Fort Lévis, a fortification on the St. Lawrence River, was built in 1759 by the French. They had decided that Fort de La Présentation was insufficient to defend their St. Lawrence River colonies against the British. Named for François Gaston de Lévis, Duc de Lévis, the fort was constructed on Isle Royale, 3 miles (4.8 km) downstream from the other fort. The fort surrendered after intense bombardment in August 1760 to the British and was renamed Fort William Augustus. The fort was abandoned in 1766. During the construction of the Saint Lawrence Seaway, the remains of the fort were destroyed and submerged beneath the waters of the river.