempted to cut the supply lines between North America and Britain.<ref name="Sheffield">{{cite web |last=Sheffield |first=Garry | author-link = Gary Sheffield (historian) |title=The First Battle of the Atlantic |website=World Wars in Depth |url=http://www.bbc.co.uk/history/worldwars/wwone/battle_atlantic_ww1_01.shtml |publisher=BBC |access-date=11 November 2009 |archive-date=3 June 2019 |archive-url=https://web.archive.org/web/20190603135501/http://www.bbc.co.uk/history/worldwars/wwone/battle_atlantic_ww1_01.shtml |url-status=live }}</ref> The nature of [[submarine warfare]] meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival.<ref name="Sheffield" />{{sfn|Gilbert |1994 |p=306}} The United States launched a protest, and Germany changed its rules of engagement. After [[Sinking of the RMS Lusitania|the sinking]] of the passenger ship [[RMS Lusitania|RMS ''Lusitania'']] in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond the protection of the "[[Prize (law)|cruiser rules]]", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet).{{sfn |von der Porten |1969}} Finally, in early 1917, Germany adopted a policy of [[unrestricted submarine warfare]], realising the Americans would eventually enter the war.<ref name="Sheffield" />{{sfn|Jones |2001 |p=80}} Germany sought to strangle Allied [[sea lane]]s before the United States could transport a large army overseas, but, after initial successes, eventually failed to do so.<ref name="Sheffield" />

The U-boat threat lessened in 1917, when merchant ships began travelling in [[Convoys in World War I|convoys]], escorted by [[destroyer]]s. This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after the [[hydrophone]] and [[depth charge]]s were introduced, destroyers could potentially successfully attack a submerged submarine. Convoys slowed the flow of supplies since ships had to wait as convoys were assembled; the solution was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys.<ref>{{cite web |url=http://nslegislature.ca/index.php/committees/committee_hansard/C11/va_2006nov09 |title=Committee Hansard |date=9 November 2006 |author=((Nova Scotia House of Assembly Committee on Veterans Affairs)) |access-date=12 March 2013 |website=Hansard |archive-date=23 November 2011 |archive-url=https://web.archive.org/web/20111123113612/http://nslegislature.ca/index.php/committees/committee_hansard/C11/va_2006nov09 |url-status=live }}</ref> The U-boats sunk more than 5,000 Allied ships, at the cost of 199 submarines.<ref>{{cite book |first1=Roger |last1=Chickering |author1-link=Roger Chickering |first2=Stig |last2=Förster |first3=Bernd |last3=Greiner |series=Publications of the German Historical Institute |location=Washington, DC |year=2005 |url=https://books.google.com/books?id=evVPoSwqrG4C&pg=PA73 |title=A world at total war: global conflict and the politics of destruction, 1937–1945 |publisher=[[Cambridge University Press]] |isbn=978-0-521-83432-2 |access-date=12 November 2018 |archive-date=17 February 2024 |archive-url=https://web.archive.org/web/20240217083931/https://books.google.com/books?id=evVPoSwqrG4C&pg=PA73#v=onepage&q&f=false |url-status=live }}</ref>

World War I also saw the first use of [[aircraft carrier]]s in combat, with {{HMS |Furious |47 |6}} launching [[Sopwith Camel]]s in a successful raid against the [[Zeppelin]] hangars at [[Tondern raid|Tondern]] in July 1918, as well as [[blimp]]s for antisubmarine patrol.<ref name="price1980">{{harvnb |Price |1980}}</ref>

=== Southern theatres ===

==== War in the Balkans ====
{{Main|Balkans theatre|Bulgaria during World War I|Serbian campaign|Macedonian front}}
[[File:Flüchtlingstransport Leibnitz - k.k. Innenministerium - 1914.jpg|thumb|left|upright=.9|Refugee transport from Serbia in [[Leibnitz]], [[Styria]], 1914]]

Faced with Russia in the east, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses, the Austrians briefly occupied the Serbian capital, [[Belgrade]]. A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first 10 months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats scored a coup by persuading Bulgaria to join the attack on Serbia.{{sfn|Tucker|Roberts|2005|p=[{{google books |plainurl=y |id=2YqjfHLyyj8C |pp=241}} 241–]}} The Austro-Hungarian provinces of [[Slovenia]], Croatia and [[Bosnia (region)|Bosnia]] provided troops for Austria-Hungary. Montenegro allied itself with Serbia.{{sfn |Neiberg |2005 |pp=54–55}}

[[File:Bulgaria southern front.jpg|thumb|upright=.9|left|Bulgarian soldiers in a trench, preparing to fire against an incoming aeroplane]]
Bulgaria declared war on Serbia on 14 October 1915 and joined in the attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops in total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern [[Principality of Albania|Albania]]. The Serbs suffered defeat in the [[Kosovo offensive (1915)|Battle of Kosovo]]. Montenegro covered the Serbian retreat toward the Adriatic coast in the [[Battle of Mojkovac]] on 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated to Greece.{{sfn |Tucker |Roberts |2005 |pp=1075–1076}} After the conquest, Serbia was divided between Austro-Hungary and Bulgaria.{{sfn|DiNardo|2015|p=102}}

In late 1915, a Franco-British force landed at [[Thessaloniki|Salonica]] in Greece to offer assistance and to pressure its government to declare war against the Central Powers. However, the pro-German [[Constantine I of Greece|King Constantine I]] dismissed the pro-Allied government of [[Eleftherios Venizelos]] before the Allied expeditionary force arrived.{{sfn |Neiberg |2005 |pp=108–110}}

The Macedonian front was at first mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing [[Bitola]] on 19 November 1916 following the costly [[Monastir offensive]], which brought stabilisation of the front.<ref>{{cite book |last=Hall |first=Richard |title=Balkan Breakthrough: The Battle of Dobro Pole 1918 |year=2010 |publisher=Indiana University Press |page=11 |isbn=978-0-253-35452-5}}</ref>

[[File:Austrians executing Serbs 1917.JPG|thumb|Austro-Hungarian troops executing captured Serbians, 1917. [[Kingdom of Serbia|Serbia]] lost about 850,000 people during the war, a quarter of its pre-war population.<ref>"[https://archive.org/stream/PAM550-99/PAM550-99_djvu.txt The Balkan Wars and World War I]". p. 28. ''[[Library of Congress Country Studies]]''.</ref>]]
Serbian and French troops finally made a breakthrough in September 1918 in the [[Vardar offensive]], after most German and Austro-Hungarian troops had been withdrawn. The Bulgarians were defeated at the [[Battle of Dobro Pole]], and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed. Bulgaria capitulated four days later, on 29 September 1918.{{sfn |Tucker |Wood |Murphy |1999 |pp=150–152}} The German high command responded by despatching troops to hold the line, but these forces were too weak to re-establish a front.<ref name=militera>{{cite web |url=http://militera.lib.ru/h/korsun_ng4/06.html |title=The Balkan Front of the World War |language=ru |first=N. |last=Korsun |publisher=militera.lib.ru |access-date=27 September 2010 |archive-date=9 August 2013 |archive-url=https://web.archive.org/web/20130809073504/http://militera.lib.ru/h/korsun_ng4/06.html |url-status=live }}</ref>

The disappearance of the Macedonian front meant that the road to [[Budapest]] and Vienna was now opened to Allied forces. Hindenburg and Ludendorff concluded that the strategic and operational balance had now shifted decidedly against the [[Central Powers]] and, a day after the Bulgarian collapse, insisted on an immediate peace settlement.{{sfn|Doughty |2005 |p=491}}

==== Ottoman Empire ====
{{Main|Ottoman Empire in World War I}}
{{See also|Middle Eastern theatre of World War I}}
[[File:Scene just before the evacuation at Anzac. Australian troops charging near a Turkish trench. When they got there the... - NARA - 533108.jpg|thumb|left|Australian troops charging near a Turkish trench during the [[Gallipoli campaign]]]]

The Ottomans threatened Russia's [[Caucasus|Caucasian]] territories and Britain's communications with India via the [[Suez Canal]]. The Ottoman Empire took advantage of the European powers' preoccupation with the war and conducted large-scale ethnic cleansing of the [[Armenians|Armenian]], [[Greeks|Greek]], and [[Assyrian people|Assyrian]] Christian populations&mdash;the [[Armenian genocide]], [[Greek genocide]], and [[Sayfo]] respectively.<ref>{{cite book |editor1-last=Gettleman |editor1-first=Marvin | editor1-link = Marvin Gettleman |editor2-last=Schaar |editor2-first=Stuart |title=The Middle East and Islamic world reader |date=2003 |publisher=Grove Press |location=New York |isbn=978-0-8021-3936-8 |pages=119–120 |edition=4th |url={{google books |plainurl=y |id=srLGT3dwTogC}}}}</ref><ref>{{cite book |last1=January |first1=Brendan |title=Genocide: modern crimes against humanity |date=2007 |publisher=Twenty-First Century Books |location=Minneapolis, Minn. |isbn=978-0-7613-3421-7 |page=14 |url={{google books |plainurl=y |id=IoPMDp2WA6cC}}}}</ref><ref name=lieberman>{{cite book |last1=Lieberman |first1=Benjamin |title=The Holocaust and Genocides in Europe |date=2013 |publisher=Continuum Publishing Corporation |location=New York |isbn=978-1-4411-9478-7 |pages=80–81 |url={{google books |plainurl=y |id=ySFMAQAAQBAJ}}}}</ref>

The British and French opened overseas fronts with the [[Gallipoli campaign|Gallipoli]] (1915) and [[Mesopotamian campaign]]s (1914). In Gallipoli, the Ottoman Empire successfully repelled the British, French, and [[Australian and New Zealand Army Corps]] (ANZACs). In [[Mesopotamia]], by contrast, after the defeat of the British defenders in the [[siege of Kut]] by the Ottomans (1915–1916), British Imperial forces reorganised and captured [[Baghdad]] in March 1917. The British were aided in Mesopotamia by local Arab and Assyrian fighters, while the Ottomans employed local [[Kurds|Kurdish]] and [[Iraqi Turkmen|Turcoman]] tribes.<ref>Arthur J. Barker, ''The Neglected War: Mesopotamia, 1914–1918'' (London: Faber, 1967)</ref>

The [[Suez Canal]] was defended from Ottoman attacks in 1915 and 1916; in August 1916, a German and Ottoman force was defeated at the [[Battle of Romani]] by the [[ANZAC Mounted Division]] and the [[52nd (Lowland) Infantry Division]]. Following this victory, an [[Egyptian Expeditionary Force]] advanced across the [[Sinai Peninsula]], pushing Ottoman forces back in the [[Battle of Magdhaba]] in December and the [[Battle of Rafa]] on the border between the Egyptian [[Sinai Peninsula|Sinai]] and Ottoman Palestine in January 1917.<ref>{{cite book |first1=John |last1=Crawford |first2=Ian |last2=McGibbon |title=New Zealand's Great War: New Zealand, the Allies and the First World War |url={{google books |plainurl=y |id=mtEEuD_-2SMC |page=219}} |year=2007 |publisher=Exisle Publishing |pages=219–220}}</ref>

[[File:Sarikam.jpg|thumb|Russian forest trench at the [[Battle of Sarikamish]], 1914–1915]]
Russian armies generally had success in the [[Caucasus campaign]]. [[Enver Pasha]], supreme commander of the Ottoman armed forces, dreamed of re-conquering central Asia and areas that had been previously lost to Russia. He was, however, a poor commander.{{sfn|Fromkin |2004 |p=119}} He launched an offensive against the Russians in the Caucasus in December 1914 with 100,000 troops, insisting on a frontal attack against mountainous Russian positions in winter. He lost 86% of his force at the [[Battle of Sarikamish]].<ref name=caven>{{harvnb |Hinterhoff |1984 |pp=499–503}}</ref> General [[Nikolai Yudenich|Yudenich]], the Russian commander from 1915 to 1916, drove the Turks out of most of the southern [[Caucasus]].<ref name=caven />

[[File:Ottoman 15th Corps.jpg|thumb|right|Kaiser Wilhelm II and [[Prince Leopold of Bavaria]] inspecting Turkish troops of the 15th Corps in East Galicia, Austria-Hungary (now Poland).]]

The Ottoman Empire, with German support, invaded Persia (modern [[Iran]]) in December 1914 to cut off British and Russian access to [[petroleum reservoir]]s around [[Baku]].<ref>The Encyclopedia Americana, 1920, v. 28, p. 403</ref> Persia, ostensibly neutral, had long been under British and Russian influence. The Ottomans and Germans were aided by [[Kurds|Kurdish]] and [[Azerbaijanis|Azeri]] forces, together with a large number of major Iranian tribes, while the Russians and British had the support of Armenian and Assyrian forces. The [[Persian campaign (World War I)|Persian campaign]] lasted until 1918 and ended in failure for the Ottomans and their allies. However, the Russian withdrawal from the war in 1917 led Armenian and Assyrian forces to be cut off from supply lines, outnumbered, outgunned and isolated, forcing them to fight and flee towards British lines in northern Mesopotamia.<ref>{{cite news |first=Dudley S. |last=Northcote |title=Saving Forty Thousand Armenians |url=https://books.google.com/books?id=4LYqAAAAYAAJ |work=Current History |publisher=New York Times Co. |year=1922 |access-date=9 September 2021 |archive-date=9 September 2021 |archive-url=https://web.archive.org/web/20210909113528/https://books.google.com/books?id=4LYqAAAAYAAJ |url-status=live }}</ref>

The [[Arab Revolt]], instigated by the British [[Foreign, Commonwealth and Development Office|Foreign Office]], started in June 1916 with the [[Battle of Mecca (1916)|Battle of Mecca]], led by [[Hussein bin Ali, Sharif of Mecca|Sharif Hussein]]. The Sharif declared the independence of the [[Kingdom of Hejaz]] and, with British assistance, conquered much of Ottoman-held Arabia, resulting finally in the Ottoman surrender of Damascus. [[Fakhri Pasha]], the Ottoman commander of [[Medina]], resisted for more than {{frac|2|1|2}} years during the [[siege of Medina]] before surrendering in January 1919.{{sfn |Sachar |1970 |pp=122–138}}

The [[Senusiyya|Senussi]] tribe, along the border of [[Italian Libya]] and [[British Egypt]], incited and armed by the Turks, waged a small-scale [[Guerrilla warfare|guerrilla war]] against Allied troops. The British were forced to dispatch 12,000 troops to oppose them in the [[Senussi campaign]]. Their rebellion was finally crushed in mid-1916.{{sfn |Gilbert |1994}}

Total Allied casualties on the Ottoman fronts amounted to 650,000 men. Total Ottoman casualties were 725,000, with 325,000 dead and 400,000 wounded.<ref name="Brief Ottoman History">{{cite book |last=Hanioglu |first=M. Sukru | author-link = M. Şükrü Hanioğlu |title=A Brief History of the Late Ottoman Empire |publisher=Princeton University Press |year=2010 |pages=180–181 |isbn=978-0-691-13452-9}}</ref>

==== Italian Front ====
{{Main|Italian front (World War I)|White War|Military history of Italy during World War I}}
[[File:Italian Front 1915-1917.jpg|thumb|left|upright=1.0|[[Battles of the Isonzo|Isonzo Offensives 1915–1917]]]]

Though Italy joined the Triple Alliance in 1882, a treaty with its traditional Austrian enemy was so controversial that subsequent governments denied its existence and the terms were only made public in 1915.{{Sfn|Thompson|2009|p=13}} This arose from [[Italian nationalism|nationalist]] designs on Austro-Hungarian territory in [[Trentino]], the [[Austrian Littoral]], [[Rijeka]] and [[Dalmatia]], considered vital to secure the borders established in [[Third Italian War of Independence|1866]].{{Sfn|Thompson|2009|pp=9–10}} In 1902, Rome secretly had agreed with France to remain neutral if the latter was attacked by Germany, effectively nullifying its role in the Triple Alliance.{{Sfn|Gardner|2015|p=120}}

