Showdown on Stend IV (2001)

From Introduction:

Stend IV is a colony world with very little in the way of high technology, no planetary defensive shield, only a few isolated settlements, and no military to speak of aside from a rag-tag colonial militia -- making it a perfect target for the Army of Life. The planet has been colonized by the Gran, who have no idea that an ecoterrorist group has decided to make a devastating example of their world.

A quick scan of the world will detect only one settlement large enough to properly be called a "town." The heroes have been told to land near the largest settlement and unload their cargo.