Star Trek: New Earth, Book 4: The Flaming Arrow

Beyond the borders of the Federation, Kirk must bring peace and security to the final frontier. His new mission: to defend an isolated human colony an a newly discovered world, deter aggression from neighboring alien races, and ensure the survival of a brave new Earth!
The Flaming Arrow

Belle Terre's stubborn colonists have survived the countless hardships and natural disasters of their new home, only to face a deadly foreign enemy. The alien Kauld, intent on claiming the world's unique resources for their own are determined to destroy the human settlements at any cost. Months away from any hope of Starfleet reinforcements, the Starship Enterprise™ is all that stands between Belle Terre and an all-out alien invasion. But Kirk and his valiant crew may not be enough to save the planet from a relentless assault by the ultimate superweapon!