From the back of the book:
A Soldier of Fortune trapped in an alien world!
You are Paul Nelson. Once a CIA mercenary, you took your orders from Rick Galloway. Then an operation went bad. Outnumbered. Outgunned. You faced certain death, until the alien spaceship appeared. But it wasn't a rescue.
Dropped on the distant planet Tran, you and the men of your outfit were told to enslave a medieval culture. Using advanced weaponry and military skills, your unit accomplished its mission...then you decided to strike out on your own.
Now, with limited firepower and not much ammo, survival is a game you play every day - but can only lose once.
Combat Command book #7