View of the Winter Camp of the 2nd Regiment of Cavalry, Massachusetts Volunteers on Ayr Hill in Vienna, Virginia, During the American Civil War (1863-1864)

View of the winter camp of the 2nd Regiment of Cavalry, Massachusetts Volunteers on Ayr Hill in Vienna, Virginia, during the American Civil War, c. 1863-1864. From the book Field, Camp, Hospital and Prison in the Civil War, 1863-1865 by Charles A. Humphreys published in 1918.

Source: California Digital Library.

Portrait of Union Soldiers of the 1st Massachusetts Volunteer Cavalry Regiment Posing in Front of Tents in a Camp During the Siege of Petersburg in Virginia (1864)

Portrait of Union soldiers of the 1st Massachusetts Volunteer Cavalry Regiment posing in front of tents in a camp during the Siege of Petersburg in Virginia, August 1864. By Timothy O’Sullivan.

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Hand-Colored Tintype Portrait of Two Unidentified Union Cavalrymen Drinking During the Civil War (1860's)

Hand-colored tintype portrait of two unidentified Union cavalrymen drinking during the Civil War.

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Portrait of Union Officers of the 15th Pennsylvania Volunteer Cavalry Regiment Posing in an Unidentified Camp During the Civil War

Portrait of Union officers of the 15th Pennsylvania Volunteer Cavalry Regiment posing in an unidentified camp during the Civil War.

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President Abraham Lincoln Posing With Union Soldiers of the 5th New York Cavalry Regiment at a Union Camp in Virginia (1862)

President Abraham Lincoln posing with Union soldiers of the 5th New York Cavalry Regiment at a Union camp in Virginia, c. 1862. By O. Pierre Havens. Image from Lincoln in Photographs: An Album of Every Known Pose.

Union Soldiers of the 2nd Regiment Wisconsin Volunteer Cavalry at Benton Barracks in St. Louis, Missouri, During the Civil War

Union soldiers of the 2nd Regiment Wisconsin Volunteer Cavalry at Benton Barracks in St. Louis, Missouri, during the Civil War.

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Union Soldiers of the 9th Regiment Missouri State Militia Cavalry and Civilians Posing in a Street in St. Joseph, Missouri (1862)

Union soldiers of the 9th Regiment Missouri State Militia Cavalry and civilians posing in a street in St. Joseph, Missouri, 1862.

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Portrait of a Group of Union Cavalrymen in West Virginia During the Civil War (1862)

Portrait of a group of Union cavalrymen in Virginia (now West Virginia) during the Civil War, c. 1862.

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Union Officers of the 3rd and 4th Pennsylvania Cavalry Regiments Drinking in Camp at Westover Landing, Virginia (1862)

Union officers of the 3rd and 4th Pennsylvania Cavalry Regiments drinking in camp at Westover Landing, Virginia, August 1862. By Alexander Gardner.

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Union Soldiers Posing at General Adelbert Ames Headquarters During the Civil War

View of Union soldiers posing at General Adelbert Ames headquarters during the Civil War.

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Union Soldiers and Civilians Posing on Sycamore Street in Petersburg, Virginia (1865)

Union soldiers and civilians posing on Sycamore Street in Petersburg, Virginia, April 1865. Animated stereoscopic photographs.

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View of a Parade on Green Street in Memory of President Abraham Lincoln After His Assassination, San Francisco (1865)

View of a parade on Green Street in memory of President Abraham Lincoln after his assassination, San Francisco, 1865.

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Union Cavalrymen of the 6th Pennsylvania Cavalry Regiment Posing With Their Lances in Falmouth, Virginia (1863)

Union cavalrymen of the 6th Pennsylvania Cavalry Regiment posing with their lances in Falmouth, Virginia, June 1863.

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