How to win with a “weak” Knight?

by the way, does anyone actually use peasants? :)

Only at the very beginning of the game. The idea is this: archers shoot at everyone they can reach; peasants attack everyone who manages to get close to the archers. But it's just cannon fodder.

Yes, and it's also very important that the peasants attack first - otherwise, with their low health, there will be no one left to retaliate.))