Man-Kzin Wars IX

It was so unfair! Here the Kzin were, warcats supreme, bringing the galaxy piece by piece under feline dominion, carving out satrapies for the home planet like the lords of creation that they were - and then they ran into those pesky humans. Mere apes! Contemptible salad-eaters! Taking pride in sneaking up on a leaf! Obviously fit only to be lunch, not even a speed bump in the Kzinti's imperial career. Hardly worth screaming-and-leaping about.
But when the feline Kzin moved in to take over the monkey-occupied worlds - they got clobbered. The humans, with their underhanded monkey cunning, turned communications equipment and space drives into weapons that cut the dauntless Heroes into ribbons. When the humans gained a faster-than-light drive, it was all over but the, uh, howling. The Kzin had lost their first war ever in centuries of conquest.
Still, you can't keep a good warcat down, and the Kzin have by no means given up. New weapons, new strategies, and new leaders - the humans had better keep their powder dry. Once again, it's howling time in Known Space!