Statistics for occurrence #1 of “Colonel Henderson” in chapter 2.6 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...ereas those of the Federals, as in the case of Grant's advance by way of the Wilderness, were often in danger. It was not until Sherman made his great march to the sea across Georgia, a march which Colonel Henderson , the noted English writer on strategy, says would have been impossible had not a Federal fleet been ready to receive him when he reached the Atlantic, that the South felt its communications hopeless...
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