The Space Barbarians — Mack Reynolds

John of the Hawks was a proud, young man, proud of his people, proud of his heritage, and proud of his ability to count coup on his clann's traditional enemies. He knew what was right and what was wrong - the four great books had laid down the way things had to be. Which is why the uncouth ways of the clannless drifters from space outraged him so. Not only did these peddlers know nothing of the finesse of proper combat, they knew nothing of the respect due to such things as the coup stick, the right way to capture a wife, and the sanctity of the clann's elders. Worse still, they had some idiotic notion that that cheap silvery metal so commonly used for plumbing and horse-bits, known as platinum, was somehow of special merit. Well, one could excuse an outrage or two on the grounds of ignorance, but there came a time when any good clannsman, such as John certainly was, must decide to teach these barbarians from space a lesson!