Brigadier general (1829-1872) in the Union Army during the Civil War, who served as Provost Marshal of the Army of the Potomac under George B. McClellan during the 1862 Peninsula Campaign. Uncommon 2.5 x 4 carte-de-visite photo of Porter in uniform by Mathew Brady, signed on the mount in ink, "A. Porter, Brig. Genl. U.S.A." In very good to fine condition, with a trimmed left edge, and staining to the image.
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