"The Comanches: A History of White's Battalion, Virginia Cavalry," by Frank M. Myers. Originally published in 1871 at Baltimore, Maryland, it was reprinted in 1956 at Marietta, Georgia, by the Continental Book Company. 1st edition and 2nd edition may both prove hard to locate
You may find copies of this book at abebooks.com here:
http://www.abebooks.com/servlet/SearchResults?sts=t&tn=The+Comanches%3A+A+History+