This scenario can be real hard if you're not prepared. Watch out for all the traps. Don't send your dragons off to fight the enemies at the top of the map until all your characters are there. Kill the cure mages ASAP. The treasure chests have good items. Conserve your MP until you get to the top of the map, then unleash everything you got, especially your summon attacks. Gudolf has tons of HP, be ready for a long fight.