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BRIT, since you've explored the entire Dungeon, you already know where Godric is. I also didn't find him right away, even though I played this mission in version 1.5 (now I'm playing it in version 3.0). By that time, Elaine, with a decent army, had already crossed the garrison and was heading towards the Dungeon.
I started the mission again and immediately ran to free Godric, clearing only what was in the way to the prison. I just made a detour to the peasant huts. Godric is maxed out.
After that, everything went as easily as in version 1.5. The garrison joined Godric. Elaine holed up in the farthest Necropolis. Godric easily defeated Rutger and captured the nearest Castle. And then all the others.
In the final battle, all 3 heroes must defeat Markel without reloading. So, I strengthened Zehir with knight troops. Faidaen had enough elven troops. There was a week of elven archers. They appeared on the map in large numbers. More than 100 joined Faidaen. With the other heroes, I tried not to touch them if I could avoid it.
Of course, all the heroes must max out their stats and visit all the upgrade locations before the battle with Markel. They will also have to fight Biara and the Master in the final mission.
If Godric is not well-leveled, there may be problems.