Detective Allan Pinkerton ("E. J. Allen") of the Secret Service on horseback in Antietam, Maryland in 1862
CREDIT: Gardner, Alexander, photographer. Antietam, Md. Allan Pinkerton ("E. J. Allen") of the Secret Service on horseback, 1862. Prints and Photographs Division, Library of Congress. Reproduction Number LC-DIG-cwpb-03855 DLC.
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