Statistics for occurrence #1 of “Ohio river” in chapter 4 of Col. John M. Harrell, Confederate Military History, a library of Confederate States Military History: Volume 10.2, Arkansas:

...cal effect in preventing the reinforcement of Grant was its chief importance. The eastern boundary of Missouri was occupied by large bodies of the enemy, and other forces could be sent out from the Ohio river on short notice. Kansas, to the west, swarmed with the enemies of the South. Were there available forces of the Confederates sufficient to hold Missouri, should they succeed in occupying it? Y...
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