Statistics for occurrence #1 of “Mississippi river” in chapter 6, page 123 of Adam Badeau, Military history of Ulysses S. Grant from April 1861 to April 1865. Volume 1:

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Military importance of the Mississippi river Grant proposes movement into interior, against Vicksburg campaign begun McClernand endeavors to obtain command of an expedition against Vicksburg Grant moves to Holly Springs enemy retreats reb...
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