- The American Revolutionary War began with the Battles of Lexington and Concord in April 1775 where American militias engaged British troops.
- In May 1775, Ethan Allen led the Green Mountain Boys in capturing Fort Ticonderoga, obtaining cannons and guns for the American forces.
- The Second Continental Congress formed the Continental Army with George Washington as its commander and appealed to King George III to repeal the Intolerable Acts, but prepared for war if necessary.