Title: [President Abraham Lincoln, Major General John A. McClernand (right), and E. J. Allen (Allan Pinkerton, left), Chief of the Secret Service of the United States, at Secret Service Department, Headquarters Army of the Potomac, near  Antietam, Maryland]
Object type: Photograph
Date: October 4, 1862
Artist:  Alexander Gardner 
Artist bio: American, Glasgow, Scotland 1821–1882 Washington, D.C.
Artist nationality: American, Scottish
Artist role: Artist
Medium: Albumen silver print from glass negative
Dimensions: Image: 22.4 x 18 cm (8 13/16 x 7 1/16 in.)
Mount: 29.2 x 20.7 cm (11 1/2 x 8 1/8 in.)
Classification: Photographs
Credit line: Gilman Collection, Gift of The Howard Gilman Foundation, 2005
Department: Photographs
Repository: Metropolitan Museum of Art, New York, NY
Tags: term: Tents, term: American Civil War, term: Abraham Lincoln, term: Men, term: Generals