It is one of a series of photographs of the same men. Men of the Co. I, Palmetto Battery, South Charleston Light Artillery at Fort Pemberton on the Stono River. Sources "Valentine Museum, Richmond, VA" and "U.S. Army Military History Institute, Carlisle Barracks, Pennsylvania (USAMHI). The Image of War 1861-1865, Volume Four, Fighting For Time. Siege of Charleston. Page 211 or page 525 on the condensed book.