For America250, which 1776 siege ended with the British evacuation of Boston?

For America250, the Siege of Boston ended with the British evacuation of Boston in 1776.

The siege began after the Battles of Lexington and Concord in April 1775, when colonial forces surrounded Boston and trapped the British army in the city. The conflict lasted nearly eleven months and became the opening major campaign of the American Revolutionary War.

The turning point came when American forces captured Dorchester Heights on March 4–5, 1776. Henry Knox had transported heavy cannon from Fort Ticonderoga, and the guns were positioned overlooking Boston and its harbor. British commander William Howe concluded that holding the city was too dangerous.

British troops evacuated Boston on March 17, 1776, sailing to Halifax, Nova Scotia. The event occurred before the Declaration of Independence and is therefore part of the military crisis that led to the independence decision later that year.