Ancestry.com. Confederate Service Records, 1861-1865 [database on-line]. Provo, UT, USA: The Generations Network, Inc., 2007. Original data: Compiled Service Records of the Confederate Soldiers Who Served in Organizations Raised Directly by the Confederate Government; (National Archives Microfilm Publication M258, 123 rolls); War Department Collection of Confederate Records, Record Group 109; National Archives, Washington, D.C.
Art Green, a contributing author of history-sites.com, also has a book available on the 15th. Confederate Cavalry.
http://history-sites.com/books.htm#green4