What was the proportion of knights (nobility) and men-at-arms, compared to mercenaries, compared to peasant levies? Were the levies really mostly poor farmers and the like? The period I'm interested in is between the 10th to 12th century. (Something like William The Conqueror's army in the Battle of Hastings) Thanks in advance.
Ah, Medieval military matters! More can always be said from anyone with the knowledge, so if anyone would like to contribute further, don't let this post stop you! (Just be aware that your post may be further linked to if it's also applicable to later questions. The Medieval Armies Compilation is ever hungry for more posts.)
Most of the answers we're citing today are from u/Rittermeister, so here's a few of their stuff:
u/Hergrim also has an examination of Anglo-Norman armies.