First, let me state my bias on the subject: My ggg-gf was a member of the 13th Tennessee (US) Calvary, Co. G. Things got so bad at home in Carter County, TN that he joined the unit as a 41 year old man in bad health.
I suggest that anyone looking for more information on this topic read War at Every Door: Partisan Politics and Guerrilla Violence in East Tennessee, 1860-1869 by Noel C. Fisher