Classification: Fixed defense, heavy
Tactic: Several waves, each meaner than the last
An elite garrison is the strongest thing a sector leaves sitting still. The first wave is the greeting. The later waves are the argument. Their guns are better, their shields are thicker, and the captains talk to each other.
They put fire on whatever is already hurt, and they use a gap in a shield the moment it opens. They are not a random patrol that wandered into range. They live here.
What they are sitting on is why the fight is worth having. Beat them and the sector is yours to tend. Lose, and it stays theirs.