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 "Iowa". This man proved to be Captain Don Antonio Eulate of "Vizcaya". He thanked his rescuers and presented his sword to Captain Robley Evans, who handed it back as an act of chivalry. By the end of the battle, the Spanish fleet was completely destroyed. The Spanish lost more than 300 killed and 150 wounded out of 2,227 men, or approximately 22% of the fleet. 1,800 officers and men were taken prisoner by the Americans and roughly 150 returned to Santiago de Cuba. The American fleet lost only one killed and one wounded, the former being Yeoman George Henry Ellis