Military Railroad Bridge over Potomac Creek, 1864

This bridge was destroyed and rebuilt several times. In May 1862 General Irwin McDowell employed hundreds of contraband laborers, who replaced the bridge in nine days. Here, in May 1864, the U.S. Military Railroads, again with large numbers of black freedmen, constructed the bridge in forty hours. Photographs such as this one indicated the complexity, cost, and scale of the bridges across many of the South’s rivers and also conveyed the precarious, and sublime, ways the railroad was thought to defy nature.