Statistics for occurrence #1 of “Mississippi river” in chapter 1.24 of Southern Historical Society Papers, Volume 32.:

... With Pittsburg landing as a base, the army was to occupy north Mississippi and Alabama, command the entire railroad system of that section, and take Memphis in the rear while Halleck came down the Mississippi river . General Johnston suspected the movement and prepared to defeat it. General Grant's army in camp consisted of 58,000 men, 50,000 of whom were effective, and Buell was near at hand with 37,000 more. ...
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