I placed the Main/Helper and 4th Squad on the Camp with the button, so the 2 strong ones (Main Squad currently has almost 60k) can try on the upper boss. 2nd Squad goes from the middle Camp to go with the 4th one the southern route, to have 2 squads to throw at the boss. The 3rd started on the northern Point, just for that one group of enemies. Got it in the 13th try. :S

If somebody needs help with a strong Squad ID:138207507