Statistics for occurrence #1 of “Northwestern Virginia” in chapter 4 of Col. Robert White, Confederate Military History, a library of Confederate States Military History: Volume 2.2, West Virginia:

...h and Romney. On August 3, 1861, Rosecrans had assigned General Kelley to the special military district of Grafton, embracing the Baltimore & Ohio railroad from Grafton to Cumberland, and the Northwestern Virginia from Grafton. Under his command nearly 4,000 men were stationed at Grafton and along the railroad. In September, Col. Angus W. McDonald, a leader in the Confederate cause in the lower Shenandoah ...
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