User:Hawkeye7/War/Selected anniversaries/October 23
- 42 BC - Roman Republican civil wars: Second Battle of Philippi - Brutus's army is decisively defeated by Mark Antony and Octavian. He commits suicide.
- 1086 - At the Battle of az-Zallaqah, the army of Yusuf ibn Tashfin defeats the forces of Castilian King Alfonso VI.
- 1739 - War of Jenkins' Ear starts: British Prime Minister, Robert Walpole, reluctantly declares war on Spain.
- 1864 - American Civil War: Battle of Westport - Union forces under General Samuel R. Curtis defeat Confederate troops led by General Sterling Price at Westport, near Kansas City.
- 1911 - First use of aircraft in war: an Italian pilot takes off from Libya to survey Turkish lines during the Turco-Italian War.