Montaine's Revenge by Graham Dale
Two days before the end of the Civil War, Sergeant Cody Montaine is gunned down and left for dead by a bunch of deserters led by Butte Fresno. Even though he survives the vicious attack, Cody has lost his memory and, taking the name of Lucky Johnson, sets out to piece his life back together. Periodic recollections eventually lead Cody to the New Mexico town of Las Vegas where Fresno has assumed his identity using a stolen deed of inheritance. But will Cody get revenge and so exhume his old life? Turning the tables on the evil brigand is fraught with danger. Only with guile and the help of a beautiful woman will justice be served.