Antietam, Maryland Allan Pinkerton ("E. J. Allen") of the Secret Service on horseback.

Antietam, Maryland Seated: R. William Moore and Allan Pinkerton. Standing: George H. Bangs, John C. Babcock, and Augustus K. Littlefield.

Antietam, Maryland Blacksmith shoeing horses at headquarters, Army of the Potomac. LOC Summary: Photograph from the main eastern theater of the war, Battle of Antietam, September-October 1862.

Antietam, Maryland Colonel John S. Crocker, Lieutenant Colonel Benjamin C. Butler, and adjutant of 93d New York Volunteers.

Antietam, Maryland President Lincoln and General George B. McClellan in the general's tent.

Keedysville, Maryland, vicinity. Smith's barn, used as a hospital after the battle of Antietam.

Sharpsburg, Maryland Principal street. LOC Summary: Photograph from the main eastern theater of the war, Battle of Antietam, September-October 1862. Date Created/Published: 1862 September.

Sharpsburg, Maryland View with Episcopal church in distance. LOC Summary: Photograph from the main eastern theater of the war, Battle of Antietam, September-October 1862.

Sharpsburg, Maryland Lutheran church. LOC Summary: Photograph from the main eastern theater of the war, Battle of Antietam, September-October 1862. Date Created/Published: 1862 September.

Keedysville, Maryland, vicinity. Confederate wounded at Smith's Barn, with Dr. Anson Hurd, 14th Indiana Volunteers, in attendance.