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The Capture of Fort William and Mary took place in New Hampshire on December 14, 1774, when local Patriots from the Portsmouth area, led by John Langdon, stormed Fort William and Mary (overcoming a six-man caretaker detachment) and seized the garrison's powder, which was distributed through several towns in the colony for potential use in the looming struggle against Great Britain. On December 15, 1774, patriots led by John Sullivan again raided the fort, this time seizing numerous cannons.