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Zeratul, we have different starting conditions. It was much easier for me because I had a very well-leveled Godric. With a human army, he crushed everyone.
In the first campaign, I leveled him up to level 24. In the third campaign, they reduced his level to 10, but kept all his skills, abilities, and characteristics. He leveled up again to level 20, which means he was almost equal to a level 34 hero. Plus, he obtained all the level-up bonuses in these missions. Of course, he had all the spells of light magic.
If you want to have one like that, replay the 5th mission of the 1st campaign and the 2nd mission of the 3rd campaign and level up Godric to the fullest. You don't need to replay the 5th mission of the 3rd campaign, which I struggled with for a long time because of the leveled-up Godric.