Courtesy of the Library of Congress. Call number: PH - Riddle, no. 7 (AA size). Photograph shows group of huts in an area referred to as "Mud Island" next to "dead-line" where prisoners would be shot if they entered it; in the middle group stands a man wearing only a shirt, common attire for elderly prisoners (Source: Notes by Sergeant Warren L. Goss of Co. H, 2nd Massachusetts Heavy Artillery Regiment, prisoner who aided the photographer at Gilder Lehrman Institute of American History. Goss, Warren (fl. ca. 1864-1880).