 On August 15, 1864 the 11th Company was relieved by the 20th Unattached Company (formerly Company E, 4th Regiment Massachusetts Volunteer Militia) which also garrisoned the fort at Salisbury Point in the town of Salisbury.The 20th Company was mustered out shortly after the end of the war on June 29, 1865.Fort Sewall was seen as no longer needed as a coast defense fort following the Civil War.