Kathy,

Have you tried Dr Ken Jones excellent web site? He is the Librarian at Tarleton State University in Stephenville , Texas. His site has all kinds of information on Texas and Alabama CSA units plus other states.I looked up the 15th Texas Infantry Regiment and it has a nice online history.
Try this site:
www.tarleton.edu/~kjones/

Try this above site. It also has great links. If you already know about it , sorry to bore you.
Regards, Craig