Statistics for occurrence #1 of “General G. K. Warren” in chapter 9, page 207 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 4: The Cavalry:

... General G. K. Warren
The couriers doing duty before this farmhouse, headquarters of General G. K. Warren, are kept riding day and night at break...
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