The waterfall setting of the film suggests the combination of these events with the story of older missions, founded between 1610–1630 on the Paranapanema River above the Guaíra Falls, from which Paulista slave raids forced Guaraní and Jesuits to flee in 1631. The battle at the end of the film evokes the eight-day Battle of Mbororé in 1641, a battle fought on land as well as in boats on rivers, in which the Jesuit-organised, firearm-equipped Guaraní forces stopped the Paulista raiders.