Bugle and Spur — Brian Garfield

He was the best soldier Fort Dragoon ever had ... and the colonel was out to break him ... Colonel Mallory loved busting young lieutenants like dried sticks. So when he arrived at Fort Dragoon, he gave every lowdown, scum-eating duty in the outfit to Lieutenant Ben Hannibal. The colonel's orders were get Apache chief Togomasai—dead or alive.But Mallory and Hannibal knew they'd be looking down each other's gun barrels long before that!