Pontoon bridge at Bull Run, Va., 1862.

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Federal engineers bridging the Tennessee River at Chattanooga, March 1864.

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Digging the Dutch Gap Canal on the James River, Va., 1864.

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The four-tiered, 780-foot-long railroad trestle bridge built by Federal engineers at Whiteside, Tenn., 1864. A guard camp is also shown. Photographed by George N. Barnard.

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Pontoon bridge across the James River at Richmond, Va., 1865.

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