The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.
Francis Trevelyan Miller, Ed.

Fort Moultrie.

This huge gun in Fort Moultrie was designed to throw 600-pound shells. With such defenders Charleston became the best-fortified city on the Confederate sea-coast, and proved a stumbling-block to both the Federal army and navy. Fort Moultrie was on Sullivan's Island, guarding the righthand entrance to the harbor. Charleston was finally evacuated February 17, 1865, after Sherman's march to the sea.

One of the most powerful guns of the Confederacy, in Fort Moultrie

Fort Wagner and Fort Gregg.

These two forts were captured successively in the slow approach by parallels along Morris Island, preceding the evacuation of Charleston. Both Wagner and Gregg were evacuated September 6, 1863. General Beauregard, the Confederate commander, states that Wagner was an inconsiderable work. General Gillmore, whose forces occupied the place, insists that it was an exceedingly strong fort. Its bomb-proofs would hold 1,500 or 1,600 men, and eighteen pieces of heavy ordnance were captured when it finally fell.

Fort Wagner.

Fort Gregg