Fort Erie was the site of the bloodiest battles during the War of 1812. This new fort was unfinished when the United States declared war on June 18, 1812. Part of the garrison of Fort Erie fought at the Battle of Frenchman's Creek against an American attack in November 1812. In 1813, Fort Erie was held for a period by U.S. forces and then abandoned on June 9, 1813. The fort had been partially dismantled by the small garrison of British troops and Canadian Militia as they withdrew.