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

...ent favored, and McClernand was promised, if not that he should supersede Grant, at least that he should be allowed to raise troops for an independent expedition, whose object was the opening of the Mississippi river and the capture of Vicksburg. He made his plans, and submitted them to the President, who approved, and directed McClernand to lay them before the general-in-chief. But Halleck was a soldier ...
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