[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
Department: Photographs
Artist: Alexander Gardner|Abraham Lincoln|John Alexander McClernand|Allan Pinkerton
Artist bio: American, Glasgow, Scotland 1821–1882 Washington, D.C.|American, Hardin County, Kentucky 1809–1865 Washington, D.C.|American, Breckinridge County, Kentucky 1812–1900 Springfield, Illinois|American (born Scotland), Glasgow 1819–1884 Chicago
Artist role: Artist|Person in Photograph|Person in Photograph|Person in Photograph
Artist nationality: American, Scottish|American|American|American, born Scotland
Date: October 4, 1862
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
Accession year: 2005
Tags: American Civil War|Tents|Abraham Lincoln|Men|Generals