I have seen a book in a library which might help you.

Bailey, Anne. ed. IN THE SADDLE WITH THE TEXANS: DAY-BY-DAY WITH PARSONS'S TEXAS CAVALRY BRIGADE 1862-1865 (McWhiney Foundation Press:Abilene, Texas) 2004. ISBN 1-693114--48-1

This book appears to be the order book of Parsons' Texas Cavalry.