When the war began in 1914, Italy argued the Triple Alliance was defensive and it was not obliged to support an Austrian attack on Serbia. Opposition to joining the Central Powers increased when Turkey became a member in September, since in [[Italo-Turkish War|1911]] Italy had occupied Ottoman possessions in [[Italian Libya|Libya]] and the [[Dodecanese]] islands.{{Sfn|Thompson|2009|p=14}} To secure Italian neutrality, the Central Powers offered them [[French protectorate of Tunisia|Tunisia]], while in return for an immediate entry into the war, the Allies agreed to their demands for Austrian territory and sovereignty over the Dodecanese.{{Sfn|Thompson|2009|pp=30–31}} Although they remained secret, these provisions were incorporated into the April 1915 [[Treaty of London (1915)|Treaty of London]]; Italy joined the Triple Entente and, on 23 May, declared war on Austria-Hungary,{{Sfn|Gilbert|1994|p=166}} followed by Germany fifteen months later.[[File:1917 ortler vorgipfelstellung 3850 m highest trench in history of first world war.jpg|thumb|right|Austro-Hungarian trench at 3,850 metres in the [[Ortler Alps]], one of the most challenging fronts of the war]]

The pre-1914 Italian army was short of officers, trained men, adequate transport and modern weapons; by April 1915, some of these deficiencies had been remedied but it was still unprepared for the major offensive required by the Treaty of London.{{Sfn|Thompson|2009|p=57}} The advantage of superior numbers was offset by the difficult terrain; much of the fighting took place high in the [[Alps]] and [[Dolomites]], where trench lines had to be cut through rock and ice and keeping troops supplied was a major challenge. These issues were exacerbated by unimaginative strategies and tactics.{{Sfn|Marshall|Josephy|1982|p=108}} Between 1915 and 1917, the Italian commander, [[Luigi Cadorna]], undertook [[Battles of the Isonzo|a series of frontal assaults along the Isonzo]], which made little progress and cost many lives; by the end of the war, Italian combat deaths totalled around 548,000.{{Sfn|Fornassin|2017|pp=39–62}}

In the spring of 1916, the Austro-Hungarians counterattacked in [[Asiago]] in the ''[[Battle of Asiago|Strafexpedition]]'', but made little progress and were pushed by the Italians back to Tyrol.{{sfn|Thompson|2009|p=163}} Although Italy occupied southern [[Albania during World War I|Albania]] in May 1916, their main focus was the Isonzo front which, after the [[Battle of Doberdò|capture of Gorizia]] in August 1916, remained static until October 1917. After a combined Austro-German force won a major victory at [[Battle of Caporetto|Caporetto]], Cadorna was replaced by [[Armando Diaz]] who retreated more than {{convert|100|km|mi}} before holding positions along the [[Second Battle of the Piave River|Piave River]].{{Sfn|Gilbert|1994|p=317}} A second Austrian [[Second Battle of the Piave River|offensive was repulsed]] in June 1918. On 24 October, Diaz launched the [[Battle of Vittorio Veneto]] and initially met stubborn resistance,{{Sfn|Gilbert|1994|p=482}} but with Austria-Hungary collapsing, Hungarian divisions in Italy demanded they be sent home.{{Sfn|Gilbert|1994|p=484}} When this was granted, many others followed and the Imperial army disintegrated, the Italians taking over 300,000 prisoners.{{Sfn|Thompson|2009|p=364}} On 3{{nbsp}}November, the [[Armistice of Villa Giusti]] ended hostilities between Austria-Hungary and Italy which occupied [[Trieste]] and areas along the [[Adriatic Sea]] awarded to it in 1915.{{Sfn|Gilbert|1994|p=491}}

=== Eastern Front ===
{{Main|Eastern Front (World War I)}}

==== Initial actions ====
[[File:Mikolaj II w Twierdzy Przemysl.jpg|thumb|right|upright=1.0|Emperor [[Nicholas II of Russia|Nicholas II]] and [[Grand Duke Nicholas Nikolaevich of Russia (1856–1929)|Grand Duke Nikolaevich]] following the Russian [[siege of Przemyśl|capture of Przemyśl]], the longest siege of the war.]]

As previously agreed with French president [[Raymond Poincaré]], Russian plans at the start of the war were to simultaneously advance into [[Kingdom of Galicia and Lodomeria|Austrian Galicia]] and East Prussia as soon as possible. Although their [[Battle of Galicia|attack on Galicia]] was largely successful, and the invasions achieved their aim of forcing Germany to divert troops from the Western Front, the speed of mobilisation meant they did so without much of their heavy equipment and support functions. These weaknesses contributed to Russian defeats at [[Battle of Tannenberg|Tannenberg]] and the [[First Battle of the Masurian Lakes|Masurian Lakes]] in August and September 1914, forcing them to withdraw from East Prussia with heavy losses.{{sfn|Tucker|Roberts|2005|p=715}}{{sfn|Meyer|2006|pp=152–154, 161, 163, 175, 182}} By spring 1915, they had also retreated from Galicia, and the May 1915 [[Gorlice–Tarnów offensive]] allowed the Central Powers to invade [[Congress Poland|Russian-occupied Poland]].<ref name="Smele">{{harvnb |Smele}}</ref>

Despite the successful June 1916 [[Brusilov offensive]] against the Austrians in eastern Galicia,{{sfn|Schindler|2003|p=?}} shortages of supplies, heavy losses and command failures prevented the Russians from fully exploiting their victory. However, it was one of the most significant offensives of the war, diverting German resources from [[Battle of Verdun|Verdun]], relieving Austro-Hungarian pressure on the Italians, and convincing Romania to enter the war on the side of the Allies on 27 August. It also fatally weakened both the Austrian and Russian armies, whose offensive capabilities were badly affected by their losses and increased disillusion with the war that ultimately led to the Russian revolutions.{{Sfn|Tucker|2002|p=119}}

Meanwhile, unrest grew in Russia as [[Nicholas II of Russia|the Tsar]] remained at the front, with the home front controlled by [[Alexandra Feodorovna (Alix of Hesse)|Empress Alexandra]]. Her increasingly incompetent rule and food shortages in urban areas led to widespread protests and the murder of her favourite, [[Grigori Rasputin]], at the end of 1916.<ref>{{cite book|title=Cultural Studies|author=Lawrence Goodrich|url=https://books.google.com/books?id=wErHyRve0noC&pg=PA376|year=2011|page=376|publisher=[[Jones & Bartlett Learning]]|isbn=9781449637286|access-date=30 July 2023|archive-date=20 August 2023|archive-url=https://web.archive.org/web/20230820043510/https://books.google.com/books?id=wErHyRve0noC&pg=PA376|url-status=live}}</ref>

==== Romanian participation ====
{{Main|Romania in World War I}}
{{Location map many|Romania|caption = Romania key locations 1916–1918 (note; using 2022 borders)|border = black|relief=yes|width =250|float = left|
|label   = Bucharest          |pos = left |lat_deg   =44.4325|lon_deg   = 26.103889
|label2  = Timișoara (Banat)  |pos2 = right   |lat2_deg  =45.759722|lon2_deg  = 21.23
|label4  = Cluj (Transylvania)|pos4 = top  |lat4_deg  =46.766667|lon4_deg  = 23.583333
|label5  = Chișinău (Moldova) |pos5 = top|lat5_deg  =47.022778|lon5_deg  = 28.835278
|label6  = Constanța (Dobruja)|pos6 = top   |lat6_deg  =44.166667|lon6_deg  = 28.633333
|label7  = Bulgaria           |pos7 = bottom |lat7_deg  =43.9|lon7_deg = 27.0
|label8  = Hungary            |pos8 = right |lat8_deg  =47.755|lon8_deg = 20.5
|label9  = Mărășești          |pos9 = right |lat9_deg  =45.88|lon9_deg = 27.23
|label10 = Oituz              |pos10 = left |lat10_deg =46.2|lon10_deg = 26.616667}}

Despite secretly agreeing to support the Triple Alliance in 1883, Romania increasingly found itself at odds with the Central Powers over their support for Bulgaria in the Balkan Wars and the status of ethnic Romanian communities in [[Kingdom of Hungary|Hungarian]]-controlled [[Transylvania]],{{Sfn|Jelavich|1992|pp=441–442}} which comprised an estimated 2.8&nbsp;million of the 5.0&nbsp;million population.{{Sfn|Dumitru|2012|p=171}} With the ruling elite split into pro-German and pro-Entente factions,{{Sfn|Dumitru|2012|p=170}} Romania remained neutral for two years while allowing Germany and Austria to transport military supplies and advisors across Romanian territory.{{Sfn|Gilbert|1994|p=282}}

In September 1914, Russia acknowledged Romanian rights to Austro-Hungarian territories including Transylvania and [[Banat]], whose acquisition had widespread popular support,{{Sfn|Dumitru|2012|p=171}} and Russian success against Austria led Romania to join the Entente in the August 1916 [[Treaty of Bucharest (1916)|Treaty of Bucharest]].{{Sfn|Gilbert|1994|p=282}} Under the strategic plan known as [[Hypothesis Z]], the Romanian army planned an offensive into Transylvania, while defending Southern [[Dobruja]] and [[Giurgiu County|Giurgiu]] against a possible Bulgarian counterattack.{{Sfn|Torrie|1978|pp=7–8}} On 27 August 1916, they [[Battle of Transylvania|attacked Transylvania]] and occupied substantial parts of the province before being driven back by the recently formed [[9th Army (German Empire)|German 9th Army]], led by former Chief of Staff [[Erich von Falkenhayn]].{{Sfn|Barrett|2013|pp=96–98}} A combined German-Bulgarian-Turkish offensive captured Dobruja and Giurgiu, although the bulk of the Romanian army managed to escape encirclement and retreated to [[Bucharest]], which [[Battle of Bucharest|surrendered]] to the Central Powers on 6 December 1916.<ref>România în anii primului război mondial, vol.2, p. 831</ref>

In the summer of 1917, a Central Powers offensive began in Romania under the command of August von Mackensen to knock Romania out of the war, resulting in the battles of [[Third Battle of Oituz|Oituz]], [[Battle of Mărăști|Mărăști]] and [[Battle of Mărășești|Mărășești]] where up to 1,000,000 Central Powers troops were present. The battles lasted from 22 July to 3 September and eventually, the Romanian army was victorious advancing 500&nbsp;km<sup>2</sup>. August von Mackensen could not plan for another offensive as he had to transfer troops to the Italian Front.<ref>Keith Hitchins, Clarendon Press, 1994, Rumania 1866–1947, p. 269</ref> Following the Russian revolution, Romania found itself alone on the Eastern Front and signed the [[Treaty of Bucharest (1918)|Treaty of Bucharest]] with the Central Powers, which recognised Romanian sovereignty over [[Bessarabia]] in return for ceding control of passes in the Carpathian Mountains to Austria-Hungary and leasing its oil wells to Germany. Although approved by [[Parliament of Romania|Parliament]], [[Ferdinand I of Romania|King Ferdinand I]] refused to sign it, hoping for an Allied victory in the west.{{Sfn|Crampton|1994|pp=24–25}} Romania re-entered the war on 10 November 1918 on the side of the Allies and the Treaty of Bucharest was formally annulled by the Armistice of 11 November 1918.{{Sfn|Béla|1998|p=429}}{{Efn|Bessarabia remained part of Romania until 1940, when it was annexed by [[Joseph Stalin]] as the [[Moldavian Soviet Socialist Republic]];{{Sfn|Rothschild|1975|p=314}} following the dissolution of the USSR in 1991, it became the independent Republic of [[Moldova]]}}

=== Central Powers peace overtures ===
On 12 December 1916, after ten brutal months of the [[Battle of Verdun]] and a [[Romania in World War I#The counteroffensive of the Central Powers|successful offensive against Romania]], Germany attempted to negotiate a peace with the Allies.<ref name=lanoszka>{{cite news |url=https://www.washingtonpost.com/news/monkey-cage/wp/2018/11/11/why-the-first-world-war-lasted-so-long/? |author=Alexander Lanoszka |author2=Michael A. Hunzeker |title=Why the First War lasted so long |newspaper=[[The Washington Post]] |date=11 November 2018 |access-date=11 November 2018 |archive-date=12 April 2022 |archive-url=https://web.archive.org/web/20220412030938/https://www.washingtonpost.com/news/monkey-cage/wp/2018/11/11/why-the-first-world-war-lasted-so-long/ |url-status=live }}</ref> However, this attempt was rejected out of hand as a "duplicitous war ruse".<ref name=lanoszka />
[[File:River Crossing NGM-v31-p338.jpg|thumb|left|"''[[They shall not pass]]"'', a phrase typically associated with the defence of Verdun]]

US president [[Woodrow Wilson]] attempted to intervene as a peacemaker, asking for both sides to state their demands. [[David Lloyd George|Lloyd George's]] War Cabinet considered the German offer to be a ploy to create divisions among the Allies. After initial outrage and much deliberation, they took Wilson's note as a separate effort, signalling that the US was on the verge of entering the war against Germany following the "submarine outrages". While the Allies debated a response to Wilson's offer, the Germans chose to rebuff it in favour of "a direct exchange of views". Learning of the German response, the Allied governments were free to make clear demands in their response of 14 January. They sought restoration of damages, the evacuation of occupied territories, reparations for France, Russia and Romania, and a recognition of the principle of nationalities.{{sfn |Keegan |1998 |p=345}} The Allies sought guarantees that would prevent or limit future wars.{{sfn |Kernek |1970 |pp=721–766}} The negotiations failed and the Entente powers rejected the German offer on the grounds of honour, and noted Germany had not put forward any specific proposals.<ref name=lanoszka />

=== Final years of the war ===
{{Main|Timeline of World War I (1917–1918)}}

==== Russian Revolution and withdrawal ====
{{Main|Russian Revolution|February Revolution|October Revolution}}

By the end of 1916, Russian casualties totalled nearly five million killed, wounded or captured, with major urban areas affected by food shortages and high prices. In March 1917, Tsar Nicholas ordered the military to forcibly suppress strikes in [[Saint Petersburg|Petrograd]] but the troops refused to fire on the crowds.{{Sfn|Beckett|2007|p=523}} Revolutionaries set up the [[Petrograd Soviet]] and fearing a left-wing takeover, the [[State Duma]] forced Nicholas to abdicate and established the [[Russian Provisional Government]], which confirmed Russia's willingness to continue the war. However, the Petrograd Soviet refused to disband, creating [[Dual power|competing power centres]] and causing confusion and chaos, with frontline soldiers becoming increasingly demoralised.{{Sfn|Winter|2014|pp=110–132}}

Following the Tsar's abdication, [[Vladimir Lenin]]—with the help of the German government—was ushered from Switzerland into Russia on 16 April 1917. Discontent and the weaknesses of the Provisional Government led to a rise in the popularity of the Bolshevik Party, led by Lenin, which demanded an immediate end to the war. The Revolution of November was followed in December by an armistice and negotiations with Germany. At first, the Bolsheviks refused the German terms, but when German troops began marching across Ukraine unopposed, they acceded to the [[Treaty of Brest-Litovsk]] on 3{{nbsp}}March 1918. The treaty ceded vast territories, including Finland, Estonia, Latvia, Lithuania, and parts of Poland and Ukraine to the Central Powers.{{Sfn|Wheeler-Bennett|1938|pp=36–41}}

With the [[Russian Empire]] out of the war, Romania found itself alone on the Eastern Front and signed the [[Treaty of Bucharest (1918)|Treaty of Bucharest]] with the Central Powers in May 1918. Under the terms of the treaty, Romania ceded territory to Austria-Hungary and Bulgaria and leased its oil reserves to Germany. However, the terms also included the Central Powers' recognition of the union of [[Bessarabia]] with Romania.<ref>Treaty of Bucharest with the Central Powers in May 1918</ref><ref>R. J. Crampton, ''Eastern Europe in the twentieth century'', Routledge, 1994, {{ISBN|978-0-415-05346-4}}, pp. 24–25</ref>

==== United States enters the war ====
{{Main|American entry into World War I}}
[[File:President Woodrow Wilson asking Congress to declare war on Germany, 2 April 1917.jpg|thumb|right|upright=1.0|[[Woodrow Wilson|President Wilson]] asking [[United States Congress|Congress]] to declare war on Germany, 2 April 1917]]

