Allan Pinkerton, Abraham Lincoln, and John A. McClernand
President Abraham Lincoln (C), flanked by Major Allan Pinkerton (L) of the Pinkerton National Detective Agency and General John A. McClernand (R), visits the Union camp at Sharpsburg, Maryland in October 1862, a few weeks after the Battle of Antietam. Lincoln visited the camp in an attempt to persuade General George McClellan to take his army on the attack. | Location: Near Sharpsburg, Maryland, USA.
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