Statistics for occurrence #1 of “Clarksville, Tennessee” in chapter 10.34 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

... home, so now it had become the common recruiting-ground of Northern and Southern armies on which neither was to establish a camp. The Kentucky secessionists had opened a recruiting rendezvous near Clarksville, Tennessee , a few miles from the Kentucky border, which they called Camp Boone, and recruits began to gather there early in July. Buckner resigned from the State Guard a few days after the battle--of Bull Run...
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