- 1812 18 Jun The War of 1812 begins as the US declares war on Britain over the interdiction of trade with France.
- 1815 18 Jun Wellington decisively defeats Napoleon at the Battle of Waterloo, ending 25 years of war in Europe.
- 1900 18 Jun Empress Dowager Cixi orders the killing of all foreigners in China, in support of the 'Boxer' rebellion.

