Union Soldiers Posing in Front of and on a Pontoon Bridge Across the James River at Deep Bottom, Virginia, During the Siege of Petersburg

Union soldiers posing in front of and on a pontoon bridge across the James River at Deep Bottom, Virginia, during the Siege of Petersburg. Attributed to Mathew Brady.

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View of Union Troops Building a Pontoon Bridge Over the Port Royal Sound in Beaufort, South Carolina (1862)

View of Union troops building a pontoon bridge over the Port Royal Sound in Beaufort, South Carolina, March 1862. By Timothy O'Sullivan. Animated stereoview.

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Photograph Taken During the Second Battle of Fredericksburg Showing Battle Smoke Drifting Through Downtown Fredericksburg, Virginia (1863)

Photograph taken during the Second Battle of Fredericksburg showing battle smoke drifting through downtown Fredericksburg, Virginia, May 3, 1863. A number of Union soldiers are standing/possibly moving on the pontoon bridge crossing the Rappahannock River in the middle ground. By Andrew J. Russell.

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View of Union Soldiers Guarding a Pontoon Bridge Crossing the Potomac River Connecting Virginia With Brunswick, Maryland (1862)

View of Union soldiers guarding a pontoon bridge crossing the Potomac River connecting Virginia, in the foreground, with Berlin (now Brunswick), Maryland, October 1862. The bridge on the right was destroyed by Confederate forces. By Alexander Gardner. Animated stereoscopic photographs.

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View of a Pontoon Bridge Built by the 50th New York Engineer Regiment Over the Pamunkey River at Nelson's Crossing, Virginia (1864)

View of a pontoon bridge built by the 50th New York Engineer Regiment over the Pamunkey River at Nelson's Crossing, Virginia, May 1864. The head of an unidentified man is visible in the foreground. By Timothy O'Sullivan. Animated stereoscopic photographs.

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View of Egbert Guy Fowx or an Assistant Developing a Photograph in a Mobile Darkroom in Richmond, Virginia (1865)

View of Egbert Guy Fowx or an assistant developing a photograph in a mobile darkroom with a pontoon bridge and downtown Richmond in the background in Richmond, Virginia, c. 1865.

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French Soldiers Crossing the Marne River on a Pontoon Bridge

French soldiers marching across the Marne River on a pontoon bridge, c. 1914. Animated stereoview.