One monument at Gettysburg honors two units that were not even at the battle – but without whom the other units would have had a harder time getting there. The scene shows the twin pontoon bridges across the Potomac built by the 15th and 50th New York Engineers (map), the only volunteer engineer units in the Army of the Potomac. The bridges allowed the Union army to quickly cross its namesake river to catch up with Lee’s invading troops.

Bronze bas-relief from the 1st New York Engineers monument at Gettysburg

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