The Middle Ages laughs at today's attempts to cage its complexities in simple, easily-expressed terms. More can always be said on the matter if anyone would like to contribute; for the meantime, OP, while u/MI13 focuses a bit more on archers here, they also deal with men-at-arms in so doing. (Assuming, of course, that what I mean when I say 'man-at-arms' is the same thing you mean, which I have learned I cannot rely on when looking at questions here.)