平克頓向林肯總統提出暗殺的警告，旁邊站立的是約翰馬剋剋拉南少將 (Major General John A. McClernand)

出處: Gardner, Alexander, photographer. "Allan Pinkerton, President Lincoln, and Major. General John A. McClernand, Antietam, Maryland (another view)." October 3, 1862. Selected Civil War Photographs, 1861-1865, American Memory collections, Library of Congress.