Currently the argument that a war juncture serves to appreciate the interests and motivations of the social groups involved in it, is key to the study processes of the independence in Latin America. In that sense, this research analyzes the war of propaganda war unleashed in the press of Lima and Buenos Aires, in the context of the wars of independence since the revolution of May 1810, the war of perception in the Alto Peru and the independence of the United Provinces of l Rio de la Plata in 1816. The propaganda war denoted in these spaces a political speech in struggle, conflicting interests and the importance of reflecting about the military war and about the war of words in a period where political legitimacy was in crisis.