what was the main role of knights in the European feudal system in the Middle Ages if u don't know don't answer

Knight service, in the European feudal system, military duties performed in return for tenures of land. The military service might be required for wars or expeditions or merely for riding and escorting services or guarding the castle.

Explanation:

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walter cronkite's special interview from vietnam had which of these effects? oijohkn

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