Final answer:
The capture of Fort Ticonderoga in the winter of 1775 by Ethan Allen and the Green Mountain Boys was a critical event for the American Revolution, providing the Continental Army with artillery that was instrumental in the siege of Boston.
Step-by-step explanation:
The important event that happened at Fort Ticonderoga in the winter of 1775 was its capture by Ethan Allen and the Green Mountain Boys. This victory was significant for the Continental Army because the cannons seized from the fort were later used by General George Washington to compel the British to evacuate Boston, signifying an early and strategic win for the American forces in the Revolutionary War.
During the early stages of the war, the capture of Fort Ticonderoga provided the colonial forces with much-needed artillery. These cannons were transported from Ticonderoga to Boston where they were critical in the successful siege against the British. The event not only boosted American morale but also marked an early turning point in the war. The capture of Fort Ticonderoga is a celebrated moment in American history, symbolizing clever strategy and the determination of the rebel forces.