Antietam, Maryland Allan Pinkerton, President Lincoln, and Major General John A. McClernand.

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Antietam, Maryland Allan Pinkerton, President Lincoln, and Major General John A. McClernand. LOC Summary: Photograph from the main eastern theater of the war, Battle of Antietam, September-October 1862. Date Created/Published: 1862 October 3. Pic of the American Civil War provided by LOC. Original medium: 1 negative : glass, wet collodion.