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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Union Soldiers of the Independent Battery B, Pennsylvania Light Artillery Posing With Their Guns on the Antietam Battlefield Shortly After the Battle There Near Sharpsburg, Maryland (1862)

Union soldiers of the Independent Battery B, Pennsylvania Light Artillery posing with their guns on the Antietam battlefield shortly after the battle there near Sharpsburg Maryland, September 20, 1862. By Alexander Gardner. Animated stereoscopic photographs.

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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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Union General John C. Caldwell and his Staff Posing on the Antietam Battlefield (1862)

Union General John C. Caldwell and his staff 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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Dead Confederate Soldiers in the Bloody Lane With Union Soldiers Posing Behind Them After the Battle of Antietam (1862)

Dead Confederate soldiers in the Bloody Lane with Union soldiers, probably part of a burial detail, posing behind them after the Battle of Antietam, 1862. By Alexander Gardner. Animated stereoscopic photographs.

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Three Union Soldiers Posing on Top of a Signal Tower on Elk Mountain, Maryland (1862)

Three Union soldiers posing on top of a signal tower on Elk Mountain, Maryland, September 1862. By Timothy O'Sullivan. Animated stereoscopic photographs.

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Wounded Confederate in a Field Hospital After the Battle of Antietam

Wounded Confederate soldiers being treated at a makeshift field hospital by Union soldiers of the  14th Indiana Volunteer Infantry Regiment after the Battle of Antietam in Keedysville, Maryland, 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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Confederate Dead at Miller Farm Shortly Before Burial

Union soldiers posing with dead Confederate troops who died during the Battle of Antietam at the Miller Farm, 1862. By Alexander Gardner. Animated stereoscopic photograph.

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