[General Randolph B. Marcy with officers and civilians at Army of the Potomac headquarters. Antietam, Md.]

Photograph shows from left Captain Wright Rives, John W. Garrett, an orderly, General Randolph Marcy, Lt. Col. Andrew B. Porter, Col. Thomas S. Mather, Ozias M. Hatch, Joseph C. G. Kennedy outside a tent at Army of the Potomac headquarters.
Brady's Album Gallery, no. 605.
Entered according to Act of Congress, in the year 1862, by Alexander Gardner, in the Clerk's Office of the District Court of the District of Columbia.
Title from negative.
Caption on mount crossed out with note written above, "wrong caption". Incorrect caption says: Group of President Lincoln, Gen. McClellan, and suite, at headquarters Army of Potomac, previous to reviewing the troops and the battlefield of Antietam, 3d Oct., 1862.
Digitized, 2014. Funding from The Center for Civil War Photography.
Original glass negative may be available: LC-B815-603 (half stereo, right side)

Alexander Gardner (October 17, 1821 - December 10, 1882) was a Scottish photographer who is best known for his photographs of the American Civil War. He emigrated to the United States in 1856 and worked as a photographer in Mathew Brady's studio. Gardner was sent to document the American Civil War and produced some of the most iconic images of the conflict, including photographs of the battlefields at Antietam and Gettysburg. After the war, Gardner photographed President Lincoln and the American West, including images of Native Americans, settlers, and the construction of the transcontinental railroad.