Statistics for occurrence #1 of “Rappahannock” in chapter 3.34 of Southern Historical Society Papers, Volume 9.:

...foot cavalry. But the first time I ever heard the sobriquet publicly applied was after the evacuation of Manassas, in March, 1862, while General Ewell was holding with his division the line of the Rappahannock . Our regiment had been on picket at Bealton Station as a support to Stuart's cavalry, and the enemy were rapidly advancing in large force, when another infantry regiment came down on a train of car...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Rappahannock (Virginia, United States) 724 0 34 0 0 user votes
Rappahannock (Virginia, United States) 62 0 6 0 0 user votes

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