This is the fourth mission at the Field of Angry Giants.
A brigade of Bonedeth guard a Cyclops. Destroy them and the Cyclops to find a Bonedeth fortress. Past this is another team of Bonedeth and a Cyclops, plus a Bonedeth house. The only problem here is getting burnt to death by the fires, but after this you'll reach the goal. If you catch fire, you can stop the havoc with the Party song (PATA PON DON CHAKA).
If you want experience early on, this is the place to get it. If you can defeat a few Cyclops and hold off groups of Bonedeth, you're good to go. Remember to use the Dodge song (PON PATA PON PATA) when the Cyclops are about to attack. Playing this mission a couple of times before attempting the Archfiend of Valor may result in the mission being slightly easier for you. If you have a high level, and play this level, you won't have any exp for you units.