This article analyses the military and political participation of the Mapuche people during the early years of Ferdinand VII’s second reign, mainly between 1814-1825. It is part of a larger scholarly discussion about the causes and consequences of the Restoration of the monarchy in Chile, focusing on the interventions of various Mapuche territorial units at the south of the Biobío River. The central hypothesis presented here is that the Mapuche strategy of shifting alliances explains the relatively long duration of the war in Chile -and, therefore, of the Restoration- when compared with other areas of South America where disputes with the royalists were largely settled by the end of the 1810s. The sources indicate that during the socalled “...