Statistics for occurrence #1 of “Mississippi river” in chapter 12, page 122 of Col. John C. Moore, Confederate Military History, a library of Confederate States Military History: Volume 9.2, Missouri:

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Vicksburg was the focal point of the war in the west. It commanded the navigation and commerce of the Mississippi river , and as long as it was held by the Confederates kept a practical line of communication open between the Trans-Mississippi department and the government at Richmond, and the armies in Virginia and the...
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