Statistics for occurrence #1 of “Col. Maxcy Gregg” in article pos=61 of The Daily Dispatch: June 19, 1861., [Electronic resource]:
... Warrenton Rifles and five Cavalry Companies, viz.; Ball's, Chesterfield corps; Wickham's, (Hanover,) Prince William, Rappahannock and Black Horse Cavalry, of Fauquier.
It was thought probable that Col. Maxcy Gregg 's South Carolinians would take the place of the Richmond companies, and permit them to rejoin their Regiment at Manassas Junction.
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