Question

In feudalism a knight must _____. protect serfs from unscrupulous vassals? pay fiefs to a vassal? be ready to defend his vassal's territory as part of a "standing army"? be responsible to his lord for the agricultural output of the serfs under his control?

Answer 1

I think it is, be ready to defend his vassal's territory as part of a "standing army"

Answer 2

In feudalism a knight must be ready to defend his vassal's territory as part of a "standing army"?