Incidents of the war, group at Secret Service Department Headquarters, Army of the Potomac, Antietam, October 1862

Photograph shows fourteen men, including Allan and William Pinkerton, and several Union Army officers posed in front of a tent.

Photograph shows fourteen men, including Allan and William Pinkerton, and several Union Army officers posed in front of a tent. Photo probably taken in 1862. Library of Congress.

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