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The Breña campaign, or Sierra campaign, was the last phase of the land campaigns of the War of the Pacific. This stage begins after the occupation of Lima, in February 1881, and extends until the consolidation of the Treaty of Ancón, between October and November 1883, which ends the war, with favorable conditions for Chile.
Villalobos, Sergio (2004). Chile y Perú, la historia que nos une y nos separa, 1535–1883 (in Spanish) (2 ed.). Chile: Editorial Universitaria. ISBN9789561116016.