The United States was a major supplier of war material to the Allies but remained neutral in 1914, in large part due to domestic opposition.{{Sfn|Stevenson|2012|pp=315–316}} The most significant factor in creating the support Wilson needed was the German submarine offensive, which not only cost American lives but paralysed trade as ships were reluctant to put to sea.{{Sfn|Stevenson|2012|p=317}}

On 6 April 1917, Congress [[United States declaration of war on Germany (1917)|declared war on Germany]] as an "Associated Power" of the Allies.{{sfn|Gilbert|1994|p=318}} The [[United States Navy|US Navy]] sent a [[United States Battleship Division Nine (World War I)|battleship group]] to [[Scapa Flow]] to join the Grand Fleet, and provided convoy escorts. In April 1917, the [[United States Army|US Army]] had fewer than 300,000 men, including [[Army National Guard|National Guard]] units, compared to British and French armies of 4.1 and 8.3&nbsp;million respectively. The [[Selective Service Act of 1917]] drafted 2.8&nbsp;million men, though training and equipping such numbers was a huge logistical challenge. By June 1918, over 667,000 members of the [[American Expeditionary Forces]] (AEF) were transported to France, a figure which reached 2 million by the end of November.{{Sfn|Grotelueschen|2006|pp=14–15}}

Despite his conviction that Germany must be defeated, Wilson went to war to ensure the US played a leading role in shaping the peace, which meant preserving the AEF as a separate military force, rather than being absorbed into British or French units as his Allies wanted.{{Sfn|Stevenson|2012|p=318}} He was strongly supported by AEF commander General [[John J. Pershing]], a proponent of pre-1914 "open warfare" who considered the French and British emphasis on artillery misguided and incompatible with American "offensive spirit".{{Sfn|Grotelueschen|2006|pp=44–46}} Much to the frustration of his Allies, who had suffered heavy losses in 1917, he insisted on retaining control of American troops, and refused to commit them to the front line until able to operate as independent units. As a result, the first significant US involvement was the [[Meuse–Argonne offensive]] in late September 1918.{{Sfn|Stevenson|2012|p=403}}

==== Nivelle Offensive (April–May 1917) ====
{{Further|Nivelle offensive|1917 French Army mutinies}}
[[File:Canadian tank and soldiers Vimy 1917.jpg|thumb|alt=Files of soldiers with rifles slung follow close behind a tank, there is a dead body in the foreground |[[Canadian Corps]] troops at the [[Battle of Vimy Ridge]], 1917]]

In December 1916, [[Robert Nivelle]] replaced Pétain as commander of French armies on the Western Front and began planning a [[Nivelle offensive|spring attack]] in [[Champagne (province)|Champagne]], part of a joint Franco-British operation.{{Sfn|Clayton|2003|p=124}} Poor security meant German intelligence was well informed on tactics and timetables, but despite this, when the attack began on 16 April the French made substantial gains, before being brought to a halt by the newly built and extremely strong defences of the Hindenburg Line. Nivelle persisted with frontal assaults and, by 25 April, the French had suffered nearly 135,000 casualties, including 30,000 dead, most incurred in the first two days.{{Sfn|Clayton|2003|p=129}}

Concurrent British attacks at [[Battle of Arras (1917)|Arras]] were more successful, though ultimately of little strategic value.{{sfn|Strachan|2003|p=244}} Operating as a separate unit for the first time, the [[Canadian Corps]]' capture of [[Battle of Vimy Ridge|Vimy Ridge]] is viewed by many Canadians as a defining moment in creating a sense of national identity.{{sfn|Inglis|1995|p=2}}{{sfn|Humphries|2007|p=66}} Though Nivelle continued the offensive, on 3 May the [[21st Infantry Division (France)|21st Division]], which had been involved in some of the heaviest fighting at Verdun, refused orders to go into battle, initiating the [[1917 French Army mutinies|French Army mutinies]]; within days, "collective indiscipline" had spread to 54 divisions, while over 20,000 deserted.{{Sfn|Horne|1964|p=323}}

==== Sinai and Palestine campaign (1917–1918) ====
{{Main|Sinai and Palestine campaign}}
[[File:Capture of Jerusalem 1917d.jpg|thumb|British artillery battery on [[Mount Scopus]] in the [[Battle of Jerusalem]], 1917.]]

In March and April 1917, at the [[First Battle of Gaza|First]] and [[Second Battle of Gaza|Second Battles of Gaza]], German and Ottoman forces stopped the advance of the Egyptian Expeditionary Force, which had begun in August 1916 at the Battle of Romani.{{sfn|Erickson |2001 |p=163}}<ref>{{cite book |title=The Mounted Riflemen in Sinai & Palestine: The Story of New Zealand's Crusaders |last=Moore |first=A. Briscoe |year=1920 |publisher=Whitcombe & Tombs |location=Christchurch |oclc=156767391 |page=67}}</ref> At the end of October 1917, the [[Sinai and Palestine campaign]] resumed, when General [[Edmund Allenby, 1st Viscount Allenby|Edmund Allenby]]'s [[XX Corps (United Kingdom)|XXth Corps]], [[XXI Corps (United Kingdom)|XXI Corps]] and [[Desert Mounted Corps]] won the [[Battle of Beersheba (1917)|Battle of Beersheba]].<ref>{{cite book |title=Military Operations. Part I Egypt & Palestine: Volume 2 From June 1917 to the End of the War |last=Falls |first=Cyril |series=Official History of the Great War Based on Official Documents by Direction of the Historical Section of the Committee of Imperial Defence |others=Maps compiled by A.F. Becke |year=1930 |publisher=HM Stationery Office |location=London |oclc=1113542987 |page=59}}</ref> Two Ottoman armies were defeated a few weeks later at the [[Battle of Mughar Ridge]] and, early in December, [[Jerusalem]] had been captured following another Ottoman defeat at the [[Battle of Jerusalem]].<ref>{{cite book |chapter=The Palestine Campaigns |last=Wavell |first=Earl |author-link=Archibald Wavell, 1st Earl Wavell |editor-last=Sheppard |editor-first=Eric William |edition=4th |title=A Short History of the British Army |year=1968 |orig-date=1933 |publisher=Constable & Co. |location=London |oclc=35621223 |pages=153–155}}</ref><ref>{{cite web |url=http://www.firstworldwar.com/source/jerusalemdecree.htm |title=Text of the Decree of the Surrender of Jerusalem into British Control |publisher=First World War.com |access-date=13 May 2015 |archive-url=https://web.archive.org/web/20110614214531/http://www.firstworldwar.com/source/jerusalemdecree.htm |archive-date=14 June 2011}}</ref><ref>{{cite book |title=The Last Crusade: The Palestine Campaign in the First World War |last=Bruce |first=Anthony |year=2002 |publisher=John Murray |location=London |isbn=978-0-7195-5432-2 |page=162}}</ref> About this time, [[Friedrich Freiherr Kress von Kressenstein]] was relieved of his duties as the Eighth Army's commander, replaced by [[Cevat Çobanlı|Djevad Pasha]], and a few months later the commander of the [[Military of the Ottoman Empire|Ottoman Army]] in Palestine, [[Erich von Falkenhayn]], was replaced by [[Otto Liman von Sanders]].<ref>{{cite web |url=http://www.firstworldwar.com/bio/kressenstein.htm |title=Who's Who – Kress von Kressenstein |publisher=First World War.com |access-date=13 May 2015 |archive-date=20 November 2015 |archive-url=https://web.archive.org/web/20151120122815/http://firstworldwar.com/bio/kressenstein.htm |url-status=live }}</ref><ref>{{cite web |url=http://www.firstworldwar.com/bio/liman.htm |title=Who's Who – Otto Liman von Sanders |publisher=First World War.com |access-date=13 May 2015 |archive-date=27 December 2007 |archive-url=https://web.archive.org/web/20071227070027/http://www.firstworldwar.com/bio/liman.htm |url-status=live }}</ref>

In early 1918, the front line was [[Capture of Jericho|extended]] and the [[British occupation of the Jordan Valley|Jordan Valley]] was occupied, following the [[First Transjordan attack on Amman|First Transjordan]] and the [[Second Transjordan attack on Shunet Nimrin and Es Salt|Second Transjordan]] attacks by British Empire forces in March and April 1918.{{sfn|Erickson |2001 |p=195}}

==== German offensive and Allied counter-offensive (March–November 1918) ====
{{Main|German spring offensive|Hundred Days Offensive}}
[[File:Riflemen-1918-Western-Front.png|thumb|Between April and November 1918, the Allies increased their front-line rifle strength while German strength fell by half.{{sfn |Ayers |1919 |p=104}}]]

In December 1917, the Central Powers signed an armistice with Russia, thus freeing large numbers of German troops for use in the West. With German reinforcements and new American troops pouring in, the outcome was to be decided on the Western Front. The Central Powers knew that they could not win a protracted war, but they held high hopes for success in a final quick offensive.{{sfn|Heyman|1997|pp=146–147}} Ludendorff drew up plans ([[Operation Michael]]) for the 1918 offensive on the Western Front. The operation commenced on 21 March 1918, with an attack on British forces near [[Saint-Quentin, Aisne|Saint-Quentin]]. German forces achieved an unprecedented advance of {{convert|60|km|mi}}.{{sfn |Westwell |2004}} The initial offensive was a success; after heavy fighting, however, the offensive was halted. Lacking tanks or [[Self-propelled artillery|motorised artillery]], the Germans were unable to consolidate their gains. The problems of re-supply were also exacerbated by increasing distances that now stretched over terrain that was shell-torn and often impassable to traffic.{{sfn|Gray|1991|p=86}}
Germany launched [[Battle of the Lys (1918)|Operation Georgette]] against the northern [[English Channel]] ports. The Allies halted the drive after limited territorial gains by Germany. The German Army to the south then conducted [[Third Battle of the Aisne|Operations Blücher and Yorck]], pushing broadly towards Paris. Germany launched Operation Marne ([[Second Battle of the Marne]]) on 15 July, in an attempt to encircle [[Reims]]. The resulting counter-attack, which started the [[Hundred Days Offensive]] on 8 August,{{sfn|Rickard|2007}} led to a marked collapse in German morale.<ref>{{cite book |publisher=Vanwell |orig-date=1977 |year=2004 |title=Shock Army of the British Empire: The Canadian Corps in the Last 100 Days of the Great War |last=Schreiber |first=Shane B. |place=St. Catharines, ON |isbn=978-1-55125-096-0 |oclc=57063659 | url = https://archive.org/details/shockarmyofbriti0000schr/mode/2up | url-access = registration | page = 50}}</ref>{{sfn |Rickard |2001}}<ref>{{cite book |publisher=Pan |orig-date=1998 |year=1999 |title=1918: Year of Victory |last=Brown |first=Malcolm |place=London |isbn=978-0-330-37672-3 |page=190}}</ref>
==== Allied advance to the Hindenburg Line ====
{{See also|Meuse-Argonne offensive}}
[[File:US23rdInfantry37mmGunInActionFrance1918-ARC531005.gif|thumb|American soldiers firing on German entrenched positions during the Meuse-Argonne offensive, 1918]]

By September, the Germans had fallen back to the Hindenburg Line. The Allies had [[Hundred Days Offensive#Advance to the Hindenburg Line|advanced to the Hindenburg Line]] in the north and centre. German forces launched numerous counterattacks, but positions and outposts of the Line continued falling, with the BEF alone taking 30,441&nbsp;prisoners in the last week of September. On 24 September, the Supreme Army Command informed the leaders in Berlin that armistice talks were inevitable.<ref name="Chron-FWW">{{harvnb|Gray|Argyle|1990}}</ref>

The [[Grand Offensive|final assault]] on the Hindenburg Line began with the [[Meuse-Argonne offensive]], launched by American and French troops on 26 September. Two days later the Belgians, French and British [[Fifth Battle of Ypres|attacked around Ypres]], and the day after the British at St Quentin in the centre of the line. The following week, cooperating American and French units broke through in [[Champagne (province)|Champagne]] at the [[Battle of Blanc Mont Ridge]] (3–27 October), forcing the Germans off the commanding heights, and closing towards the Belgian frontier.{{sfn |McLellan |p=49}} On 8{{nbsp}}October, the Hindenburg Line was pierced by British and Dominion troops of the First and Third British Armies at the [[Battle of Cambrai (1918)|Second Battle of Cambrai]].{{Sfn|Christie |1997|p=?}}

==== Breakthrough of Macedonian front (September 1918) ====
{{Main|Vardar offensive|Battle of Dobro Pole}}
[[File:Bulgarian major Ivanov with white flag surrendering to Serbian 7th Danube ragiment.jpg|thumb|Bulgarian major Ivanov with white flag surrendering to Serbian 7th Danube regiment near [[Kumanovo]]]]

Allied forces started the [[Vardar offensive]] on 15 September at two key points: [[Dobro Pole]] and near [[Dojran Lake]]. In the [[Battle of Dobro Pole]], the Serbian and French armies had success after a three-day-long battle with relatively small casualties, and subsequently made a breakthrough in the front, something which was rarely seen in World War I. After the front was broken, Allied forces started to liberate Serbia and reached [[Skopje]] at 29 September, after which [[Bulgaria during World War I|Bulgaria]] signed an armistice with the Allies on 30 September.<ref>{{Cite web|url=https://militaryhistorynow.com/2017/09/21/knock-out-blow-at-dobro-polje-six-facts-about-the-obscure-battle-that-ended-ww1/|title=The Battle of Dobro Polje – The Forgotten Balkan Skirmish That Ended WW1|website=Militaryhistorynow.com|access-date=2019-11-21|archive-date=2017-09-23 |archive-url=https://web.archive.org/web/20170923215523/http://militaryhistorynow.com/2017/09/21/knock-out-blow-at-dobro-polje-six-facts-about-the-obscure-battle-that-ended-ww1/|url-status=dead}}</ref><ref>{{Cite web |url=https://historycollection.co/ten-facts-battle-dobro-polje-battle-led-allied-victory-world-war/9/ |title=The Germans Could no Longer Keep up the Fight |website=historycollection.co |date=22 February 2017 |access-date=2019-11-21 |archive-date=23 December 2019 |archive-url=https://web.archive.org/web/20191223025225/https://historycollection.co/ten-facts-battle-dobro-polje-battle-led-allied-victory-world-war/9/ |url-status=live }}</ref>

=== Armistices and capitulations ===
{{Main|Armistice of Salonica|Armistice of Villa Giusti|Armistice of Mudros}}
{{Further|Armistice of Belgrade}}
[[File:Trento 3 novembre 1918.jpg|thumb|Italian troops reach [[Trento]] during the [[Battle of Vittorio Veneto]], 1918]]

The collapse of the Central Powers came swiftly. Bulgaria was the first to sign an armistice, the [[Armistice of Salonica]] on 29 September 1918.<ref name="indiana.edu-1918">{{cite web |url=http://www.indiana.edu/~league/1918.htm |website=League of Nations Photo Archive |title=1918 Timeline |access-date=20 November 2009 |archive-date=5 May 2016 |archive-url=https://web.archive.org/web/20160505134716/http://www.indiana.edu/~league/1918.htm |url-status=live }}</ref> German Emperor [[Wilhelm II]] in a telegram to [[Ferdinand I of Bulgaria|Bulgarian Tsar Ferdinand I]] described the situation thus: "Disgraceful! 62,000 Serbs decided the war!".<ref>{{cite web |url=https://militaryhistorynow.com/2017/09/21/knock-out-blow-at-dobro-polje-six-facts-about-the-obscure-battle-that-ended-ww1/ |archive-url=https://web.archive.org/web/20170923215523/http://militaryhistorynow.com/2017/09/21/knock-out-blow-at-dobro-polje-six-facts-about-the-obscure-battle-that-ended-ww1/ |url-status=dead |archive-date=23 September 2017 |title=The Battle of Dobro Polje – The Forgotten Balkan Skirmish That Ended WW1 |website=Militaryhistorynow.com |access-date=21 November 2019 |date=21 September 2017 }}</ref><ref>{{cite web|url=https://historycollection.co/ten-facts-battle-dobro-polje-battle-led-allied-victory-world-war/9/|title=The Germans Could no Longer Keep up the Fight|website=historycollection.com|access-date=21 November 2019|date=22 February 2017|archive-date=23 December 2019|archive-url=https://web.archive.org/web/20191223025225/https://historycollection.co/ten-facts-battle-dobro-polje-battle-led-allied-victory-world-war/9/|url-status=live}}</ref> On the same day, the [[Oberste Heeresleitung|German Supreme Army Command]] informed Kaiser Wilhelm II and the [[Imperial Chancellor (Germany)|Imperial Chancellor]] Count [[Georg von Hertling]], that the military situation facing Germany was hopeless.{{Sfn|Axelrod|2018|p=260}}

