 In 1859 Calfucurá attacked Bahía Blanca in Argentina with 3,000 warriors.Many other bands of Mapuche also became involved in the internal conflicts of Argentina until the Conquest of the Desert.To counter the cattle raids (and the native peoples on horseback), in the 1870s Argentina constructed a deep trench, called Zanja de Alsina, to prevent cattle from being driven west and establish a boundary to the raiding tribes in the pampas.