About May 1, 1864, part of Vaughn’s Brigade, under General Vaughn, were dismounted and reported to Brigadier General W. E. Jones at Staunton, Virginia, and with him fought at Piedmont on June. The brigade then joined General Jubal Early for his campaign in the Valley of Virginia in the summer and fall of 1864 and the raid on Washington, participating in all the battles and skirmishes of this campaign. The brigade was remounted at Winchester, Virginia, and served as cavalry during the remainder of this campaign. The brigade returned to East Tennessee about October 1, 1864

Battle of Piedmont Order of battle
https://en.wikipedia.org/wiki/Piedmont_Confederate_order_of_battle

The Battle of Piedmont was fought June 5, 1864, in the village of Piedmont, Augusta County, Virginia.

Confederate States Army of the Valley District
Department of Southwest Virginia and East Tennessee

BG William E. (Grumble) Jones

Vaughn's Brigade
BG John C. Vaughn

16th Georgia Cavalry Battalion:
1st Tennessee Cavalry: Col James Carter
12th Tennessee Cavalry Battalion: Maj George W. Day
16th Tennessee Cavalry Battalion:
3rd Tennessee Mounted Infantry (detachment):
39th Tennessee Mounted Infantry (detachment): Maj Robert McFarland
43rd Tennessee Mounted Infantry: Ltc David M. Key
59th Tennessee Mounted Infantry: Col William L. Eakin
60th, 61st & 62nd Tennessee Mounted Infantry (fragments)

The brigade retained this composition up through Early’s raid on Washington at Monocacy July 9, 1864