Take archers with healing magic. Run through the battle to rithrin in the top north west corner. Run down a little bit. DO NOT RUN THROUGH THE BATTLE! wait till the orcs nearly reach the north east corner of the map. After this continue on with rithrin to the heart. Use ice weapons to defeat the 4 units of fire elementals. after that mission completed. hope this helps.
People i need help defeten the Ellen campain im in the Cave and it sucks they always come and come and im geting Angry