SciFi: Two powers are fighting a war on an empty planet by continuously teleporting their robotic troops there. Spoilers ahead.

[Dima]

The main character arrives to this planet (maybe due to some accident, not sure about this) and discovers it is inhabited by several primitive tribes, each possessing a knowledge of a single 'advanced' technology ( One tribe has a knowledge of electricity, another knows of fuels and oil refining, etc.).

[Lobstergirl, au gratin]

When was it published? Or when did you read it?
Cover?
Author's gender?
Series?