Statistics for occurrence #1 of “northern Mississippi” in chapter 6, page 144 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:

...rectly with Bragg during the battle. On December 17th Forrest, with three thousand men, was sent into western Tennessee to destroy the railroads in the rear of Grant's army in western Tennessee and northern Mississippi . Morgan with two brigades, Duke's and Breckinridge's, thirty-nine hundred in all, with two light batteries of seven pieces, left Alexandria, Tennessee, December 22, 1862, his object being to destro...
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