On 24 October, the Italians began a push that rapidly recovered territory lost after the Battle of Caporetto. This culminated in the Battle of Vittorio Veneto, marking the end of the Austro-Hungarian Army as an effective fighting force. The offensive also triggered the disintegration of the Austro-Hungarian Empire. During the last week of October, declarations of independence were made in Budapest, Prague, and Zagreb. On 29 October, the imperial authorities asked Italy for an armistice, but the Italians continued advancing, reaching Trento, Udine, and Trieste. On 3{{nbsp}}November, Austria-Hungary sent a [[White flag|flag of truce]] and accepted the [[Armistice of Villa Giusti]], arranged with the Allied Authorities in Paris. Austria and Hungary signed separate armistices following the overthrow of the [[Habsburg monarchy]]. In the following days, the Italian Army occupied [[Innsbruck]] and all [[Tyrol]], with over 20,000 soldiers.<ref>{{cite journal |author=Andrea di Michele |title=Trento, Bolzano e Innsbruck: l'occupazione militare italiana del Tirolo (1918–1920) |language=it |trans-title=Trento, Bolzano and Innsbruck: The Italian Military Occupation of Tyrol (1918–1920) |journal=Trento e Trieste. Percorsi degli Italiani d'Austria dal '48 all'annessione |year=2014 |pages=436–437 |quote=La forza numerica del contingente italiano variò con il passare dei mesi e al suo culmine raggiunse i 20–22.000 uomini. [The numerical strength of the Italian contingent varied with the passing of months and at its peak reached 20–22,000 men.] |url=http://www.agiati.it/UploadDocs/12255_Art_20_di_michele.pdf |archive-url=https://web.archive.org/web/20181002053915/http://www.agiati.it/UploadDocs/12255_Art_20_di_michele.pdf |url-status=dead |archive-date=2 October 2018 }} <!--see https://www.agiati.it/memorie-trento-e-trieste-rasera-caffieri for metadata --></ref>

On 30 October, the Ottoman Empire capitulated, and signed the Armistice of Mudros.<ref name="indiana.edu-1918" />

==== German government surrenders ====
{{Main|Armistice of 11 November 1918}}
[[File:Armisticetrain.jpg|thumb|upright=0.8|[[Ferdinand Foch]] (''second from right'') pictured outside the [[Compiègne Wagon|carriage]] in [[Compiègne]] after agreeing to the [[Armistice of 11 November 1918|armistice]] that ended the war there.<ref>{{cite web |url=http://www.compiegne.fr/decouvrir/clairierearmistice.asp |url-status=dead |archive-url= https://web.archive.org/web/20070827142334/http://www.compiegne.fr/decouvrir/clairierearmistice.asp |archive-date=27 August 2007 |title=Clairière de l'Armistice |publisher=Ville de [[Compiègne]] |language=fr}}</ref>]]

With the military faltering and with widespread loss of confidence in the Kaiser leading to his abdication and fleeing of the country, Germany moved towards surrender. Prince Maximilian of Baden took charge on October 3 as Chancellor of Germany. Negotiations with President Wilson began immediately, in the hope that he would offer better terms than the British and French. Wilson demanded a constitutional monarchy and parliamentary control over the German military.{{sfn|Stevenson|2004|p=385}}

The [[German Revolution of 1918–1919]] began at the end of October 1918. Units of the German Navy refused to set sail for a last, large-scale operation in a war they believed to be as good as lost. The [[Kiel mutiny|sailors' revolt]], which then ensued in the naval ports of [[Wilhelmshaven]] and [[Kiel]], spread across the whole country within days and led to the [[Proclamation of the republic in Germany|proclamation of a republic]] on 9{{nbsp}}November 1918, shortly thereafter to the [[Abdication of Wilhelm II|abdication of Kaiser Wilhelm II]], and German surrender.<ref>{{cite web |author=K. Kuhl |title=Die 14 Kieler Punkte |trans-title=The Kiel 14 points |url=http://www.kurkuhl.de/docs/kieler_14punkte.pdf |url-status=live |archive-url=https://web.archive.org/web/20190412035214/http://www.kurkuhl.de/docs/kieler_14punkte.pdf |archive-date=12 April 2019 |access-date=23 November 2018}}</ref><ref>{{cite book |last=Dähnhardt |first=D. |title=Revolution in Kiel |publisher=Karl Wachholtz Verlag |year=1978 |isbn=978-3-529-02636-2 |location=Neumünster |page=91}}</ref><ref>{{cite book |last=Wette |first=Wolfram |title=Kieler Erinnerungsorte |publisher=Boyens |year=2006 |editor-last=Fleischhauer |chapter=Die Novemberrevolution – Kiel 1918 |author-link=Wolfram Wette |editor2-last=Turowski}}</ref>{{sfn |Stevenson |2004 |p=383}}{{sfn|Stevenson|2004|loc=Chapter 17}}

== Aftermath ==
{{Main|Aftermath of World War I}}

In the aftermath of the war, the German, Austro-Hungarian, Ottoman, and Russian empires disappeared.{{efn| Unlike the others, the successor state to the Russian Empire, the Union of Soviet Socialist Republics, retained similar external borders, via retaining or quickly recovering lost territories.}} Numerous nations regained their former independence, and new ones were created. Four dynasties fell as a result of the war: the [[House of Romanov|Romanovs]], the [[House of Hohenzollern|Hohenzollerns]], the [[House of Habsburg|Habsburgs]], and the [[Ottoman dynasty|Ottomans]]. Belgium and Serbia were badly damaged, as was France, with 1.4 million soldiers dead,<ref>[http://news.bbc.co.uk/2/hi/europe/7199127.stm "France's oldest WWI veteran dies"] {{webarchive |url=https://web.archive.org/web/20161028021340/http://news.bbc.co.uk/2/hi/europe/7199127.stm |date=28 October 2016 }}, ''BBC News'', 20 January 2008.</ref> not counting other casualties. Germany and Russia were similarly affected.<ref name="Tucker 2005 2732">{{harvnb|Tucker|Roberts|2005|p=[{{google books |plainurl=y |id=2YqjfHLyyj8C |page=273}} 273]}}</ref>

=== Formal end of the war ===
[[File:William Orpen - The Signing of Peace in the Hall of Mirrors.jpg|thumb|upright=0.8|The signing of the [[Treaty of Versailles]] in the [[Hall of Mirrors]], Versailles, 28 June 1919, by Sir [[William Orpen]]]]

A formal state of war between the two sides persisted for another seven months, until the signing of the [[Treaty of Versailles]] with Germany on 28 June 1919. The US Senate did not ratify the treaty despite public support for it,<ref>{{cite book |last=Hastedt |first=Glenn P. |title=Encyclopedia of American Foreign Policy |publisher=Infobase Publishing |date=2009 |page=483 |isbn=978-1-4381-0989-3}}</ref><ref>{{cite book |last1=Murrin |first1=John |last2=Johnson |first2=Paul |last3=McPherson |first3=James |last4=Gerstle |first4=Gary |last5=Fahs |first5=Alice|title=Liberty, Equality, Power: A History of the American People |publisher=Cengage Learning |volume=II |date=2010 |page=622 |isbn=978-0-495-90383-3}}</ref> and did not formally end its involvement in the war until the [[Knox–Porter Resolution]] was signed on 2{{nbsp}}July 1921 by President [[Warren G. Harding]].<ref>{{cite news |title=Harding Ends War; Signs Peace Decree at Senator's Home. Thirty Persons Witness Momentous Act in Frelinghuysen Living Room at Raritan |newspaper=[[The New York Times]] |url=https://query.nytimes.com/gst/abstract.html?res=F10B13F63C5D14738DDDAA0894DF405B818EF1D3 |date=3 July 1921 |access-date=18 September 2017 |archive-date=4 December 2013 |archive-url=https://web.archive.org/web/20131204011723/http://query.nytimes.com/gst/abstract.html?res=F10B13F63C5D14738DDDAA0894DF405B818EF1D3 |url-status=live }}</ref> For the British Empire, the state of war ceased under the provisions of the ''[[Termination of the Present War (Definition) Act 1918]]'' concerning:

:* Germany on 10 January 1920.<ref>{{London Gazette |issue= 31773 |date= 10 February 1920 |page=1671}}</ref>
:* Austria on 16 July 1920.<ref>{{London Gazette |issue= 31991 |date= 23 July 1920 |pages=7765–7766 }}</ref>
:* Bulgaria on 9 August 1920.<ref>{{London Gazette |issue= 13627 |date= 27 August 1920 |page=1924}}</ref>
:* Hungary on 26 July 1921.<ref>{{London Gazette |issue= 32421 |date= 12 August 1921 |pages=6371–6372 }}</ref>
:* Turkey on 6 August 1924.<ref>{{London Gazette |issue= 32964 |date= 12 August 1924 |pages=6030–6031 }}</ref>

[[File:Venizelos signing the Treaty of Sevres.jpeg|thumb|right|Greek prime minister [[Eleftherios Venizelos]] signing the [[Treaty of Sèvres]]]]
Some [[war memorial]]s date the end of the war as being when the Versailles Treaty was signed in 1919, which was when many of the troops serving abroad finally returned home; by contrast, most commemorations of the war's end concentrate on the armistice of 11 November 1918.<ref>{{cite web|url=http://www.warmemorials.org/uploads/publications/117.pdf|title=Dates on war memorials|publisher=War Memorials Trust|access-date=4 January 2021|archive-date=12 January 2021|archive-url=https://web.archive.org/web/20210112055457/http://www.warmemorials.org/uploads/publications/117.pdf|url-status=live}}</ref>

=== Peace treaties and national boundaries ===
[[File:Map Europe 1923-en.svg|thumb|upright=1.25|Map of [[List of national border changes (1914–present)|territorial changes in Europe]] after World War I (as of 1923)]]

The [[Paris Peace Conference (1919–1920)|Paris Peace Conference]] imposed a series of peace treaties on the Central Powers officially ending the war. The 1919 [[Treaty of Versailles]] dealt with Germany and, building on [[Fourteen Points|Wilson's 14th point]], established the [[League of Nations]] on 28 June 1919.{{sfn |Magliveras |1999 |pp=8–12}}{{sfn |Northedge |1986 |pp=35–36}}

The Central Powers had to acknowledge responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by" their aggression. In the Treaty of Versailles, this statement was [[Article 231 of the Treaty of Versailles|Article 231]]. This article became known as the "War Guilt Clause", as the majority of Germans felt humiliated and resentful.<ref>{{cite book |first=John H. |last=Morrow |title=The Great War: An Imperial History |publisher=Routledge |location=London |year=2005 |isbn=978-0-415-20440-8 |page=290}}</ref> The Germans felt they had been unjustly dealt with by what they called the "[[diktat]] of Versailles". German historian Hagen Schulze said the Treaty placed Germany "under legal sanctions, deprived of military power, economically ruined, and politically humiliated."<ref>{{cite book |first=Hagen |last=Schulze |title=Germany: A New History |url={{google books |plainurl=y |id=B84ZaAdGbS4C |page=204}} |year=1998 |publisher=Harvard U.P. |page=204}}</ref> Belgian historian Laurence Van Ypersele emphasises the central role played by memory of the war and the Versailles Treaty in German politics in the 1920s and 1930s:
<blockquote>Active denial of war guilt in Germany and German resentment at both reparations and continued Allied occupation of the Rhineland made widespread revision of the meaning and memory of the war problematic. The legend of the "[[Stab-in-the-back myth|stab in the back]]" and the wish to revise the "Versailles diktat", and the belief in an international threat aimed at the elimination of the German nation persisted at the heart of German politics. Even a man of peace such as <nowiki>[</nowiki>[[Gustav Stresemann|Gustav]]<nowiki>]</nowiki> Stresemann publicly rejected German guilt. As for the Nazis, they waved the banners of domestic treason and international conspiracy in an attempt to galvanise the German nation into a spirit of revenge. Like a Fascist Italy, Nazi Germany sought to redirect the memory of the war to the benefit of its policies.<ref>{{cite book |first=Laurence Van |last=Ypersele |chapter=Mourning and Memory, 1919–45 |editor-first=John |editor-last=Horne |title=A Companion to World War I |url={{google books |plainurl=y |id=EjZHLXRKjtEC |page=584}} |year=2012 |publisher=Wiley |page=584}}</ref></blockquote>

Meanwhile, new nations liberated from German rule viewed the treaty as a recognition of wrongs committed against small nations by much larger aggressive neighbours.<ref>{{cite web|url=http://www.owlnet.rice.edu/~ethomp/The%20Surrogate%20Hegemon.pdf|title=The Surrogate Hegemon in Polish Postcolonial Discourse Ewa Thompson, Rice University|access-date=27 October 2013|archive-date=29 October 2013|archive-url=https://web.archive.org/web/20131029211408/http://www.owlnet.rice.edu/~ethomp/The%20Surrogate%20Hegemon.pdf|url-status=live}}</ref>[[File:Dissolution of Austria-Hungary.png|thumb|upright=1.25|[[Dissolution of Austria-Hungary]] after war]]Austria-Hungary was partitioned into several successor states, largely but not entirely along ethnic lines. Apart from Austria and Hungary, Czechoslovakia, Italy, Poland, Romania and Yugoslavia received territories from the Dual Monarchy (the formerly separate and autonomous [[Kingdom of Croatia-Slavonia]] was incorporated into Yugoslavia). The details were contained in the treaties of [[Treaty of Saint-Germain-en-Laye (1919)|Saint-Germain-en-Laye]] and [[Treaty of Trianon|Trianon]]. As a result, Hungary lost 64% of its total population, decreasing from 20.9 million to 7.6 million, and losing 31% (3.3 out of 10.7&nbsp;million) of its ethnic [[Hungarian people|Hungarians]].<ref>{{cite web |url=http://open-site.org/Regional/Europe/Hungary |title=Open-Site:Hungary |access-date=11 January 2022 |archive-date=3 January 2022 |archive-url=https://web.archive.org/web/20220103140810/http://open-site.org/Regional/Europe/Hungary |url-status=live }}</ref> According to the 1910 census, speakers of the Hungarian language included approximately 54% of the entire population of the [[Kingdom of Hungary]]. Within the country, numerous ethnic minorities were present: 16.1% [[Romanians]], 10.5% [[Slovaks]], 10.4% [[Germans]], 2.5% [[Ruthenians]], 2.5% [[Serbs]] and 8% others.<ref name="Frucht, p. 356">Frucht, p. 356.</ref> Between 1920 and 1924, 354,000 Hungarians fled former Hungarian territories attached to Romania, Czechoslovakia, and Yugoslavia.<ref>{{cite book |first1=Károly |last1=Kocsis |first2=Eszter Kocsisné |last2=Hodosi |title=Ethnic Geography of the Hungarian Minorities in the Carpathian Basin |year=1998 |isbn=978-963-7395-84-0 |page=19|publisher=Geographical Research Institute, Research Centre and Earth Sciences }}</ref>

The Russian Empire lost much of its western frontier as the newly independent nations of [[History of Estonia#Road to the republic|Estonia]], [[History of Finland#Independence and Civil War|Finland]], [[History of Latvia#Independence|Latvia]], [[History of Lithuania#Independent Lithuania (1918–40)|Lithuania]], and [[Second Polish Republic|Poland]] were carved from it. Romania took control of Bessarabia in April 1918.{{sfn |Clark |1927}}

