 From April 1816 to March 1821 Fort Sewall was garrisoned by Company B of the Light Artillery Regiment with about 60 soldiers.The fort fell into ruins after the War of 1812.During the Civil War, Massachusetts militia troops were garrisoned at Fort Sewall, 12 pieces of artillery were mounted to defend Marblehead Harbor with the fort rebuilt accordingly, and a few Confederate prisoners of war were held there.