A Goggle Search, "Abbotts Scouts," yields the following re the 60th Tennessee:
http://www.rootsweb.com/~tnhawkin/60tn.htm
I suspect that you may already aware of this piece.
"It was not until November 10, 1864, that the 60th, 61st and 62nd Regiments were reported as regiments in Vaughn’s Brigade. At that time the 60th was commanded by lieutenant Colonel Gregg, and the brigade was made up of the 16th Georgia Cavalry Battalion, 1st (Carter’s), 3rd, 39th, 43rd, 59th, 60th, 61st and 62nd Tennessee Mounted Regiment, 12th (Day’s) and 16th (Neal’s) Cavalry Battalions. The brigade reported 993 effectives, 1358 present, 796 prisoners of war. It was in the Department of Western Virginia and East Tennessee, commanded by major General J. C. Breckinridge. The 60th was reported stationed near Davenault’s Ford.
"This was the last regimental or company report found on the 60th. On February 28, 1865, the order of battle for Brigadier General Echols’ Command showed the 60th, now commanded by Colonel Gregg, still in Vaughn’s Brigade, with Abbott’s Scouts having been added to the brigade, and the 13th Georgia Regiment reported instead of the 16th Georgia Battalion. General Echols was still in command of the Department when news of General Lee’s surrender was received, and he dissolved his command in Western Virginia. Some of General Vaughn’s Brigade crossed into North Carolina and served as part of President Jefferson Davis’ escort from Charlotte, North Carolina to Washington, Georgia, but it is now known whether of not any of the 60th were in this force."
George Martin
Sparks, NV