The Stars at War (Starfire combo volumes Book 1)

In the period of peace following the Human-Orion War, a ship from a half-forgotten history emerges from a warp point notorious for sevouring ships and opens fire on the Orions, in Crusade, while five thousand years after Sun Tzu writes The Art of War, his advice is followed during the Fourth Instellar War between the terible Bugs and the humans, who are aided by their catlike Orion allues, in In Death Ground.