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Antietam, Md. Allan Pinkerton, President Lincoln, and Maj. Gen. John A. McClernand
Antietam, Md. Allan Pinkerton, President Lincoln, and Maj. Gen. John A. McClernand
Credit: Alexander Gardner
Allan Pinkerton, President Abraham Lincoln, and Major General John A. McClernand not long after the Civil War’s first battle on northern soil in Antietam, Maryland on October 3, 1862.