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I probably spent a whole week struggling with this mission. Finally, I won. I didn't use any summoning magic; Markel doesn't have any, and I didn't poison anyone. I also didn't go to the Sphinx. I built up my cities. Isabel just sat in the city, and I hired another hero who helped Markel with "supplying" the army. This helper ran around, improving the army in the lower fortress (it's much cheaper that way). Well, and the day before the lunar eclipse or whatever it was, I managed to send Markel on wings to Godric, and I won!