On May 10, 1775, a surprise dawn attack led by Ethan Allen and Benedict Arnold successfully captured the lightly defended fort from a small British garrison of roughly 50 men. This event marked the first offensive victory for American forces, securing the strategic “Gibraltar of North America” and providing critical artillery used later to break the Siege of Boston. The Americans seized 78 cannons, 6 mortars, and vast supplies of ammunition, which were transported to Boston by Colonel Henry Knox.










