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In my opinion, it was definitely a mistake to linger in the Dungeon. They should have focused all their efforts on clearing a path to the airport on the island, as all the elf units there were weak, so they could have been defeated in waves of heroes (this is only prohibited for mixed units, as I understand from previous discussions).
It's a shame that most people started clearing the Dungeon instead...
The key to success on this map: quickly get to the surface and run around as much as possible, defeating large groups of 7th and 5th level units... thereby completing the experience quests. And don't forget that the last action should be: visiting the tree!
