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[President Abraham Lincoln, Major General John A. McClernand (right), and E. J...., October 4, 1862. Creator: Alexander Gardner. [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 4, 1862. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)