French troops crossing the Marne by pontoon bridge

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First pontoon bridge built across the Marne by U.S. Engineers, Lucy, France

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First pontoon bridge built across the Marne by U.S. Engineers, Lucy, France

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[Mrs. Nelson's Crossing, Va. Pontoon bridge across the Pamunkey, built by the 50th New York Engineers]

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[Mrs. Nelson's Crossing, Va. Pontoon bridge across the Pamunkey, built by the 50th New York Engineers]

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Wagon train crossing pontoon bridge, Rappahannock River, below Fredericksburg, Va.

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Wagon train crossing pontoon bridge, Rappahannock River, below Fredericksburg, Va.

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Occupation of Fredericksburg. General McDowell's corps crossing the Rappahannock River on pontoon bridge...

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Porto Rico--Pontoon bridge, Guanica harbor where U.S. troops first landed

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