Antietam, Maryland Allan Pinkerton ("E. J. Allen") of the Secret Service on horseback

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Antietam, Maryland Allan Pinkerton ("E. J. Allen") of the Secret Service on horseback. LOC Summary: Photograph from the main eastern theater of the war, Battle of Antietam, September-October 1862. Date Created/Published: 1862 September. The war pictures provided by LOC. Original medium: 1 negative : glass, wet collodion.