In the middle XVIIIth century, the "Tratado de Madrid" (1750) took place between Portugal and Spain. Both countries were looking forward to define the new southern Latin America frontier. The Tratado de Madrid had a strongly impact over the indians communities under Jesuits influence, starting colonial rebellion named Guaranitc War (1754-1756). During this period an intense communication by mail between the Spanish authorities, priests and the Guarani was noticed. The "indios principais" - the Missions writing elite - expressed their opinion writing letters in the way to cancel the Tratado de Madrid. The different kinds of documents produced by the insurgent Guaranis letters, notes and messages- let us to rethink the relation between the indians and the writing culture. It also indicates the lack of attention in the historical debate to the native point of view expressed by writing.
Guarani missions; Guaranitic War; writing indian; writing practices