Statistics for occurrence #1 of “General Benham” in chapter 12 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...vania. The work shown in this photograph was but child's play compared with the undertaking just one month later, when Grant finally decided to cross the James. One hour before noon on June 15th, General Benham received orders to prepare a pontoon-bridge across the James River for the passage of the entire army. In anticipation of this order, pontoons had been sent from Fort Monroe, and the work was start...
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