I don't have any additional insight about this Dr. Marable. But, here is some added data
on John Crowell
Co. G 12 Tenn. Cav. U.S.A.
Pvt. John S. Crowel age 25
Pvt. James F. Crowel age 23
Pvt. Standey Crowel age 18
citizens of Humphreys Co.,Tenn.
Mustered in at Charlotte,Tenn 2/15/64
All three "Deserted on 25 Feb.1864 from
Charlotte"

Later in the war men from the 12th who had deserted sometimes were found among
guerrillas "of the worst type".

The 12th was encamped at Camp Gilliam at
Dickson county,until May 27,1864.

The two Dotson's who gave their testimony at Clarksville, who sons of George C. Dotson of later Gilliam's Station, their father had food supplies taken by soldiers off to this
camp.

John D. Kotila