Spanish forces clash with indigenous Huilliches of southern Chile in the battle of Río Bueno.

The Huilliche, Huiliche or Huilliche-Mapuche are the southern partiality of the Mapuche macroethnic group in Chile and Argentina. Located in the Zona Sur, they inhabit both Futahuillimapu and, as the Cunco or Veliche subgroup, the northern half of Chiloé Island. The Huilliche are the principal Indigenous people of those regions. According to Ricardo E. Latcham the term Huilliche started to be used in Spanish after the second founding of Valdivia in 1645, adopting the usage of the Mapuches of Araucanía for the southern Mapuche tribes. Huilliche means 'southerners' A genetic study showed significant affinities between Huilliches and Indigenous peoples east of the Andes, which suggests but does not prove a partial origin in present-day Argentina.

The Battle of Río Bueno in 1759 was a military engagement between Spanish colonial forces and local Huilliche in the Bueno River of south-central Chile. The battle was fought on January 27 with the Spanish forces led by Juan Antonio Garretón. The battle of 1759 was an exception to the overall policy of befriending indigenous communities on behalf of the Spanish authorities in Valdivia.

January 27 is the 27th day of the year in the Gregorian calendar; 338 days remain until the end of the year.