=== National identities ===
{{Further|Sykes–Picot Agreement}}

After 123 years, Poland re-emerged as an independent country. The Kingdom of Serbia and its dynasty, as a "minor Entente nation" and the country with the most casualties per capita,<ref>{{cite news |title=Appeals to Americans to Pray for Serbians |newspaper=[[The New York Times]] |date=27 July 1918 |url=https://timesmachine.nytimes.com/timesmachine/1918/07/27/102727338.pdf |access-date=12 June 2018 |archive-date=16 September 2018 |archive-url=https://web.archive.org/web/20180916183729/https://timesmachine.nytimes.com/timesmachine/1918/07/27/102727338.pdf |url-status=live }}</ref><ref>{{cite news |title=Serbia Restored |newspaper=[[The New York Times]] |date=5 November 1918 |url=https://timesmachine.nytimes.com/timesmachine/1918/11/05/98273895.pdf |access-date=12 June 2018 |archive-date=16 September 2018 |archive-url=https://web.archive.org/web/20180916183845/https://timesmachine.nytimes.com/timesmachine/1918/11/05/98273895.pdf |url-status=live }}</ref><ref>{{cite web |title=The Minor Powers During World War One&nbsp;– Serbia |first=Matt |last=Simpson |publisher=firstworldwar.com |date=22 August 2009 |url=http://www.firstworldwar.com/features/minorpowers_serbia.htm |access-date=27 May 2010 |archive-date=27 April 2010 |archive-url=https://web.archive.org/web/20100427065927/http://www.firstworldwar.com/features/minorpowers_serbia.htm |url-status=live }}</ref> became the backbone of a new multinational state, the [[Kingdom of Yugoslavia|Kingdom of Serbs, Croats and Slovenes]], later renamed Yugoslavia. Czechoslovakia, combining the [[Kingdom of Bohemia]] with parts of the Kingdom of Hungary, became a new nation. Romania would [[Great Union|unite]] all Romanian-speaking people under a single state, leading to [[Greater Romania]].<ref>Cas Mudde. [https://books.google.com/books?id=bNp6CAlMMcUC&dq=%22term+greater+romania%22&pg=PA190 ''Racist Extremism in Central and Eastern Europe''] {{Webarchive|url=https://web.archive.org/web/20160515100954/https://books.google.com/books?id=bNp6CAlMMcUC#v=onepage&q=%22term%20greater%20romania%22&f=false |date=15 May 2016 }}</ref>

In Australia and New Zealand, the Battle of Gallipoli became known as those nations' "Baptism of Fire". It was the first major war in which the newly established countries fought, and it was one of the first times that Australian troops fought as Australians, not just subjects of the [[The Crown|British Crown]], and independent national identities for these nations took hold. [[Anzac Day]], commemorating the Australian and New Zealand Army Corps (ANZAC), celebrates this defining moment.<ref>{{cite news |url=https://www.nytimes.com/1916/04/26/archives/anzac-day-in-london-king-queen-and-general-birdwood-at-services-in.html |title='ANZAC Day' in London; King, Queen, and General Birdwood at Services in Abbey |newspaper=[[The New York Times]] |date=26 April 1916 |access-date=25 July 2018 |archive-date=15 July 2016 |archive-url=https://web.archive.org/web/20160715010040/http://query.nytimes.com/gst/abstract.html?res=9400E1DD113FE233A25755C2A9629C946796D6CF&scp=12&sq=New+Zealand+anzac&st=p |url-status=live }}</ref><ref name="awmtradition">{{cite web |url=http://www.awm.gov.au/commemoration/anzac/anzac_tradition.asp |title=The ANZAC Day tradition |last=Australian War Memorial |publisher=[[Australian War Memorial]] |archive-url=https://web.archive.org/web/20080501163212/http://www.awm.gov.au/commemoration/anzac/anzac_tradition.asp |archive-date=1 May 2008 |url-status=dead |access-date=2 May 2008}}</ref>

In the aftermath of World War I, Greece [[Greco-Turkish War (1919–1922)|fought]] against Turkish nationalists led by [[Mustafa Kemal Atatürk|Mustafa Kemal]], a war that eventually resulted in a [[Population exchange between Greece and Turkey|massive population exchange between the two countries]] under the Treaty of Lausanne.<ref>[http://www.spiegel.de/international/0,1518,451140,00.html "The Diaspora Welcomes the Pope"] {{webarchive|url=https://web.archive.org/web/20120604185021/http://www.spiegel.de/international/0%2C1518%2C451140%2C00.html|date=4 June 2012}}, ''Der Spiegel'' Online. 28 November 2006.</ref> According to various sources,<ref>{{cite journal |last1=Rummel |first1=R.J. |author-link=R.J. Rummel |year=1998 |title=The Holocaust in Comparative and Historical Perspective |journal=Idea Journal of Social Issues |volume=3 |issue=2}}</ref> several hundred thousand Greeks died during this period, which was tied in with the Greek genocide.<ref>{{cite news |last=Hedges |first=Chris |date=17 September 2000 |title=A Few Words in Greek Tell of a Homeland Lost |work=The New York Times |url=https://www.nytimes.com/2000/09/17/nyregion/a-few-words-in-greek-tell-of-a-homeland-lost.html |url-status=live |access-date=23 February 2017 |archive-url=https://web.archive.org/web/20181125062332/https://www.nytimes.com/2000/09/17/nyregion/a-few-words-in-greek-tell-of-a-homeland-lost.html |archive-date=25 November 2018}}</ref>

== Casualties ==
{{Main|World War I casualties}}
{{Further|Spanish flu|Gueules cassées}}
[[File:Transporting Ottoman injured at Sirkedji.jpg|thumb|left|Men transporting wounded Ottoman at [[Sirkeci]]]]

Of the 60 million European military personnel who were mobilised from 1914 to 1918, an estimated [[World War I casualties|8 million were killed]], 7 million were permanently disabled, and 15&nbsp;million were seriously injured. Germany lost 15.1% of its active male population, Austria-Hungary lost 17.1%, and France lost 10.5%.{{sfn |Kitchen |2000 |p=22}} France mobilised 7.8&nbsp;million men, of which 1.4&nbsp;million died and 3.2 million were injured.<ref>Sévillia, Jean, Histoire Passionnée de la France, 2013, p. 395</ref> Approximately 15,000 deployed men sustained gruesome facial injuries, causing social stigma and marginalisation; they were called the ''[[gueules cassées]]'' (broken faces). In Germany, civilian deaths were 474,000 higher than in peacetime, due in large part to food shortages and malnutrition that had weakened disease resistance. These excess deaths are estimated as 271,000 in 1918, plus another 71,000 in the first half of 1919 when the blockade was still in effect.{{Sfn|Howard|1993|p=166}} Starvation caused by famine killed approximately 100,000 people in Lebanon.{{sfn |Saadi |2009}}

[[File:Emergency hospital during Influenza epidemic, Camp Funston, Kansas - NCP 1603.jpg|thumb|Emergency military hospital during the [[Spanish flu]] pandemic in [[Camp Funston]], [[Kansas]], 1918]]
Diseases flourished in the chaotic wartime conditions. In 1914 alone, louse-borne [[epidemic typhus]] killed 200,000 in Serbia.{{sfn |Tschanz}} Starting in early 1918, a major influenza epidemic known as [[Spanish flu]] spread across the world, accelerated by the movement of large numbers of soldiers, often crammed together in camps and transport ships with poor sanitation. The Spanish flu killed at least 17 to 25 million people,{{Sfn|Spreeuwenberg|2018|pp=2561–2567}}{{sfn |Knobler |Mack |Mahmoud |Lemon |2005}} including an estimated 2.64 million Europeans and as many as 675,000 Americans.<ref name="Ansart et al. 2009">{{cite journal|last1=Ansart|first1=Séverine|last2=Pelat|first2=Camille|last3=Boelle|first3=Pierre-Yves|last4=Carrat|first4=Fabrice|last5=Flahault|first5=Antoine|first6=Alain-Jacques|last6=Valleron|url= |title=Mortality burden of the 1918–1919 influenza pandemic in Europe|journal=[[Influenza and Other Respiratory Viruses]]|publisher=[[Wiley (publisher)|Wiley]]|volume=3|issue=3|date=May 2009|doi=10.1111/j.1750-2659.2009.00080.x|pages=99–106|pmid=19453486 |pmc=4634693}}</ref> Between 1915 and 1926, an epidemic of [[encephalitis lethargica]] affected nearly five million people worldwide.<ref>K. von Economo.''Wiener klinische Wochenschrift'', 10 May 1917, 30: 581–585. Die Encephalitis lethargica. Leipzig and Vienna, Franz Deuticke, 1918.</ref><ref name=Reid_2001>{{cite journal |author1=Reid, A.H. |author2=McCall, S. |author3=Henry, J.M. |author4=Taubenberger, J.K. |title=Experimenting on the Past: The Enigma of von Economo's Encephalitis Lethargica |journal=J. Neuropathol. Exp. Neurol. |volume=60 |issue=7 |pages=663–670 |year=2001 |pmid=11444794 |doi=10.1093/jnen/60.7.663 |s2cid=40754090 |doi-access=free}}</ref>

Eight million [[Equus (genus)|equines]] mostly [[horse]]s, [[donkey]]s and [[mule]]s died, three-quarters of them from the extreme conditions they worked in.<ref>{{Cite web |date=2020-11-10 |title=War Horse – The True Story |url=https://www.albertaanimalhealthsource.ca/content/war-horse-true-story |access-date=2024-01-08 |website=Alberta Animal Health Source |language=en |archive-date=8 January 2024 |archive-url=https://web.archive.org/web/20240108180307/https://www.albertaanimalhealthsource.ca/content/war-horse-true-story |url-status=live }}</ref>

=== War crimes ===
{{Main|War crimes in World War I}}

==== Chemical weapons in warfare ====
{{Main|Chemical weapons in World War I}}
[[File:French soldiers making a gas and flame attack on German trenches in Flanders. Belgium., ca. 1900 - 1982 - NARA - 530722.tif|thumb|French soldiers making a gas and flame attack on German trenches in Flanders]]

The German army was the first to successfully deploy chemical weapons during the Second Battle of Ypres (April–May 1915), after German scientists under the direction of [[Fritz Haber]] at the [[Kaiser Wilhelm Society|Kaiser Wilhelm Institute]] developed a method to weaponize [[chlorine]].{{efn|A [[Battle of Humin-Bolimów|German attempt]] to use chemical weapons on the Russian front in January 1915 failed to cause casualties.<ref>{{cite web |title=History of United States' Involvement in Chemical Warfare |url=https://www.denix.osd.mil/rcwmprogram/history/ |website=www.denix.osd.mil |access-date=1 March 2024 |archive-date=1 March 2024 |archive-url=https://web.archive.org/web/20240301154930/https://www.denix.osd.mil/rcwmprogram/history/ |url-status=live }}</ref> }}<ref name="AJPH">{{cite journal |last=Fitzgerald |first=Gerard |title=Chemical Warfare and Medical Response During World War I |journal=[[American Journal of Public Health]] |volume=98 |issue=4 |pages=611–625 |date=April 2008 |doi=10.2105/AJPH.2007.11930 |doi-access=free |pmid=18356568 |pmc=2376985 |quote=<!--In the late afternoon of April 22, 1915, members of a special unit of the German Army opened the valves on more than 6000 steel cylinders arrayed in trenches along their defensive perimeter at Ypres, Belgium. Within 10 minutes, 160 tons of chlorine gas drifted over the opposing French trenches, engulfing all those downwind.&nbsp;... The attack that spring day, nonetheless, marked a turning point in military history, as it is recognized as the first successful use of lethal chemical weapons on the battlefield.&nbsp;... Although chemical weapons killed proportionally few soldiers in World War{{nbsp}}I (1914–1918), the psychological damage from 'gas fright' and the exposure of large numbers of soldiers, munitions workers, and civilians to chemical agents had significant public health consequences.&nbsp;... By the time of the armistice on 11 November 1918, the use of chemical weapons such as chlorine, phosgene, and mustard gas had resulted in more than 1.3 million casualties and approximately 90,000 deaths.-->}}</ref> The use of chemical weapons had been sanctioned by the German High Command to force Allied soldiers out of their entrenched positions, complementing rather than supplanting more lethal conventional weapons.<ref name="AJPH" /> Chemical weapons were deployed by all major belligerents throughout the war, inflicting approximately 1.3&nbsp;million casualties, of which about 90,000 were fatal.<ref name="AJPH" /> The use of chemical weapons in warfare was a direct violation of the [[Hague Conventions of 1899 and 1907#Hague Convention of 1899|1899 Hague Declaration Concerning Asphyxiating Gases]] and the [[Hague Conventions of 1899 and 1907|1907 Hague Convention on Land Warfare]], which prohibited their use.<ref>{{cite book|url=https://archive.org/details/anatomyofnuremb00tayl/page/34 |title=The Anatomy of the Nuremberg Trials: A Personal Memoir |first=Telford |last=Taylor |year=1993 |publisher=[[Little, Brown and Company]] |isbn=978-0-316-83400-1 |access-date=20 June 2013 |page=[https://archive.org/details/anatomyofnuremb00tayl/page/34 34] |via=Internet Archive}}</ref><ref>{{cite book |url={{google books |plainurl=y |id=0PYx0j3wRvAC |page=7}} |title=Cornerstones of Security: Arms Control Treaties in the Nuclear Era |first1=Thomas |last1=Graham |first2=Damien J. |last2=Lavera |date=2003 |pages=7–9 |publisher=[[University of Washington Press]] |isbn=978-0-295-98296-0 |access-date=5 July 2013}}</ref>

==== Genocides by the Ottoman Empire ====
{{Main|Armenian genocide|Sayfo|Greek genocide}}
{{See also|Late Ottoman genocides|Armenian genocide denial}}
[[File:Morgenthau336.jpg|thumb|Armenians killed during the Armenian genocide. Image taken from ''Ambassador Morgenthau's Story'', written by [[Henry Morgenthau Sr.]] and published in 1918.<ref>{{cite book |author=Henry Morgenthau |title=Ambassador Mogenthau's story |publisher=Brigham Young University |chapter-url=http://net.lib.byu.edu/~rdh7/wwi/comment/morgenthau/Morgen25.htm |year=1918 |chapter=XXV: Talaat Tells Why He "Deports" the Armenians |access-date=6 June 2012 |archive-date=12 June 2012 |archive-url=https://web.archive.org/web/20120612014938/http://net.lib.byu.edu/~rdh7/wwi/comment/morgenthau/Morgen25.htm |url-status=live }}</ref>]]

The [[ethnic cleansing]] of the Ottoman Empire's Armenian population, including mass deportations and executions, during the final years of the Ottoman Empire is considered [[genocide]].<ref name="IAGSletter">{{cite web |url=http://www.genocidewatch.org/TurkishPMIAGSOpenLetterreArmenia6-13-05.htm |archive-url=https://web.archive.org/web/20071006024502/http://www.genocidewatch.org/TurkishPMIAGSOpenLetterreArmenia6-13-05.htm |archive-date=6 October 2007 |author=International Association of Genocide Scholars |title=Open Letter to the Prime Minister of Turkey Recep Tayyip Erdoğan |date=13 June 2005 |url-status=dead |author-link=International Association of Genocide Scholars }}</ref> The Ottomans carried out organised and systematic massacres of the Armenian population at the beginning of the war and manipulated acts of Armenian resistance by portraying them as rebellions to justify further extermination.<ref name=leverkun>{{cite book |last=Vartparonian |first=Paul Leverkuehn |others=translated by Alasdair Lean; with a preface by Jorge and a historical introduction by Hilmar |title=A German officer during the Armenian genocide: a biography of Max von Scheubner-Richter |year=2008 |publisher=Taderon Press for the Gomidas Institute |location=London |isbn=978-1-903656-81-5 |url=https://books.google.com/books?id=_hItAQAAIAAJ |author2=Kaiser |access-date=14 May 2016 |archive-date=26 March 2017 |archive-url=https://web.archive.org/web/20170326152834/https://books.google.com/books?id=_hItAQAAIAAJ |url-status=live }}</ref> In early 1915, several Armenians volunteered to join the Russian forces and the Ottoman government used this as a pretext to issue the [[Temporary Law of Deportation|Tehcir Law]] (Law on Deportation), which authorised the deportation of Armenians from the Empire's eastern provinces to Syria between 1915 and 1918. The Armenians were intentionally [[Death march|marched to death]] and a number were attacked by Ottoman brigands.{{sfn |Ferguson |2006 |p=177}} While the exact number of deaths is unknown, the [[International Association of Genocide Scholars]] estimates around 1.5 million.<ref name="IAGSletter" /><ref>{{cite web |url=http://www.genocidescholars.org/sites/default/files/document%09%5Bcurrent-page%3A1%5D/documents/US%20Congress_%20Armenian%20Resolution.pdf |title=International Association of Genocide Scholars |access-date=12 March 2013 |archive-date=10 October 2017 |archive-url=https://wayback.archive-it.org/all/20171010071506/http://www.genocidescholars.org/sites/default/files/document%09%5Bcurrent-page%3A1%5D/documents/US%20Congress_%20Armenian%20Resolution.pdf |url-status=dead }}</ref> The government of Turkey continues to [[Armenian genocide denial|deny the genocide]] to the present day, arguing that those who died were victims of inter-ethnic fighting, famine, or disease during World War{{nbsp}}I; these claims are rejected by most historians.{{sfn |Fromkin |1989 |pp=212–215}}

