Statistics for occurrence #1 of “Ohio River” in chapter 2.8, page 120 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...e, Ohio sent an army into West Virginia; Pennsylvania, into the Shenandoah valley; the national Government concentrated troops for the protection of its capital; the Western States gathered along the Ohio River and in Missouri. This great dispersion existed on both sides and continued more or less till the end of the war. The advantage it gave was in the protection of the friendly portion of the populatio...
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