Battle at Lost Mesa — Terrell L. Bowers

It didn't sound dangerous: Lou Ryderson's mission was to get proof that an Indian agent was cheating the Indians out of their government-issue supplies at the Wind River Reservation. But Lou runs into trouble when Running Elk's bride-to-be, Kim, is kidnapped. Soon the Indian warrior is on the warpath. Lou, the gun-happy kidnappers and a rescue party all converge, and it positively rains bullets. Lou and Kim will be as lucky as hell to escape with their lives...