Other ethnic groups were similarly attacked by the Ottoman Empire during this period, including Assyrians and [[Greek genocide|Greeks]], and some scholars consider those events to be part of the same policy of extermination.<ref>{{cite web |author=International Association of Genocide Scholars |url=http://www.genocidescholars.org/images/Resolution_on_genocides_committed_by_the_Ottoman_Empire.pdf |archive-url=https://web.archive.org/web/20080422005726/http://genocidescholars.org/images/Resolution_on_genocides_committed_by_the_Ottoman_Empire.pdf |archive-date=22 April 2008 |url-status=dead |title=Resolution on genocides committed by the Ottoman empire }}</ref><ref>{{cite book |last=Gaunt |first=David |url={{google books |plainurl=y |id=4mug9LrpLKcC}} |title=Massacres, Resistance, Protectors: Muslim-Christian Relations in Eastern Anatolia during World War I |location=Piscataway, New Jersey |publisher=Gorgias Press |year=2006 }}{{Dead link|date=February 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref>{{cite journal |doi=10.1080/14623520801950820 |last1=Schaller |first1=Dominik J. |last2=Zimmerer |first2=Jürgen |year=2008 |title=Late Ottoman genocides: the dissolution of the Ottoman Empire and Young Turkish population and extermination policies&nbsp;– introduction |journal=Journal of Genocide Research |volume=10 |issue=1 |pages=7–14 |s2cid=71515470 }}</ref> At least 250,000 Assyrian Christians, about half of the population, and 350,000–750,000 [[Greeks in Turkey|Anatolian]] and [[Pontic Greeks]] were killed between 1915 and 1922.<ref>{{cite book |last1=Whitehorn |first1=Alan |title=The Armenian Genocide: The Essential Reference Guide: The Essential Reference Guide |date=2015 |publisher=ABC-CLIO |pages=83, 218 |url=https://books.google.com/books?id=0vrnCQAAQBAJ&pg=PA218 |isbn=978-1-61069-688-3 |access-date=11 November 2018 |archive-date=1 August 2020 |archive-url=https://web.archive.org/web/20200801142141/https://books.google.com/books?id=0vrnCQAAQBAJ&pg=PA218 |url-status=live }}</ref>

=== Prisoners of war ===
{{Main|Prisoners of war in World War I}}
[[File:1stGazaBritishPrisoners00118v.jpg|thumb|British prisoners guarded by Ottoman forces after the [[First Battle of Gaza]] in 1917]]

About 8 million soldiers surrendered and were held in [[Prisoner-of-war camp|POW camps]] during the war. All nations pledged to follow the [[Hague Conventions of 1899 and 1907|Hague Conventions]] on fair treatment of [[Prisoner of war|prisoners of war]], and the survival rate for POWs was generally much higher than that of combatants at the front.{{sfn |Phillimore |Bellot |1919 |pp=4–64}}

Around 25–31% of Russian losses (as a proportion of those captured, wounded, or killed) were to prisoner status; for Austria-Hungary 32%; for Italy 26%; for France 12%; for Germany 9%; for Britain 7%. Prisoners from the Allied armies totalled about 1.4 million (not including Russia, which lost 2.5–3.5 million soldiers as prisoners). From the Central Powers, about 3.3 million soldiers became prisoners; most of them surrendered to Russians.{{sfn|Ferguson|1999|pp=368–369}}

== Soldiers' experiences ==
Allied personnel was around 42,928,000, while Central personnel was near 25,248,000.<ref name="Tucker 2005 2732" />{{Sfn|Tucker|Roberts|2005|p=2733}} British soldiers of the war were initially volunteers but were increasingly [[conscription|conscripted]]. Surviving veterans returning home often found they could discuss their experiences only among themselves, so formed "veterans' associations" or "Legions".
=== Conscription ===
{{Further|Conscription Crisis of 1917|Conscription Crisis of 1918|World War I conscription in Australia|Recruitment to the British Army during World War I|Conscription in the United States#World War I}}
[[File:I want you for U.S. Army 3b48465u edit.jpg|thumb|U.S. Army recruiting poster with [[Uncle Sam]], 1917|upright=.8]]

Conscription was common in most European countries. However, it was controversial in English-speaking countries,{{sfn |Havighurst |1985 |p=131}} It was especially unpopular among minority ethnicities—especially the Irish Catholics in Ireland,<ref>{{cite journal |last=Ward |first=Alan J. |year=1974 |title=Lloyd George and the 1918 Irish conscription crisis |journal=Historical Journal |volume=17 |issue=1 |pages=107–129 |doi=10.1017/S0018246X00005689 |s2cid=162360809}}</ref> Australia,<ref>J.M. Main, ''Conscription: the Australian debate, 1901–1970'' (1970) [http://espace.library.uq.edu.au/view/UQ:338722 abstract] {{webarchive|url=https://archive.today/20150707113023/http://espace.library.uq.edu.au/view/UQ:338722|date=7 July 2015}}</ref><ref name="parl">{{cite news |date=4 May 2015 |title=Commonwealth Parliament from 1901 to World War I |publisher=Parliament of Australia |url=https://www.aph.gov.au/About_Parliament/Parliamentary_Departments/Parliamentary_Library/pubs/rp/rp1415/ComParl |url-status=live |access-date=15 December 2018 |archive-url=https://web.archive.org/web/20181215065914/https://www.aph.gov.au/About_Parliament/Parliamentary_Departments/Parliamentary_Library/pubs/rp/rp1415/ComParl |archive-date=15 December 2018}}</ref> and the French Catholics in Canada.<ref>{{cite news |date=2001 |title=The Conscription Crisis |publisher=CBC |url=http://www.cbc.ca/history/EPISCONTENTSE1EP12CH2PA3LE.html |url-status=live |access-date=14 August 2014 |archive-url=https://web.archive.org/web/20140713134338/http://www.cbc.ca/history/EPISCONTENTSE1EP12CH2PA3LE.html |archive-date=13 July 2014}}</ref><ref>Chelmsford, J.E. "Clergy and Man-Power", ''[[The Times]]'' 15 April 1918, p. 12</ref>

In the US, conscription began in 1917 and was generally well-received, with a few pockets of opposition in isolated rural areas.<ref>{{cite book |last=Chambers |first=John Whiteclay |url=https://archive.org/details/toraisearmydr00cham |title=To Raise an Army: The Draft Comes to Modern America |publisher=The Free Press |year=1987 |isbn=978-0-02-905820-6 |location=New York |url-access=registration}}</ref> The administration decided to rely primarily on conscription, rather than voluntary enlistment, to raise military manpower after only 73,000 volunteers enlisted out of the initial 1 million target in the first six weeks of war.<ref>{{cite book |last=Zinn |first=Howard |title=A People's History of the United States |title-link=A People's History of the United States |publisher=Harper Collins |year=2003 |page=134|isbn=9780060528423}}</ref>

=== Military attachés and war correspondents ===
{{Main|List of military attachés in World War I|List of military attachés and war correspondents in World War I}}

Military and civilian observers from every major power closely followed the course of the war.<ref>{{Cite journal |last=Pedersen |first=Sarah |date=2002-05-01 |title=A Surfeit of Socks? The Impact of the First World War on Women Correspondents to Daily Newspapers |url=https://www.euppublishing.com/doi/10.3366/jshs.2002.22.1.50 |journal=Journal of Scottish Historical Studies |language=en |volume=22 |issue=1 |pages=50–72 |doi=10.3366/jshs.2002.22.1.50 |pmid=19489175 |hdl=10059/294 |issn=1748-538X |access-date=10 June 2024 |archive-date=10 June 2024 |archive-url=https://web.archive.org/web/20240610092046/https://www.euppublishing.com/doi/10.3366/jshs.2002.22.1.50 |url-status=live |hdl-access=free }}</ref> Many were able to report on events from a perspective somewhat akin to modern "[[embedded journalism|embedded]]" positions within the opposing land and naval forces.<ref>{{Cite journal |last=Trumpener |first=Ulrich |date=1987-11-04 |title=The Service Attachés and Military Plenipotentiaries of Imperial Germany, 1871–1918 |url=http://www.tandfonline.com/doi/abs/10.1080/07075332.1987.9640462 |journal=The International History Review |language=en |volume=9 |issue=4 |pages=621–638 |doi=10.1080/07075332.1987.9640462 |issn=0707-5332 |access-date=10 June 2024 |archive-date=1 July 2022 |archive-url=https://web.archive.org/web/20220701113518/https://www.tandfonline.com/doi/abs/10.1080/07075332.1987.9640462 |url-status=live }}</ref><ref>{{Cite journal |last=Craig |first=Gordon A. |date=1949 |title=Military Diplomats in the Prussian and German Service: The Attachés, 1816- 1914 |url=https://www.jstor.org/stable/2144182 |journal=Political Science Quarterly |volume=64 |issue=1 |pages=65–94 |doi=10.2307/2144182 |jstor=2144182 |issn=0032-3195 |access-date=10 June 2024 |archive-date=1 July 2022 |archive-url=https://web.archive.org/web/20220701111521/https://www.jstor.org/stable/2144182 |url-status=live }}</ref>

== Economic effects ==
{{Main|Economic history of World War I|Post–World War I recession}}
{{Further|Home front during World War I|Financial crisis of 1914}}

Macro- and micro-economic consequences devolved from the war. Families were altered by the departure of many men. With the death or absence of the primary wage earner, women were forced into the workforce in unprecedented numbers. At the same time, the industry needed to replace the lost labourers sent to war. This aided the struggle for [[suffragette|voting rights for women]].<ref>{{cite book |last=Noakes |first=Lucy |title=Women in the British Army: War and the Gentle Sex, 1907–1948 |publisher=Routledge |year=2006 |isbn=978-0-415-39056-9 |location=Abingdon, England |page=48}}</ref>[[File:The Girl Behind the Gun 1915.jpg|thumb|Poster showing women workers, 1915]]

In all nations, the government's share of GDP increased, surpassing 50% in both Germany and France and nearly reaching that level in Britain. To pay for purchases in the US, Britain cashed in its extensive investments in American railroads and then began borrowing heavily from [[Wall Street]]. President Wilson was on the verge of cutting off the loans in late 1916 but allowed a great increase in [[Federal government of the United States|US government]] lending to the Allies. After 1919, the US demanded repayment of these loans. The repayments were, in part, funded by German reparations that, in turn, were supported by American loans to Germany. This circular system collapsed in 1931 and some loans were never repaid. Britain still owed the United States $4.4 [[1,000,000,000|billion]]{{efn|10{{sup|9}} in this context&nbsp;– see [[Long and short scales]]}} of World War{{nbsp}}I debt in 1934; the last installment was finally paid in 2015.<ref>{{cite news |last1=Cosgrave |first1=Jenny |date=10 March 2015 |title=UK finally finishes paying for World War I |language=en |work=CNBC |url=https://www.cnbc.com/2015/03/09/uk-finally-finishes-paying-for-world-war-i.html |access-date=20 March 2023 |archive-date=20 March 2023 |archive-url=https://web.archive.org/web/20230320194802/https://www.cnbc.com/2015/03/09/uk-finally-finishes-paying-for-world-war-i.html |url-status=live }}</ref>

Britain turned to her colonies for help in obtaining essential war materials whose supply from traditional sources had become difficult. Geologists such as [[Albert Kitson]] were called on to find new resources of precious minerals in the African colonies. Kitson discovered important new deposits of [[manganese]], used in munitions production, in the [[Gold Coast (region)|Gold Coast]].{{sfn |Green |1938 |p=cxxvi}}

Article 231 of the Treaty of Versailles (the so-called "war guilt" clause) stated Germany accepted responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies."<ref>{{cite book |title=The Weimar Republic Sourcebook |publisher=University of California Press |year=1994 |isbn=978-0-520-90960-1 |editor1=Anton Kaes |page=8 |chapter=The Treaty of Versailles: The Reparations Clauses |access-date=11 December 2015 |editor2=Martin Jay |editor3=Edward Dimendberg |chapter-url=https://books.google.com/books?id=J4A1gt4-VCsC&pg=PA8 |archive-url=https://web.archive.org/web/20160115140046/https://books.google.com/books?id=J4A1gt4-VCsC&pg=PA8 |archive-date=15 January 2016 |url-status=live}}</ref> It was worded as such to lay a legal basis for reparations, and a similar clause was inserted in the treaties with Austria and Hungary. However, neither of them interpreted it as an admission of war guilt.<ref>{{harvnb|Marks|1978|pp=231–232}}</ref> In 1921, the total reparation sum was placed at 132&nbsp;billion gold marks. However, "Allied experts knew that Germany could not pay" this sum. The total sum was divided into three categories, with the third being "deliberately designed to be chimerical" and its "primary function was to mislead public opinion&nbsp;... into believing the 'total sum was being maintained.{{'"}}<ref name="Marks237">{{harvnb|Marks|1978|p=237}}</ref> Thus, 50&nbsp;billion gold marks (12.5&nbsp;billion dollars) "represented the actual Allied assessment of German capacity to pay" and "therefore&nbsp;... represented the total German reparations" figure that had to be paid.<ref name="Marks237" />

