Statistics for occurrence #1 of “Mississippi river” in part 8.19, chapter 8.21 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...freed and protected from the secession forces within and around it. In pursuance of this plan The Western Department was created, comprehending, with Illinois, the states and territories west of the Mississippi river to the Rocky Mountains, including New Mexico. For reasons not wholly military, the President reserved the State of Kentucky, but assured me that so soon as I had succeeded in raising and organizing...
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