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The Battle of Mazocoba, or the Mazocoba massacre, was a major engagement of the Yaqui Wars that was fought in Sonora, Mexico. On January 18, 1900, a Mexican Army expedition encountered hundreds of Yaqui renegades about twenty miles east of Guaymas. During the battle that followed, several hundred people were killed or wounded and over 1,000 Yaquis were taken prisoner.