Here’s one from Carlisle Barracks which looks interesting:

10th Confederate Volunteer Cavalry Regiment

Griffith, Lucille, editor. “Yours Till Death: Civil War Letters of John W. Cotton. University, AL: U AL, 1951, 128 p. E605.C83 [U.S. Army Military History Institute]

http://cdm16635.contentdm.oclc.org/cdm/singleitem/collection/p16635coll9/id/9955/rec/2

………..

John W. Cotton
Enlisted as a Private
"C" Co. CS 10th Cavalry

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records
(c) Historical Data Systems, Inc. @ www.civilwardata.com