This fort was built as a base to defend against raids by Spanish troops, who were burning the farms and Rukas of the Mapuches south of the Bio-Bío River.

[2] Governor Saravia ordered General Martín Ruiz de Gamboa to lead an attack on the Mapuche fort.

General Ruiz de Gamboa and his army arrived at the hill of the fort on January 7, 1569, on a hot and sunny day.

The Spanish soldiers began to advance up the forested hill, and they fired their Arquebus guns at the fort as they approached it.

The Mapuches continued to chase Gamboa and his men as they retreated to San Felipe de Rauco.