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Godrick only has a large second army on the Hero difficulty. Even on Veteran, he can be easily defeated.
I also started playing Heroes with the campaign. Before that, I hadn't played any other Heroes games. I just completed all the campaigns on Warrior first, and then I started playing on Hero. Even during my first playthrough, I read on the forum that Godrick is a participant in the final battle. So, in this mission, I tried to level him up.
On Warrior, I didn't level Godrick up to level 24 because the neutral creatures ran out, and the heroes were fleeing the battlefield. I could have hunted the neutral creatures that appear on certain weeks, but I got tired of it.
On Hero, Godrick leveled up before the neutral creatures ran out. After that, I only focused on clearing out the resource locations.
Soon, I will be playing this mission in version 3.0 (I'm currently playing version 4). There may also be problems with leveling up Godrick if I can't level up Isabella's mentoring skill. In this version, on Hero difficulty, the enemies flee the battlefield, while on easier levels, they fight to the last.