平克頓於1862年在馬里蘭州安提耶坦 (Antietam) 地區執行任務時的馬上英姿

出處: Gardner, Alexander, photographer. "Antietam, Maryland. Allan Pinkerton ("E. J. Allen") of the Secret Service on Horseback." September 1862. Selected Civil War Photographs, 1861-1865. American Memory collections, Library of Congress.