Statistics for occurrence #1 of “Washington, D. C.” in chapter 21 of Adam Badeau, Military history of Ulysses S. Grant from April 1861 to April 1865. Volume 1:

... effect this, they will at least occupy a portion of the enemy's forces, and prevent them from reenforcing Vicksburg. I hope, however, that they will do still better, and be able to join you. Washington, D. C. , January 25, 2.40 P. M. Forts Henry and Donelson have been transferred to the Department of the Cumberland. Memphis, Tenn., January 25, 1863. I leave for the fleet at Vicksburg to-morro...
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