 After about ten days he turned toward the sea marching to a plain between the Bio-Bio and Andalién River with a lake protecting his camp on one side.Here he stayed for two days and nights.On the second night the Toqui Ainavillo and 20,000 warriors in three divisions, came out of the local wooded hills and advanced on the Spanish camp believing the night would render the Spanish horsemen ineffective and possibly make the horses timid.