Coordinates: 32°43′07″N 79°53′05″W / 32.71861°N 79.88472°W / 32.71861; -79.88472
Fort Wagner (also called Battery Wagner) was a fortification on Morris Island, South Carolina, that covered the southern approach to Charleston harbor. It was the site of two American Civil War battles in the campaign known as Operations Against the Defenses of Charleston in 1863.
Named for deceased Lt. Col. Thomas M. Wagner, Fort Wagner measured 250 by 100 yards (91 m), and spanned an area between the Atlantic on the east and an impassable swamp on the west. Its walls, composed of sand and earth, rose 30 feet (9.1 m) above the level beach and were supported by palmetto logs and sandbags. The fort's arsenal included fourteen cannons, the largest a 10-inch (250 mm) Columbiad that fired a 128-pound shell. A large structure capable of sheltering nearly 1,000 of the fort's 1,700-man garrison provided substantial protection against naval shelling. The fort's land face was protected by a water-filled ditch, 10 feet (3.0 m) wide and 5 feet (1.5 m) deep, surrounded by buried land mines and sharpened palmetto stakes.