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[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], October 3, 1862. (Colorised black and white print). [President Abraham Lincoln, Major General John A. McClernand (right), and E. J...., October 3, 1862. Creator: Alexander Gardner. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)