I read all the comments, and many people had some difficulties, but I don't know, the mission seemed very easy to me. The only thing is that it took quite a long time to complete, because I set a goal to take all the heroes through all the upgrade paths. Otherwise, I systematically captured all the castles, cleared the entire territory, built everything to the maximum, and when I came to fight Isabel, her army consisted of 11 Archangels and 35 Paladins..., and I had 114 Archangels, 145 Paladins..., and moreover, her army didn't increase at all, so the battle turned out to be quick and easy. Well, if necessary, I could have gathered an immeasurable undead army.