“Lautaro was a spontaneously creative genius, gifted with a powerful military imagination.” (Encina) Eager to give a military warning to the indigenous people and re-establish the fort of Tucapel, Pedro de Valdivia gathered a group of men that, in anticipation of the reconquest, directed their steps to toward the Nahuelbuta mountain range. During the year 1553 when, among the ruins of the destroyed Spanish bastion, the battle took place, where the Mapuche chief would deploy his seasoned and intelligent military strategy, methodically attacking some of their troops. Meanwhile, the rest, that comprised the rear guard, reinforced the fight and in this way, defeated the Spanish.