There's a basic flaw in this question. The issue is that, by the time the concept of chivalry coalesced in the late 12th century, knighthood was in its twilight years as a military institution. There were far fewer knights in circulation than there had been in, say, the mid-11th century, but those who did exist were a wealthier, more privileged, and higher-status class, much more tied to landed estates and less available for military service. Whereas the lords and kings of the 10th and 11th centuries had been able to call upon relatively large numbers of unlanded household or mercenary knights, as knighthood became an exclusive aristocracy in the 12th century, mercenaries and other soldiers had begun to play a far larger role in warfare. This trend of demilitarization would do nothing but continue in the 13th century, ultimately rendering knights almost irrelevant in warfare by the end of that century, and their role as armored heavy cavalrymen was carried on by the men-at-arms of the Hundred Years War.

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