After several sallies, the Spaniards resolved to abandon the fort and to retire to _Puren_. Caupolican having destroyed this fortress, led his troops to attack that of _Tucapel_, the commander of which likewise retreated to _Puren_. This fort was also destroyed. No sooner had Valdivia, who was at that time in _Conception_, learned of the siege of _Arauco_, than he marched upon that place with such forces as he could muster. On approaching within a short distance of the enemy’s encampment, he sent forward Diego del Oro to reconnoitre with ten horsemen. This detachment falling in with a party of Araucanians, were all slain and their heads were suspended to trees. The Spanish soldiers, on arriving at the spot, were so filled with horror at the unlooked-for spectacle, that they were anxious to return. Their commander, too, felt some misgiving at having disregarded the advice of some of his senior officers, who had dissuaded him from advancing; but he nevertheless continued his march, and on the 3rd of December 1553 came in sight of the enemy’s camp. [Sidenote: 1553] The two armies continued for a long time to observe each other. At length Mariantu, who commanded the right of the Araucanians, moved against the left of the Spaniards, who marched to meet him. This detachment was surrounded and cut in pieces, as was another which was sent to its assistance. The action soon became general, both sides displaying equal valour, and having an equally brave example in their respective commanders. The Araucanians, notwithstanding the slaughter made amongst them by the firearms of the enemy, continued to supply with fresh troops the places of those who were slain. At length, after a great loss, they were thrown into confusion and began to give way, notwithstanding the heroic exhortations of their leaders. It was at this crisis that a young hero appeared upon the scene in the person of Lautaro, an Araucanian youth of sixteen years of age, whom Valdivia had formerly taken prisoner and caused to be baptised and made his page. Lautaro, quitting the Spaniards, loudly reproached his retreating countrymen, and exhorted them to continue the combat, as their opponents, spent with fatigue, were no longer able to resist them. At the same time grasping a lance, he led the way to victory, which at once declared itself for the Araucanians. Of the Spanish army only two escaped. These were Promaucians, who concealed themselves in a neighbouring wood.