Boston Evacuation Day, observed on March 17, commemorates the day in 1776 when British troops evacuated Boston during the American Revolutionary War. The evacuation followed the successful Siege of Boston by American forces, particularly after the Continental Army, led by General George Washington, fortified positions on Dorchester Heights, overlooking the city. The British, under General William Howe, found themselves unable to hold the city and were forced to retreat.

This event marked a crucial turning point in the Revolutionary War, as it was the first major victory for the American forces and a significant blow to British morale. The evacuation occurred without major fighting, but it symbolized the weakening of British control in the American colonies.

Evacuation Day became an annual celebration in Boston, especially in the 19th and early 20th centuries, with parades, speeches, and events honoring the American victory. Though the celebration has diminished over time, the day remains a symbol of Boston’s pivotal role in the early stages of the American Revolution.