The Engineers at Vicksburg, Part 18: Bridging the Big Black River
One of the pontoon bridges Gen. Ulysses Grant ordered built across the Big Black River immediately after Maj. Samuel Lockett, the Confederate chief engineer, burned the railroad bridge to allow the a retreat to Vicksburg without Union pursuit.

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Photo by: Library of Congress |  VIRIN: 170309-A-YL201-0001.JPG