Two important cemeteries for the dead from the Confederate States Army can be found in the Buckeye State. One is at the prisoner-of-war camp on Johnson's Island, the most significant Civil War site in the state and intended mostly for officers. Estimates are that 10,000–15,000 Confederate officers and soldiers were incarcerated during the camp's three years of operations, with 2,500–3,000 at any one time. About 300 Confederates died and were buried there. A museum about Johnson's Island is located in Marblehead on the mainland. The Civil War buildings were dismantled shortly after the war. Archeological work by Heidelberg University has revealed the boundaries of the camp and new materials. At one time part of the island was used for a pleasure resort. Another cemetery is located at Camp Chase, where more than 2,000 Southerners were interred. Union Cemetery in Steubenville, Ohio, is the final resting place of Civil War soldiers, including several generals and colonels, including several of the "Fighting McCooks".