Statistics for occurrence #1 of “Loudoun counties” in chapter 9.72 of Southern Historical Society Papers, Volume 7.:

... on the Rappahannock to watch the enemy in front and move the main body parallel to the Blue Ridge and on Longstreet's right flank, who was to move near the base of the mountains through Fauquier and Loudoun counties . The position of the enemy, as far as known, was as follows: His cavalry massed in Fauquier, principally from Warrenton Springs to Catlett station, with the Twelfth corps, and other infantry supp...
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