- Jun 8 39 German states unite under Act of Confederation
- Jun 9 End of the Congress of Vienna: New European political situation is set
- Jun 16 Battle at Quatre-Bras: Duke of Wellington's English forces engage the French in a preliminary battle two days before the Battle of Waterloo
- Jun 16 French army under Napoleon defeats Prussia in the Battle of Ligny, Napoleon's last military victory
- Jun 17 American frigate USS Guerriere captained by Stephen Decatur captures Algerian frigate Mashouda, killing its famous captain corsair Raïs Hamidou during US-Algerian War
Battle of Waterloo
Jun 18 Battle of Waterloo; Napoleon Bonaparte and France defeated by British forces under Duke of Wellington and Prussian troops under Field Marshall von Blücher
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