Statistics for occurrence #1 of “General Grant” in chapter 13, page 262 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.:

...orkings, it was at a somewhat lower level. However, the Confederate works were incomplete when, on July 30, 1864, the Federal mine was exploded. The most lasting effect of this demonstration by General Grant was to produce a feeling of impending danger at every salient point of the Confederate line of defense; and General Lee ordered eight more companies of engineer troops from north of the James to Pete...
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