This figure could be paid in cash or in-kind (coal, timber, chemical dyes, etc.). Some of the territory lost—via the Treaty of Versailles—was credited towards the reparation figure as were other acts such as helping to restore the Library of Louvain.<ref>{{harvnb|Marks|1978|pp=223–234}}</ref> By 1929, the [[Great Depression]] caused political chaos throughout the world.<ref>{{cite book |last=Stone |first=Norman |title=World War One: A Short History |publisher=Penguin |year=2008 |isbn=978-0-14-103156-9 |location=London}}</ref> In 1932 the payment of reparations was suspended by the international community, by which point Germany had paid only the equivalent of 20.598&nbsp;billion gold marks.<ref>{{harvnb|Marks|1978|p=233}}</ref> With the rise of [[Adolf Hitler]], all bonds and loans that had been issued and taken out during the 1920s and early 1930s were cancelled. [[David A. Andelman|David Andelman]] notes "Refusing to pay doesn't make an agreement null and void. The bonds, the agreement, still exist." Thus, following the Second World War, at the [[London Agreement on German External Debts|London Conference]] in 1953, Germany agreed to resume payment on the money borrowed. On 3{{nbsp}}October 2010, Germany made the final payment on these bonds.{{efn|World War I officially ended when Germany paid off the final amount of reparations imposed on it by the Allies.<ref>{{Cite news |title=First World War officially ends |url=https://www.telegraph.co.uk/news/worldnews/europe/germany/8029948/First-World-War-officially-ends.html |archive-url=https://ghostarchive.org/archive/20220110/https://www.telegraph.co.uk/news/worldnews/europe/germany/8029948/First-World-War-officially-ends.html |archive-date=10 January 2022 |url-access=subscription |url-status=live |website=The Telegraph |access-date=15 March 2017 |quote=<!--The final payment of £59.5&nbsp;million, writes off the crippling debt that was the price for one world war and laid the foundations for another.--> |first=Allan |last=Hall |date=28 September 2010 |location=Berlin}}{{cbignore}}</ref><ref>{{cite news |url=http://www.time.com/time/world/article/0,8599,2023140,00.html |archive-url=https://web.archive.org/web/20101005193702/http://www.time.com/time/world/article/0,8599,2023140,00.html |url-status=dead |archive-date=5 October 2010 |title=Why Did World War I Just End? |last1=Suddath |first1=Claire |date=4 October 2010 |magazine=Time |access-date=1 July 2013 |quote=<!--World War{{nbsp}}I ended over the weekend. Germany made its final reparations-related payment for the Great War on 3 Oct, nearly 92 years after the country's defeat by the Allies.-->}}</ref><ref>{{cite news |url=http://news.blogs.cnn.com/2010/09/30/world-war-i-to-finally-end-this-weekend/ |title=World War I to finally end for Germany this weekend |date=30 September 2010 |work=CNN |access-date=15 March 2017 |quote=<!--Germany and the Allies can call it even on World War I this weekend.--> |archive-date=16 March 2017 |archive-url=https://web.archive.org/web/20170316204156/http://news.blogs.cnn.com/2010/09/30/world-war-i-to-finally-end-this-weekend/ |url-status=dead }}</ref><ref>{{cite news |url=https://www.nytimes.com/2010/12/26/opinion/26macmillan.html |title=Ending the War to End All Wars |date=25 December 2010 |work=The New York Times |access-date=15 March 2017 |quote=<!--NOT many people noticed at the time, but World War I ended this year.--> |first=Margaret |last=MacMillan |archive-date=16 March 2017 |archive-url=https://web.archive.org/web/20170316113814/http://www.nytimes.com/2010/12/26/opinion/26macmillan.html |url-status=live }}</ref>}}

The Australian prime minister, [[Billy Hughes]], wrote to the British prime minister, [[David Lloyd George]], "You have assured us that you cannot get better terms. I much regret it, and hope even now that some way may be found of securing agreement for demanding reparation commensurate with the tremendous sacrifices made by the British Empire and her Allies." Australia received £5,571,720 in war reparations, but the direct cost of the war to Australia had been £376,993,052, and, by the mid-1930s, repatriation pensions, war gratuities, interest and sinking fund charges were £831,280,947.{{sfn |Souter |2000 |p=354}}

== Support and opposition for the war ==

=== Support ===
{{Further|Propaganda in World War I|British propaganda during World War I|Propaganda and censorship in Italy during the First World War}}
[[File:Affiche-guerre Femmes-au-travail.jpg|thumb|upright=0.8|left|Poster urging women to join the British war effort, published by the [[YWCA|Young Women's Christian Association]], 1915]]

In the Balkans, [[Yugoslavism|Yugoslav nationalists]] such as the leader, [[Ante Trumbić]], strongly supported the war, desiring the freedom of [[Yugoslavs]] from Austria-Hungary and other foreign powers and the creation of an independent Yugoslavia. The [[Yugoslav Committee]], led by Trumbić, was formed in Paris on 30 April 1915 but shortly moved its office to London.{{sfn |Tucker |Roberts |2005 |p=1189}} In April 1918, the Rome Congress of Oppressed Nationalities met, including [[Czechoslovakism|Czechoslovak]], Italian, [[Polish people|Polish]], [[Transylvania]]n, and Yugoslav representatives who urged the Allies to support national [[self-determination]] for the peoples residing within Austria-Hungary.<ref name=autogenerated3 />

In the Middle East, [[Arab nationalism]] soared in Ottoman territories in response to the rise of Turkish nationalism during the war, with Arab nationalist leaders advocating the creation of a [[Pan-Arabism|pan-Arab]] state. In 1916, the Arab Revolt began in Ottoman-controlled territories of the Middle East to achieve independence.{{sfn |Tucker |Roberts |2005 |p=117}}

In East Africa, [[Lij Iyasu of Ethiopia|Iyasu V]] of [[Ethiopian Empire|Ethiopia]] was supporting the [[Dervish movement (Somali)|Dervish state]] who were at war with the British in the [[Somaliland campaign]].<ref>{{cite book |last1=Mukhtar |first1=Mohammed |title=Historical Dictionary of Somalia |year=2003 |publisher=Scarecrow Press |page=126 |url=https://books.google.com/books?id=DPwOsOcNy5YC&q=iyasu+dervish&pg=PA126 |access-date=28 February 2017 |isbn=978-0-8108-6604-1 |archive-date=13 April 2021 |archive-url=https://web.archive.org/web/20210413230529/https://books.google.com/books?id=DPwOsOcNy5YC&q=iyasu+dervish&pg=PA126 |url-status=live }}</ref> Von Syburg, the German envoy in [[Addis Ababa]], said, "now the time has come for Ethiopia to regain the coast of the Red Sea driving the Italians home, to restore the Empire to its ancient size." The Ethiopian Empire was on the verge of entering World War{{nbsp}}I on the side of the Central Powers before Iyasu's overthrow at the [[Battle of Segale]] due to Allied pressure on the Ethiopian aristocracy.<ref>{{cite news |title=How Ethiopian prince scuppered Germany's WW1 plans |url=https://www.bbc.com/news/world-37428682 |access-date=28 February 2017 |agency=BBC News |date=25 September 2016 |archive-date=13 April 2020 |archive-url=https://web.archive.org/web/20200413121137/https://www.bbc.com/news/world-37428682 |url-status=live }}</ref>
[[File:BVRC-Great-War-Contingent 1914.jpg|thumb|[[Bermuda Volunteer Rifle Corps]] First Contingent in Bermuda, winter 1914–1915, before joining [[Royal Lincolnshire Regiment|1 Lincolnshire Regiment]] in France in June 1915. The dozen remaining after [[Capture of Gueudecourt|Guedecourt]] on 25 September 1916, merged with a Second Contingent. The two contingents suffered 75% casualties.]]

Several socialist parties initially supported the war when it began in August 1914.<ref name=autogenerated3>{{harvnb |Tucker |Roberts |2005 |p=1001}}</ref> But European socialists split on national lines, with the concept of [[class conflict]] held by radical socialists such as Marxists and [[Syndicalism|syndicalists]] being overborne by their patriotic support for the war.{{sfn |Tucker |Roberts |2005 |p=1069}} Once the war began, Austrian, British, French, German, and Russian socialists followed the rising nationalist current by supporting their countries' intervention in the war.{{sfn|Tucker |Roberts |2005 |p=884}}

[[Italian nationalism]] was stirred by the outbreak of the war and was initially strongly supported by a variety of political factions. One of the most prominent and popular Italian nationalist supporters of the war was [[Gabriele D'Annunzio]], who promoted [[Italian irredentism]] and helped sway the Italian public to support intervention in the war.{{sfn |Tucker |Roberts |2005 |p=335}} The [[Italian Liberal Party]], under the leadership of [[Paolo Boselli]], promoted intervention in the war on the side of the Allies and used the Dante Alighieri Society to promote Italian nationalism.{{sfn |Tucker |Roberts |2005 |p=219}} Italian socialists were divided on whether to support the war or oppose it; some were militant supporters of the war, including [[Benito Mussolini]] and [[Leonida Bissolati]].{{sfn |Tucker |Roberts |2005 |p=209}} However, the [[Italian Socialist Party]] decided to oppose the war after anti-militarist protestors were killed, resulting in a [[general strike]] called [[Red Week (Italy)|Red Week]].<ref name=autogenerated6>{{harvnb |Tucker |Roberts |2005 |p=596}}</ref> The Italian Socialist Party purged itself of pro-war nationalist members, including Mussolini.<ref name=autogenerated6 /> Mussolini formed the pro-interventionist ''[[Il Popolo d'Italia]]'' and the ''Fasci Rivoluzionario d'Azione Internazionalista'' ("Revolutionary [[Fascio|Fasci]] for International Action") in October 1914 that later developed into the ''[[Fasci Italiani di Combattimento]]'' in 1919, the origin of fascism.{{sfn |Tucker |Roberts |2005 |p=826}} Mussolini's nationalism enabled him to raise funds from [[Gio. Ansaldo & C.|Ansaldo]] (an armaments firm) and other companies to create ''Il Popolo d'Italia'' to convince socialists and revolutionaries to support the war.<ref>[[Denis Mack Smith]]. 1997. ''Modern Italy: A Political History''. Ann Arbor: The University of Michigan Press. p. 284.</ref>

==== Patriotic funds ====
On both sides, there was large-scale fundraising for soldiers' welfare, their dependents and those injured. The [[Nail Men]] were a German example. Around the British Empire, there were many patriotic funds, including the [[Royal Patriotic Fund Corporation]], [[Canadian Patriotic Fund]], [[Queensland Patriotic Fund]] and, by 1919, there were 983 funds in New Zealand.<ref>{{Cite web |date=22 Sep 1939 |title=No Immediate Need. Te Awamutu Courier |url=https://paperspast.natlib.govt.nz/newspapers/TAWC19390922.2.37 |access-date=2022-06-16 |website=paperspast.natlib.govt.nz |archive-date=16 June 2022 |archive-url=https://web.archive.org/web/20220616072636/https://paperspast.natlib.govt.nz/newspapers/TAWC19390922.2.37 |url-status=live }}</ref> At the start of the next world war the New Zealand funds were reformed, having been criticised as overlapping, wasteful and abused,<ref>{{Cite web |date=1986 |title=Chapter 4 – Response from the Home Front |url=https://nzetc.victoria.ac.nz/tm/scholarly/tei-WH2-1Hom-c4.html |access-date=2022-06-16 |website=nzetc.victoria.ac.nz |archive-date=6 August 2022 |archive-url=https://web.archive.org/web/20220806215043/https://nzetc.victoria.ac.nz/tm/scholarly/tei-WH2-1Hom-c4.html |url-status=live }}</ref> but 11 were still functioning in 2002.<ref>{{Cite web |date=2005 |title=5.2: Provincial patriotic councils |url=https://oag.parliament.nz/2005/copy_of_2003-04/part5-2.htm |access-date=2022-06-16 |website=Office of the Auditor-General New Zealand |language=en |archive-date=19 May 2022 |archive-url=https://web.archive.org/web/20220519045102/https://oag.parliament.nz/2005/copy_of_2003-04/part5-2.htm |url-status=live }}</ref>

=== Opposition ===
{{Main|Opposition to World War I|1917 French Army mutinies}}

Many countries jailed those who spoke out against the conflict. These included [[Eugene V. Debs|Eugene Debs]] in the US and [[Bertrand Russell]] in Britain. In the US, the [[Espionage Act of 1917]] and [[Sedition Act of 1918]] made it a federal crime to oppose military recruitment or make any statements deemed "disloyal". Publications at all critical of the government were removed from circulation by postal censors,<ref name="Karp-PoW-1979">{{harvnb |Karp |1979}}</ref> and many served long prison sentences for statements of fact deemed unpatriotic.[[File:Sackville Street (Dublin) after the 1916 Easter Rising.JPG|thumb|Sackville Street (now [[O'Connell Street]]) after the 1916 [[Easter Rising]] in Dublin]]

Several nationalists opposed intervention, particularly within states that the nationalists were hostile to. Although the vast majority of Irish people consented to participate in the war in 1914 and 1915, a minority of advanced [[Irish nationalism|Irish nationalists]] had staunchly opposed taking part.<ref>{{cite book |last=Pennell |first=Catriona |title=A Kingdom United: Popular Responses to the Outbreak of the First World War in Britain and Ireland |year=2012 |publisher=Oxford University Press |location=Oxford |isbn=978-0-19-959058-2}}</ref> The war began amid the Home Rule crisis in Ireland that had resurfaced in 1912, and by July 1914 there was a serious possibility of an outbreak of civil war in Ireland. Irish nationalists and Marxists attempted to pursue Irish independence, culminating in the [[Easter Rising]] of 1916, with Germany sending 20,000 rifles to Ireland to stir unrest in Britain.{{sfn |Tucker |Roberts |2005 |p=584}} The British government placed Ireland under [[martial law]] in response to the Easter Rising, though once the immediate threat of revolution had dissipated, the authorities did try to make concessions to nationalist feeling.<ref>O'Halpin, Eunan, ''The Decline of the Union: British Government in Ireland, 1892–1920'', (Dublin, 1987)</ref> However, opposition to involvement in the war increased in Ireland, resulting in the [[Conscription Crisis of 1918]].

Other opposition came from [[conscientious objector]]s—some socialist, some religious—who had refused to fight. In Britain, 16,000 people asked for conscientious objector status.{{sfn |Lehmann |van der Veer |1999 |p=62}} Some of them, most notably prominent peace activist [[Stephen Hobhouse]], refused both military and [[Alternative civilian service|alternative service]].<ref>Brock, Peter, ''These Strange Criminals: An Anthology of Prison Memoirs by Conscientious Objectors to Military Service from the Great War to the Cold War'', p. 14, Toronto: University of Toronto Press, 2004, {{ISBN|978-0-8020-8707-2}}</ref> Many suffered years of prison, including [[solitary confinement]]. Even after the war, in Britain, many job advertisements were marked "No conscientious objectors need to apply".<ref>{{cite web |date=24 February 2014 |title=Winchester Whisperer: The secret newspaper made by jailed pacifists |url=https://www.bbc.com/news/uk-england-25749290 |access-date=7 February 2022 |website=[[BBC News]] |archive-date=7 February 2022 |archive-url=https://web.archive.org/web/20220207220011/https://www.bbc.com/news/uk-england-25749290 |url-status=live }}</ref>

On 1–4 May 1917, about 100,000 workers and soldiers of [[Saint Petersburg|Petrograd]], and after them, the workers and soldiers of other Russian cities, led by the Bolsheviks, demonstrated under banners reading "Down with the war!" and "all power to the Soviets!". The mass demonstrations resulted in a crisis for the [[Russian Provisional Government]].<ref>{{cite book|author=Richard Pipes|title=The Russian Revolution|url=https://books.google.com/books?id=XtE54LuhFzEC&pg=PA407|year=1990|publisher=Knopf Doubleday|page=407|isbn=978-0-307-78857-3|access-date=30 July 2019|archive-date=1 August 2020|archive-url=https://web.archive.org/web/20200801164146/https://books.google.com/books?id=XtE54LuhFzEC&pg=PA407|url-status=live}}</ref> In [[Milan]], in May 1917, Bolshevik revolutionaries organised and engaged in rioting calling for an end to the war, and managed to close down factories and stop public transportation.<ref name="Seton_6">Seton-Watson, Christopher. 1967. ''Italy from Liberalism to Fascism: 1870 to 1925''. London: Methuen & Co. Ltd. p. 471</ref> The Italian army was forced to enter Milan with tanks and machine guns to face Bolsheviks and [[Anarchism|anarchists]], who fought violently until May 23 when the army gained control of the city. Almost 50 people (including three Italian soldiers) were killed and over 800 people were arrested.<ref name="Seton_6" />

== Technology ==
{{See also|Technology during World War I}}
[[File:Sopwith F-1 Camel.jpg|thumb|[[Royal Air Force]] [[Sopwith Camel]]. In April 1917, the average life expectancy of a British pilot on the Western Front was 93 flying hours.<ref>{{cite book |last1=Lawson |first1=Eric |url={{google books |plainurl=y |id=9PGHckhHiX0C}}pg=PT123 |title=The First Air Campaign: August 1914 – November 1918 |last2=Lawson |first2=Jane |publisher=Da Capo Press |year=2002 |isbn=978-0-306-81213-2 |page=123 }}{{Dead link|date=February 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>]]

