Statistics for occurrence #1 of “Rapidan River” in chapter 10 of George H. Gordon, From Brook Farm to Cedar Mountain:

...from Madison Court House to Sperryville crosses Robertson's River. General Bayard, with four regiments of cavalry, was near Rapidan Station, the point where the Orange and Alexandria Railroad crosses Rapidan River , with his pickets extended east to Raccoon Ford, and connecting with Buford at Barnett's Ford. The Rapidan was lined with cavalry pickets from Raccoon Ford to the forks of the Rappahannock above Fa...
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