- Jun 4 Louisiana Territory officially renamed "Missouri Territory"
Assassination of Spencer Perceval
Jun 8 Robert Jenkinson becomes Prime Minister of the United Kingdom after Spencer Perceval's assassination
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- Jun 18 War of 1812 begins as US declares war against Britain
Victory in Battle
Jun 22 Upon learning of plans by the Americans to execute a surprise attack, Laura Secord walks 32 km to warn British troops, results in a British surprise victory at the Battle of Beaver Dams
Laura Secord
Event of Interest
Jun 24 Napoleon Bonaparte's Grand Armée numbering half a million begin their invasion of Russia by crossing the Nieman River
Napoléon Bonaparte