World War I began as a clash of 20th-century technology and 19th-century [[military tactics|tactics]], with the inevitably large ensuing casualties. By the end of 1917, however, the major armies had modernised and were making use of telephone, [[Wireless|wireless communication]],{{sfn |Hartcup |1988 |p=154}} [[Armored car (military)|armoured cars]], [[tank]]s (especially with the advent of the prototype tank, [[Little Willie]]), and aircraft.{{sfn |Hartcup |1988 |pp=82–86}}
[[Image:Marcel Louis Courmes en fourrure 1915.jpg|thumb|right|[[Marcel Courmes|Captain Marcel Courmes]], pilot of the French 2nd Bombardment, Group GB 2, in August 1915]]
Artillery also underwent a revolution. In 1914, cannons were positioned in the front line and fired directly at their targets. By 1917, [[indirect fire]] with guns (as well as mortars and even machine guns) was commonplace, using new techniques for spotting and ranging, notably, aircraft and the [[field telephone]].<ref>Sterling, Christopher H. (2008). ''Military Communications: From Ancient Times to the 21st Century''. Santa Barbara: ABC-CLIO. {{ISBN|978-1-85109-732-6}} p. 444.</ref>

[[Fixed-wing aircraft]] were initially used for [[reconnaissance]] and [[Close air support|ground attack]]. To shoot down enemy planes, [[Anti-aircraft warfare|anti-aircraft guns]] and [[fighter aircraft]] were developed. [[Strategic bomber]]s were created, principally by the Germans and British, though the former used [[Zeppelin]]s as well.<ref name="Cross 1991">{{harvnb|Cross|1991}}</ref> Towards the end of the conflict, [[aircraft carrier]]s were used for the first time, with HMS ''Furious'' launching [[Sopwith Camel]]s in a raid to destroy the Zeppelin hangars at [[Tønder]] in 1918.{{sfn|Cross|1991|pp=56–57}}

== Diplomacy ==
{{Main|Diplomatic history of World War I}}
[[File:Cartoon for a Telegram.jpg|thumb|1917 political cartoon about the [[Zimmermann Telegram]]]]

The non-military diplomatic and propaganda interactions among the nations were designed to build support for the cause or to undermine support for the enemy. For the most part, wartime diplomacy focused on five issues: [[Propaganda in World War I|propaganda campaigns]]; defining and redefining the war goals, which became harsher as the war went on; luring neutral nations (Italy, Ottoman Empire, Bulgaria, Romania) into the coalition by offering slices of enemy territory; and encouragement by the Allies of nationalistic minority movements inside the Central Powers, especially among Czechs, Poles, and Arabs. In addition, multiple peace proposals were coming from neutrals, or one side or the other; none of them progressed very far.{{sfn |Stevenson |1988 |p={{page needed|date=July 2020}}}}<ref>{{cite book |first=Z. A. B. |last=Zeman |title=Diplomatic History of the First World War |url=https://archive.org/details/diplomatichistor0000zema |url-access=registration |location=London |publisher=Weidenfeld and Nicolson |year=1971 |isbn=978-0-297-00300-7 }}</ref><ref>See {{cite book |author=Carnegie Endowment for International Peace |title=Official Statements of War Aims and Peace Proposals: December 1916 to November 1918 |editor-first=James Brown |editor-last=Scott |year=1921 |url=https://archive.org/details/cu31924016943106 |publisher=Washington, D.C., The Endowment }}</ref>

== Legacy and memory ==
{{Main|List of last surviving World War I veterans|Commonwealth War Graves Commission|American Battle Monuments Commission}}
{{Further|World War I in popular culture}}

=== Memorials ===
{{Main|World War I memorials}}
[[File:Sacrario militare di Redipuglia agosto 2014.JPG|thumb|right|The Italian [[Redipuglia War Memorial]], which contains the remains of 100,187 soldiers]]

Memorials were built in thousands of villages and towns. Close to battlefields, those buried in improvised burial grounds were gradually moved to formal graveyards under the care of organisations such as the [[Commonwealth War Graves Commission]], the [[American Battle Monuments Commission]], the [[German War Graves Commission]], and [[Le Souvenir français]]. Many of these graveyards also have monuments to the missing or [[Tomb of the Unknown Soldier|unidentified]] dead, such as the [[Menin Gate|Menin Gate Memorial to the Missing]] and the [[Thiepval Memorial|Thiepval Memorial to the Missing of the Somme]].<ref>{{cite web |title=Memorials to the Missing of the First and Second World Wars |url=https://www.dva.gov.au/recognition/commemorations/memorials/memorials-missing |website=Department of Veterans' Affairs |date=10 October 2023 |publisher=Commonwealth of Australia |access-date=1 March 2024 |archive-date=1 March 2024 |archive-url=https://web.archive.org/web/20240301154418/https://www.dva.gov.au/recognition/commemorations/memorials/memorials-missing |url-status=live }}</ref><ref>{{cite web |title=Thiepval Anglo-French Cemetery |url=https://www.cwgc.org/visit-us/find-cemeteries-memorials/cemetery-details/67300/thiepval-anglo-french-cemetery/ |website=Commonwealth War Graves Commission |access-date=1 March 2024 |archive-date=14 October 2023 |archive-url=https://web.archive.org/web/20231014125355/https://www.cwgc.org/visit-us/find-cemeteries-memorials/cemetery-details/67300/thiepval-anglo-french-cemetery/ |url-status=live }}</ref>

In 1915, [[John McCrae]], a Canadian army doctor, wrote the poem ''[[In Flanders Fields]]'' as a salute to those who perished in the war. It is still recited today, especially on [[Armistice Day|Remembrance Day]] and [[Memorial Day]].<ref>{{cite journal |year=1918 |title=John McCrae |journal=Nature |publisher=Historica |volume=100 |issue=2521 |pages=487–488 |bibcode=1918Natur.100..487. |doi=10.1038/100487b0 |s2cid=4275807 |doi-access=free}}</ref><ref>{{cite journal |last=David |first=Evans |year=1918 |title=John McCrae |url=https://www.thecanadianencyclopedia.ca/en/article/john-mccrae |url-status=live |journal=Nature |volume=100 |issue=2521 |pages=487–488 |bibcode=1918Natur.100..487. |doi=10.1038/100487b0 |s2cid=4275807 |archive-url=https://web.archive.org/web/20160304072732/http://www.thecanadianencyclopedia.com/en/article/john-mccrae/ |archive-date=4 March 2016 |access-date=8 June 2014 |doi-access=free}}</ref>
[[File:Pagny le Chateau monument morts 002b.jpg|thumb|A typical village [[war memorial]] to soldiers killed in World War I]]
[[National World War I Museum and Memorial]] in [[Kansas City, Missouri]], is a memorial dedicated to all Americans who served in World War{{nbsp}}I. The [[National World War I Museum and Memorial|Liberty Memorial]] was dedicated on 1 November 1921.<ref name="kclibrary.org">{{cite web |date=21 September 2015 |title=Monumental Undertaking |url=http://www.kclibrary.org/blog/week-kansas-city-history/monumental-undertaking |url-status=live |archive-url=https://web.archive.org/web/20150529002033/http://www.kclibrary.org/blog/week-kansas-city-history/monumental-undertaking |archive-date=29 May 2015 |access-date=23 May 2015 |website=kclibrary.org}}</ref>

The British government budgeted substantial resources to [[First World War centenary|the commemoration of the war during the period 2014 to 2018]]. The lead body is the [[Imperial War Museum]].<ref>{{cite web |title=Commemoration website |url=http://www.1914.org |url-status=dead |archive-url=https://web.archive.org/web/20140208062818/http://www.1914.org/ |archive-date=8 February 2014 |access-date=28 February 2014 |publisher=1914.org}}</ref> On 3{{nbsp}}August 2014, French President [[François Hollande]] and German President [[Joachim Gauck]] together marked [[Centenary of the outbreak of World War I|the centenary of Germany's declaration of war on France]] by laying the first stone of a memorial in Vieil Armand, known in German as [[Hartmannswillerkopf]], for French and German soldiers killed in the war.<ref name="HartmannswillerkopfMemorial">{{Cite news |title=French, German Presidents Mark World War I Anniversary |publisher=France News.Net |url=https://www.francenews.net/news/224398825/french-german-presidents-mark-world-war-i-anniversary |url-status=live |access-date=3 August 2014 |archive-url=https://web.archive.org/web/20170403005503/http://www.francenews.net/news/224398825/french-german-presidents-mark-world-war-i-anniversary |archive-date=3 April 2017}}</ref> As part of commemorations for the [[centenary of the Armistice of 11 November 1918|centenary of the 1918 Armistice]], French President [[Emmanuel Macron]] and German Chancellor [[Angela Merkel]] visited the site of the signing of the Armistice of Compiègne and unveiled a plaque to reconciliation.<ref>{{Cite news |date=10 November 2018 |title=Armistice Day: Macron and Merkel mark end of World War One |publisher=BBC News |url=https://www.bbc.com/news/world-europe-46165903 |url-status=live |access-date=30 March 2021 |archive-url=https://web.archive.org/web/20201210194001/https://www.bbc.com/news/world-europe-46165903 |archive-date=10 December 2020}}</ref>

=== Historiography ===
{{Main|Historiography of World War I}}
{{Further|Historiography of the causes of World War I}}
{{blockquote |<poem>...&nbsp;"Strange, friend," I said, "Here is no cause to mourn."
"None," said the other, "Save the undone years"...&nbsp;</poem> |[[Wilfred Owen]], ''Strange Meeting'', 1918<ref name="Wilfred Owen 2004">''Wilfred Owen: poems'', 1917, (Faber and Faber, 2004)</ref>}}

The first efforts to comprehend the meaning and consequences of [[modern warfare]] began during the initial phases of the war and are still underway more than a century later. Teaching World War I has presented special challenges. When compared with [[World War II]], the First World War is often thought to be "a wrong war fought for the wrong reasons"; it lacks the [[metanarrative]] of [[Good and evil|good versus evil]] that characterizes retellings of the Second World War. Lacking recognizable heroes and villains, it is often taught thematically, invoking simplified [[Trope (literature)|tropes]] that obscure the complexity of the conflict.<ref name="Neiberg2">{{cite book |last=Neiberg |first=Michael |title=The World War I Reader |date=2007 |page=1}}</ref>

Historian Heather Jones argues that the [[historiography]] has been reinvigorated by a cultural turn in the 21st century. Scholars have raised entirely new questions regarding [[military occupation]], [[Radicalization|radicalisation]] of politics, [[Race (human categorization)|race]], [[medical science]], [[Gender history|gender]] and [[mental health]]. Among the major subjects that historians have long debated regarding the war include: [[Historiography of the causes of World War I|Why the war began]]; why the [[Allies of World War I|Allies]] won; whether generals were responsible for [[World War I casualties|high casualty rates]]; how soldiers endured the poor conditions of [[trench warfare]]; and to what extent the civilian [[Home front during World War I|home front]] accepted and endorsed the war effort.<ref>{{cite journal |last=Jones |first=Heather |year=2013 |title=As the centenary approaches: the regeneration of First World War historiography |journal=[[Historical Journal]] |volume=56 |issue=3 |pages=857–878 [858] |doi=10.1017/S0018246X13000216 |doi-access=free}}</ref><ref>see Christoph Cornelissen, and Arndt Weinrich, eds. ''Writing the Great War – The Historiography of World War I from 1918 to the Present'' (2020) [https://www.berghahnbooks.com/title/CornelissenWriting free download] {{Webarchive|url=https://web.archive.org/web/20201129075020/https://berghahnbooks.com/title/CornelissenWriting|date=29 November 2020}}; full coverage for major countries.</ref>

=== Unexploded ordnance ===
{{Further|Zone rouge|Iron harvest}}

As late as 2007, [[unexploded ordnance]] at battlefield sites like [[Verdun]] and [[Somme (department)|Somme]] continued to pose a danger. In France and Belgium, locals who discover caches of unexploded munitions are assisted by weapons disposal units. In some places, plant life has still not recovered from the effects of the war.<ref name="Neiberg2"/>

== See also ==
* [[Lists of World War I topics]]
* [[List of military engagements of World War I]]
* [[Outline of World War I]]
* [[World war]]
* [[World War II]]
* [[Freemasonry during World War I]]
* [[List of wars by death toll]]

== Footnotes ==
{{Notelist}}

== References ==
{{reflist|25em}}

== Bibliography ==
<!--This list is too long already, please make any additions in the linked list articles rather than here.-->
<!--DO ''not'' SIMPLY ADD BOOKS ABOUT WORLD WAR I HERE—ADD THEM TO "LIST OF WORLD WAR I BOOKS".-->
{{For|a comprehensive bibliography|Bibliography of World War I}}

{{Refbegin|30em}}
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{{Refend}}

== External links ==
{{Spoken Wikipedia|date=24 June 2006 |World War I (part 1).ogg |World War I (part 2).ogg |World War I (part 3).ogg}}
{{Sister project links|voy=World War I|World War I}}
* [https://wwi.lib.byu.edu/index.php/Links_to_Other_WWI_Sites Links to other WWI Sites], worldwide links from Brigham Young U.
* [https://wwi.lib.byu.edu/ The World War One Document Archive], from Brigham Young U.
* [http://www.1914-1918-online.net/#:~:text=International%20Encyclopedia%20of%20the%20First%20World%20War%20%E2%80%9D,authors%2C%20editors%2C%20and%20partners%20from%20over%20fifty%20countries. International Encyclopedia of the First World War]
* [https://www.parliament.uk/about/living-heritage/transformingsociety/private-lives/yourcountry/collections/the-outbreak-of-the-first-world-war/ Records on the outbreak of World War I from the UK Parliamentary Collections]
* [http://www.greatwar.nl/ The Heritage of the Great War / First World War. Graphic colour photos, pictures and music]
* [http://www.firstworldwar.com/ A multimedia history of World War I]
* European Newspapers from the [http://www.theeuropeanlibrary.org/tel4/newspapers/search?query=&decade=1910-1919&month=7&year=1914&&count=50 start of the First World War] and the [http://www.theeuropeanlibrary.org/tel4/newspapers/search?query=&decade=1910-1919&month=11&year=1918&count=50 end of the war]
* [http://www.europeanfilmgateway.eu/node/33/efg1914/multilingual%3A1 WWI Films on the European Film Gateway]
* [http://www.britishpathe.com/workspaces/page/ww1-the-definitive-collection The British Pathé WW1 Film Archive] {{Webarchive|url=https://web.archive.org/web/20190324234810/http://www.britishpathe.com/workspaces/page/ww1-the-definitive-collection |date=24 March 2019 }}
* [http://digitalcollections.library.ubc.ca/cdm/landingpage/collection/WWIphoto World War I British press photograph collection] – A sampling of images distributed by the British government during the war to diplomats overseas, from the UBC Library Digital Collections
* [http://memory.loc.gov/diglib/vhp/search?query=&field=all&war=worldwari Personal accounts of American World War I veterans], Veterans History Project, [[Library of Congress]]
* Who is at fault for World War I? (YouTube Premium): [https://www.youtube.com/watch?v=37QFb-LRd9Q ''Link'']

=== Library guides ===
* [http://natlib.govt.nz/researchers/guides/first-world-war National Library of New Zealand]
* [http://guides.sl.nsw.gov.au/wwi-and-australia State Library of New South Wales]
* [https://www.loc.gov/rr/program/bib/wwi/wwi.html US Library of Congress]
* [http://libraries.iub.edu/guide-world-war-i-resources Indiana University Bloomington] {{Webarchive|url=https://web.archive.org/web/20150605065400/http://libraries.iub.edu/guide-world-war-i-resources |date=5 June 2015 }}
* [http://guides.nyu.edu/content.php?pid=568692 New York University] {{Webarchive|url=https://web.archive.org/web/20150405020007/http://guides.nyu.edu/content.php?pid=568692 |date=5 April 2015 }}
* [https://web.archive.org/web/20141020223852/http://guides.library.ualberta.ca/worldwar1914 University of Alberta]
* [https://oac.cdlib.org/search?style=oac4;Institution=California%20State%20Library::California%20History%20Room;idT=AEK-6409 California State Library, California History Room. Collection: California. State Council of Defense. California War History Committee. Records of Californians who served in World War I, 1918–1922.]

{{World War I}}
{{WWI history by nation}}
{{Balkan Wars}}
{{Great Power diplomacy}}
{{Western world}}
{{Eastern world}}
{{Authority control}}

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