Statistics for occurrence #1 of “Northern Mississippi” in chapter 16 of Admiral David D. Porter, The Naval History of the Civil War.:

... it was wedged in between five secession States: and the Confederates, while they held it, could keep the Federal troops from advancing South. Should the latter obtain possession they would control Northern Mississippi , Alabama and Georgia, with parts of North Carolina and Virginia. With the Cumberland and the Tennessee Rivers, and all the railroads in the Union possession, the rebellion would have been confi...
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