Statistics for occurrence #1 of “Ohio River” in chapter 5.35 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...hift of base for ulterior and highly important purposes. Many an orator in his safe office at the North had proclaimed his purpose to cleave his way to the sea. Every expedition which crossed the Ohio River in the early part of the war headed for the sea; but things were not ripe till the Western army had fought, and toiled, and labored down to Atlanta. Not till then did a March to the sea beco...
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