Heroes of sword or magic?

You should read the entire post carefully. At the beginning, the Warrior doesn't need an army; it only serves as cannon fodder to capture something valuable. He breaks through everything with potions and his own strength. Therefore, he can easily move around without an army and still defeat a small mage's army, either in one go or in two.

As for mages, if they are not Chaos or Druid mages, they can't do much without an army, and even these two "independent" types require constant mana control.

Eventually, the Warrior also needs to build an army, which is logical. But with only attack and defense bonuses, his army won't go far in a battle against a mage. Without Dispel, it's better to surrender immediately.