Although the Siege of Boston lasted for almost an entire year, the British were finally forced to leave Boston, Massachusetts on March 17, 1776 during the American Revolution in Massachusetts.
The British troops were forced to leave after the continental army heavily fortified Dorchester Heights with cannons taken from Fort Ticonderoga, which resulted in the Battle of Dorchester Heights.
How Did the Siege of Boston Start?
The Siege of Boston began when British forces retreated back to Boston after the Battle of Concord, where the Shot Heard Round the World took place, on April 19, 1775.
As the British retreated back into the city, militiamen blocked off the thin land bridges to Boston and Charlestown, called Boston neck and Charlestown neck, to prevent the British troops from conducting anymore raids on the nearby countryside.
