Statistics for occurrence #1 of “Cumberland valleys” in chapter 1 of William Swinton, Campaigns of the Army of the Potomac:

...ttysburg—the two actions out of the limits of Virginia—were fought in the narrow salient of a great triangle, having the southern boundary line of Virginia as its base, the Shenandoah and Cumberland valleys as its western side, and the Susquehanna River and Chesapeake Bay as its eastern side. From its apex, this triangle measures seven hundred and fifty miles on its mountainside, and about three hundr...
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