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
Battle of Santiago de Cuba and were lost. , abandoned in Santiago Bay because of engine troubles, was an unprotected cruiser captured by the U.S. Navy and used as a receiving ship until 1957 as . All of the various flags, warship pennants, national combat flags, the royal standard, admirals' flags and so on retrieved from the Spanish ships in the days following the battle, are part of the United States Navy Trophy Flag Collection at the U.S. Naval Academy Museum in Annapolis, Maryland. The collection was given to the care of the U.S. Naval Academy by an act of Congress in 1949. In 1998,