200 Spanish soldiers: Many natives[2] The Battle of Andalien, fought in early February 1550, was a night battle between 20,000 Mapuche under the command of their Toqui Ainavillo and Pedro de Valdivia's army of 200 Spanish soldiers and cavalry with a large number of yanakuna, including 300 Mapochoes auxiliaries under their leader Michimalonco.

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.

The armoured Spaniards' swords and shields, as well as arquebuses and the arrows of the Mapochoes eventually killed about three hundred Mapuche and wounded many more.

Finally the Mapuche were driven back, tired, their ranks thinned and in disorder, their archers without arrows.

After a day treating the wounded they continued onward towards their rendezvous at Penco on the Bay of Concepción with the ships of Juan Bautista Pastene.