Not enough power to crash Sulla. "Stand Alone".

Hi dear readers,

I did a pretty good job to buildup enough armypower to beat Sulla with "Stand Alone". There is no way to let surrender Sulla. He is to strong. Whet can I do to solve this? Play the game again? I don't wanna use cheats.'

Is there a possibillyti to use the army of King Arthur instead the army of Morgan Fay?

Thanks for a answer!