Statistics for occurrence #1 of “Gaines' Mill” in chapter 10 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.:

... The ammunition train always took precedence on the march. By 1864, the problem of getting ammunition expeditiously to the front had been solved, and there were no more such shortages as at Gaines' Mill . In this photograph, the harbor of Hampton Roads swarms with ammunition schooners, transports, coal barges, and craft of every sort. The decks of the schooners in the foreground are piled high wi...
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