In 1774 the British took over the island and in 1775 the harbor was blocked and the lighthouse became useless. On July 20, 1775, a small detachment of American troops under Major Voss visited the island and burned the wooden parts of the lighthouse. The British began to repair it under a marine guard when General Washington dispatched Major Benjamin Tupper with 300 men in whaleboats on July 31, 1775, who defeated the guard and destroyed the repair work done. They were intercepted on leaving by British small boats and attacked. A direct hit on one of the British boats by an American field piece on Nantasket Head caused the British to retire to their boats with comparatively heavy losses. Only one American was killed. Major Tupper and his men were commended by General Washington.