1865
Alexander Gardner, 1859
Alexander Gardner, 1862
Alexander Gardner, 1864
Alexander Gardner, 1865
Alexander Gardner, 1861
![[Headquarters of U.S. Sanitary Commission, Richmond, Virginia]](https://images.metmuseum.org/CRDImages/ph/original/DP70612.jpg)
![[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]](https://images.metmuseum.org/CRDImages/ph/original/DP285633.jpg)
