Man vs Kzin

From 'The Ringworld Engineers'

The Man-Kzin wars were long over when Louis Wu was born. Men won them all. The kzinti have always had a tendency to attack before they are quite ready. Civilization on Canyon is a legacy of the Third Man-Kzin War, when the human world Wunderland developed a taste for esoteric weapons.

Which is not to say that it was a cakewalk for the grunts fighting the wars, just that they won.

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