One evening during a full moon the Chiras mounted a surprise attack. They watched and plotted as the Chorotegas celebrated the anniversary of their arrival to their promised land. The Chorotegas made offerings in the sacred temple they called the teyopa, drank chicha, a beer made from fermented corn, and danced well into the night.
When they were sure the Chorotega warriors were asleep, or too intoxicated to defend themselves, they attacked. The Chiras slaughtered a number of Chorotegas, then headed for the teyopa to plunder the precious jewelry and golden artifacts.