1863
Alexander Gardner, 1865
Alexander Gardner, 1862
Alexander Gardner, 1861
Alexander Gardner, 1864
Alexander Gardner, 1863
![[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/DP254903.jpg)
![Col. Greene 2.D[ivision]](https://media.getty.edu/iiif/image/b8faa8a2-0baa-4424-80a9-31e6790b7d57/full/843,/0/default.jpg)
