In the first battle, I had no chance against the Darkness (although it might have been easier to play as the Dwarves, as they have plenty of runes to remove magic and so on). And I need to remember to always upgrade Light against Darkness to remove all sorts of debuffs; it's just a pity that the Knights have low Magic and Knowledge skills. Although I also had a Paladin who healed from debuffs, but I don't know if he can heal from all of them or not. I used to think that he just restores health)). I focused all my efforts in the battle on the Archers, but they were almost immediately defeated by the Archangels. I had artifacts for them, and the hero had the appropriate specialization, too...
In the second battle, I decided not to sit back and defend, but to attack. Besides, my opponent could reach my units in one turn, so there was no point in defending. And I don't know how to play as the Dwarves. I upgraded Cold Magic because I got an artifact for it at the beginning, and there were spells in the castle.
In the third battle, I was unlucky, and with my first move, I ruined my chances of winning. I had Ents protecting the Archers, and I saw that the Dragon was flying towards the Ent, but for some reason, I decided that the Acid Dragon wouldn't reach the Archers. Oh, I should have put my own Dragons there too, because they moved earlier
Будьте осторожны со своими желаниями. Иногда они исполняются.