Man-Kzin Wars X
Man-Kzin Wars X: The Wunder War, by Larry Niven and Hal Colebatch.
Back in the Dark Ages I was a teenage Larry Niven fan and I geeked out on all his whacky Known Space worlds like Wunderland, Jinx, We Made It, Plateau, and of course, the ultimate sf geek world concept, Ringworld. Niven admitted at one point that the reason he had never set any stories in the period of the Man-Kzin Wars was that he felt he was no good at writing military sf. So instead, he invited other writers to come in and play in his sandbox and write war stories for Known Space. It’s been a successful collaboration: ten books so far, and I doubt they’re done yet.
Plucky humans fighting giant alien cats. What can I say? It’s a guilty pleasure.