President Lincoln visiting the battlefield at Antietam, Md., October 3, 1862. General McClellan and 15 members of his staff are in the group. Photographed by Alexander Gardner. 165-SB-23 A New York Herald Tribune wagon and reporters in the field Constructing telegraph lines, April 1864. Photographed by Timothy H. O'Sullivan. Black laborers on a wharf, James River, Va A refugee..