A Group of Union Officers, Scouts, and Agents Posing in Front of a Tent on the Antietam Battlefield Near Sharpsburg, Maryland (1862)

A group of Union officers, scouts, and agents including head of Union intelligence operations, Allan Pinkerton, posing in front of a tent on the Antietam battlefield near Sharpsburg, Maryland, October 1862.

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A Group of Union Artillery Officers Posing in Front of a Tent on the Antietam Battlefield (1862)

A group of unidentified Union artillery officers posing in front of a tent on the Antietam battlefield shortly after the battle there near Sharpsburg, Maryland, September 1862. By Alexander Gardner. Animated stereoscopic photographs.

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Union Officers Colonel John S. Crocker, Lieutenant Colonel Benjamin C. Butler, and Another Unidentified Man of the 93rd New York Volunteer Infantry Regiment Posing in Front of a Tent on the Antietam Battlefield (1862)

Union officers Colonel John S. Crocker, Lieutenant Colonel Benjamin C. Butler, and another unidentified man of the 93rd New York Volunteer Infantry Regiment posing in front of a tent on the Antietam battlefield shortly after the battle there, September 1862. By Alexander Gardner. Animated stereoscopic photographs.

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Portrait of Allan Pinkerton and Four Other Unidentified Men Posing in Front of a Tent on the Antietam Battlefield (1862)

Portrait of Union intelligence chief Allan Pinkerton (sitting on left) and four other unidentified men posing in front of a tent on the Antietam battlefield shortly after the battle there near Sharpsburg, Maryland, September 1862. By Alexander Gardner. Animated stereoscopic photographs.

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President Abraham Lincoln Meeting With General George B. McClellan in the General's Tent on the Antietam Battlefield (1862)

President Abraham Lincoln meeting with Union General George McClellan in the general's tent on the Antietam battlefield near Sharpsburg, Maryland, October 3, 1862. By Alexander Gardner. Animated stereoscopic photograph.

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