Check out Jason Sheehan's A Private Little War, out on June 11 from 47North:
Private “security” firm Flyboy, Inc., landed on the alien planet of Iaxo with a mission: In one year, they must quash an insurrection; exploit the ancient enmities of an indigenous, tribal society; and kill the hell out of one group of natives to facilitate negotiations with the surviving group—all over 110 million acres of mixed terrain.
At first, the double-hush, back-burner project seemed to be going well. With all the advantages they had going for them—a ten-century technological lead on the locals, the logistical support of a shadowy and powerful private military company, and aid from similar outfits already on the ground—a quick combat victory seemed reasonable. An easy-in, easy-out mission that would make them very, very rich.
But the ancient tribal natives of Iaxo refuse to roll over and give up their planet. What was once a strategic coup has become a quagmire of cost over-runs and blown deadlines, leaving the pilots of Flyboy, Inc., on an embattled distant planet, waiting for support and a ride home that may never come….