How to win with a “weak” Knight?

The hero gives the army (swordsmen or pikemen for upgrading in the outer building) to the next hero and becomes free. What should he do on the next turn? He can move closer to the "squire" so that he can later pass on the upgraded troops to him.
By the way (this is not about this map), an already built chain can work in both directions. Pass the upgraded troops to the main hero, take the un-upgraded ones from him - and everything goes back through the same chain - to upgrade...