Statistics for occurrence #1 of “Ohio River” in chapter 39 of Admiral David D. Porter, The Naval History of the Civil War.:

...s amounting, in the aggregate, to about 5,500 men. Kentucky, Tennessee and Arkansas, the upper portions of Mississippi and Louisiana, and the southern portions of those States which border on the Ohio River on the north, have been relieved and liberated through the instrumentality of the gun-boats, acting by themselves or in earnest and cordial co-operation with the armies. Rear-Admiral Porter has w...
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