Return to War in Bloomington, MN

Four Space Commandos in a Desperate Fight Against an Army of Alien Raiders...
The Britynons were the only race to receive the Federation's most severe punishment-confinement to their own solar system. Commando-Colonel Islaen Connor well remembers the rape of her homeworld by these off-worlders. They come as locusts, stripping a planet of its resources, returning nothing.
Now the Britynons have come in secret to another world, beautiful and primitive. Islaen Connor vows to stand between the renegades and the fate they plan for the planet and its people-even if it means death for her and her three comrades...
"Excellent SF Adventure!"-Andre Norton