Statistics for occurrence #1 of “Mississippi river” in chapter 19 of Adam Badeau, Military history of Ulysses S. Grant from April 1861 to April 1865. Volume 1:

...m invested, by order of the Secretary of War, indorsed by the President, and by order of the President communicated to you by the General-in-chief, with the command of all the forces operating on the Mississippi river , I claim that all orders affecting the condition or operation of those forces should pass through these headquarters. Otherwise I must lose a knowledge of current business, and dangerous confusion ...
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