Statistics for occurrence #1 of “Mississippi river” in chapter 2 of Adam Badeau, Military history of Ulysses S. Grant from April 1861 to April 1865. Volume 1:

...was divided by the United States authorities, into military departments, whose boundaries and organization were repeatedly changed. The state of Illinois, and the states and territories west of the Mississippi river , and east of the Rocky mountains, constituted at this time the Western Department, of which Major-General Fremont was in command. On the 8th of August, Fremont transferred Grant to Ironton, Missour...
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