Statistics for occurrence #1 of “North Anna River” 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.:

...d with tent canvas. To the left is the park of the train. The pontoon-boats are ready on their wagons. All the bridge material awaits transportation. Lee's army, in retiring across the North Anna River before Grant's army in May, 1864, destroyed the permanent bridge at this point. By the summer of 1864 half an hour sufficed for the experienced engineers to lay a bridge like this, after the arriva...
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