Wizard – “The Triumvirate” [Campaign 6, Mission 3]

Guys, I need help!!! I have this problem. I rushed through with Zephyr, like the wind, to the Dungeon, spent a week and a half wandering through the dark and creepy depths, and freed Godric. I gathered a few more troops, and Godric passed through the garrison, which expressed its respect to him (Godric), but didn't join. Then, again with this old man (who dies in the expansion), I capture Gryphonville, and exactly two days later, two heroes appear, one stronger than the other. After the first assault, I couldn't believe my eyes... in the garrison, there was only one... Godric. Not a single unit. I quickly bought him 10 swordsmen. And the second enemy hero arrives the next day, and all he has to do is loudly fart to blow Godric and the unfortunate swordsmen away.
Maybe the city should be captured by Zephyr. But Ellaine (1 enemy hero, level 24), and a mage - I don't remember, but Godric is barely level 17. These weaklings in the scenario need to be beaten relentlessly by smashing the monitor with their faces for such treatment of gamers. Help, maybe I did something wrong?