[President Abraham Lincoln, Major General John A. McClernand (right), and E. J. Allen (Allan Pinkerton, left), Chief of the Secret Service of the United States, at Secret Service Department, Headquarters Army of the Potomac, near Antietam, Maryland]

October 4, 1862

Albumen silver print from glass negative

22.4 × 18 cm (8.8 × 7.1 in)

SEE IT IN PERSON

In the collection of The Metropolitan Museum of Art, New York — check current display status with the museum.

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