After the war, the federal government declared Fort Andrew an inactive military reservation in 1869.

[2] Gurnet Fort was built in 1776 for the American Revolutionary War, via a resolution of the Massachusetts General Court of June 3, 1776.

[3] In 1776, HMS Niger briefly engaged Gurnet Fort while searching for patriot privateers.

In 1811 the entry reads: "At the Gurnet Point, the entrance of the harbor; the old fort has been repaired with stone and sods, mounting five heavy guns...".

[6] The seven guns installed during the Civil War consisted of four eight-inch (203 mm) smoothbores and three 32-pounder rifled pieces.

[2] The use of the site prior to the government's acquisition is unknown, but it currently contains a residential area, a Coast Guard facility, and a lighthouse.

By 30 June 1867, the fort possessed an additional light field piece installed on a temporary firing platform, which was removed by April 1880.