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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,
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Antietam, Md. President Lincoln and Gen. George B. McClellan in the general's tent, September-October 1862. : r/ColorizedHistory
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President Lincoln in General McClellan's tent after the Battle of Antietam, 1862. Artist: Unknown Stock Photo - Alamy
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