sentences:  However economical and geopolitical reasons together with increasingly negative attitudes towards the Mapuche made Chilean authorities decide to seek an incorporation of Araucanía, by arms if necessary.Mapuche chiefdoms responded in different ways, some aligned with Chile, other declared themselves neutral while a substantial group led by the Arribanos sought to violently oppose the advance of Chilean settlers and military.In the first ten years (1861−1871) Mapuches could not prevent Chile from advancing its positions but managed to defeat in detail small detachments avoiding large battles.