Ballentine's Regiment was consolidated with the 7th. Regiment Miss. Cavalry in February of 1865.
3rd. Corporal E. E. Mortimer of Carroll County appears on a final surrender roll as a member of Company A, 7th. Regiment Miss. Cavalry. He was paroled May 20, 1865 at Grenada, MS.
He is also listed at this site.
http://mscgr.homestead.com/MSCGRMorrison.html