Seavey's Island side of Seavey's Island at the former site of Camp Long, a stockade named for Secretary of the Navy John Long, where 1,612 prisoners of war from the Battle of Santiago de Cuba were confined from July 11 to mid-September 1898 during the Spanish–American War. Camp Heywood, a Marine camp named after Colonel Charles Heywood, was located just north of the naval prison. It was occupied after the 1st Battalion's return from Cuba in late August until September 21, 1898. According to the National Trust for Historic Preservation, the Portsmouth Naval Shipyard has 62 buildings listed on the National Register
USS Santiago de Cuba (1861) USS Santiago de Cuba (1861) USS "Santiago de Cuba" (1861) was a brig acquired by the Union Navy during the first year of the American Civil War. She was outfitted as a gunboat with powerful 20-pounder rifled guns and 32-pounder cannon and was assigned to the Union blockade of the Confederate States of America. USS "Santiago de Cuba" was a wooden, brigantine-rigged, side-wheel steamship built in 1861 at Brooklyn, New York. She was purchased by the Navy on 6 September 1861 at New York City; and was commissioned at the New York Navy Yard on 5 November 1861, Commander Daniel