Walkthrough tips, Discussion of Campaigns [Heroes 5]

Well... I started playing as the dark elves... Why the hell did they shove some cheater right into the first mission? He's level 21, and my limit is 12!!! Moreover, it's obvious that he hasn't leveled up at all—stats are each from 1 to 3... Damn, what kind of nonsense is this? It would be fine if not for the damage based on his level. He was taking out 2 hydras or even 3(!!!) shadow witches in a single hit! %) What kind of tournament is this supposed to be? Plus, he has an unimaginable army, much larger than mine. Well, I won't go on about that too much; probably just a lack of skill on my part. But why the level? By the way, I killed this cheater. And everything would have been fine, but the strongest of the remaining enemies came and finished off the remnants of my army, which had no hydras, witches, or furies left—only 3 grim raiders, a couple dozen assassins, and 26 minotaurs. The enemy had full mana, 20 grim raiders, a bunch of minotaurs, 63 beasts, 34 furies... In short, I have no idea how to complete this. In principle, if you try hard enough, it's possible...