Chasing Ghosts — Charles Ray

Ninth Cavalry First Sergeant Ben Carter has been ordered to take his detachment into the mountains of central New Mexico Territory to capture the elusive and vicious Apache, Grey Wolf, known as the Ghost Warrior. Grey Wolf and his band are leaving a trail of death and destruction, and Ben begins to realize that capturing the man will be more difficult than he expected. This is the 12th book in the Buffalo Soldier series.