How do I complete the final mission playing as Roland?

Thanks to those who advised me to rush to the center of the map to the castles with dragons! I just completed it using that method:smile03:, and I went there late (I don't remember exactly, but Roland already had a small army: 12 giants, 8 crusaders, 10 upgraded knights, 64 upgraded dwarves, and some others) and instead of completing mission 8, I completed mission 7 (where you have to find the crown).
In the end, I gathered dragons and titans and defeated all the enemies on the continent; however, Archibald's army was impressive (there were 48 black dragons alone:eek:).

By the way, did anyone else have a bug where the enemy (in my case, the green) hero teleported across the river north of the castle with the titans and got stuck in the desert near the pyramid? For almost the entire mission, he wandered around it and only "detached" when the green player had no more cities:D.