Fort Mississauga National Historic Site is a fort on the shore of Lake Ontario, at the mouth of the Niagara River in Niagara-on-the-Lake, Ontario, Canada. The fort today consists of a box–shaped brick tower and historic star–shaped earthworks. The all–brick fort was built from 1814–1816 during the War of 1812, to replace nearby Fort George. It was built on a foundation of brick and stone salvaged from rubble left after retreating United States forces burned the nearby town of Newark (as Niagara-on-the-Lake was known then) in December, 1813. It would help in the defence of Upper Canada the following year, as part of a regional network that included Fort George, Navy Hall, and Butler's Barracks. However, the fort would not be completed until after the war.