Final answer:
After Lexington and Concord, New England mobilized for war and militias from all over marched to Boston. Rebels captured Fort Ticonderoga and brought cannons to Boston.
Step-by-step explanation:
After the battles of Lexington and Concord, New England fully mobilized for war. Thousands of militias from towns throughout New England marched to Boston, and soon the city was besieged by a sea of rebel forces. In May 1775, Ethan Allen and Colonel Benedict Arnold led a group of rebels against Fort Ticonderoga in New York. They succeeded in capturing the fort, and cannons from Ticonderoga were brought to Boston to aid the rebel forces.
Learn more about Colonists' reaction to Lexington and Concord