Walkthrough for the "Tribes of the East" expansion.

Hey everyone, can someone help me figure out how to deal with Kujin (the Orc) and Grol in the "Escape to Salvation - The Grand Escape" scenario? My Orc is level 22, and my army is decent, but this unpleasant fellow is quite skilled in summoning magic, and he just keeps summoning and summoning and summoning... The most I've managed to do is eliminate all his summoned creatures except for 978 Greater Demons.