According to the "Nashville Dispatch" (July 23,1863) they were captured while foraging in Dickson County with Lieutenant James M. Dotson along with an ex-Confederate soldier named W.H. Hunt.
Link to article "News and Rumors at Clarksville."
http://www.artcirclelibrary.info/Reference/civilwar/1863-07.pdf
I know that Lieut. Dotson was sent to Johnson's island and died of fever and is buried in the P.O.W. cemetery.
Best Regards!
John