Statistics for occurrence #1 of “eastern Virginia” in chapter 24 of Philip Henry Sheridan, Personal Memoirs of P. H. Sheridan, General, United States Army .:

...s, Chester, Thornton's Swift Run, Brown's and Rock-fish gaps, tending to an ultimate centre at Richmond. These gaps are low and easy, offering little obstruction to the march of an army coming from eastern Virginia , and thus the Union troops operating west of the Blue Ridge were always subjected to the perils of a flank attack; for the Confederates could readily be brought by rail to Gordonsville and Charlottes...
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