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Siege of Boston

Early in 1775, in response to the growing rebellious movement, London sent British troops to occupy Boston, led by General Thomas Gage, commander of British forces in America. They set up fortifications, making the city impervious to attack. Local militias surrounded the city and effectively trapped the British troops, resulting in a standoff.

As Washington headed for Boston, word of his march preceded him, and he was greeted everywhere; gradually, he became a symbol of the Patriot cause. Upon Washington's arrival on July 2, 1775, two weeks after the Battle of Bunker Hill, he set up headquarters in Cambridge. When he went to inspect the army, he found undisciplined militia. After consultation, he initiated Benjamin Franklin 's suggested reforms: drilling the soldiers and imposing strict discipline. Washington ordered his officers to identify the skills of recruits to ensure military effectiveness, while removing incompetent officers. He petitioned Gage, his former superior, to release captured Patriot officers from prison and treat them humanely. In October 1775, King George III declared that the colonies were in open rebellion and relieved Gage of command for incompetence, replacing him with General William Howe.

The Continental Army, reduced to only 9,600 men by January 1776 due to expiring short-term enlistments, had to be supplemented with militia. Soon, they were joined by Knox with heavy artillery captured from Fort Ticonderoga. When the Charles River froze over, Washington was eager to cross and storm Boston, but General Gates and others were opposed to untrained militia striking well-garrisoned fortifications. Instead, he agreed to secure the Dorchester Heights, 100 feet (30 m) above Boston, with Knox's artillery to try to force the British out.

On March 9, under cover of darkness, Washington's troops bombarded British ships in Boston harbor. On March 17, 9,000 British troops and Loyalists began a chaotic ten-day evacuation aboard 120 ships. Soon after, Washington entered the city with 500 men, with explicit orders not to plunder the city. He refrained from exerting military authority in Boston, leaving civilian matters in the hands of local authorities.