The rich part wasn't always true. With it's heavy use and many varying degrees of large swords, oft times weaponry was retrieved by those that survived. I agree with GG in the well trained aspect. Most times the opposing force for the knights were whatever rabble decided to try a civil war or a more barbaric culture, and subsequently were more interested in their own survival than continuing the fight. Which means they broke and ran and were trampled.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf