only a suicidal person would place a mage in the front ranks to be shot at. And the mage will stand so far back that the angel won't be able to reach the hero immediately. You'll be killing angels with squires and spearmen for a long time. And I'll have only Crusaders, without monks (although if I find a unit that produces monks, I won't refuse). And monks won't do much damage to angels with a single attack.
It depends on how many squires, monks, and spearmen there are, plus what the hero can do.