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 Spain. On April 25, the United States declared war. America claimed to have had no self-serving interest in Cuba, but some political and military leaders and imperialists did believe the war would be an opportunity for the United States to expand territories overseas and to demonstrate its increasing naval power against a weak foe. Moreover, the United States sought to expand economic ties with Cuba for its resources in sugar and tobacco, all of which influenced America's decision to intervene. It was evident that gaining territories across the globe would increase the strength and influence of the United States and