In chapters 174 and 175 of History of the Indies, De las Casas transcribes extensive fragments of letters sent by Portuguese Jesuits from Brazil. This exercise of intertextuality supposes a singularity in the general framework of the text, although it received limited attention from colonial studies. I will develop a documentary study (Chartier, Prada) to recognize the probable source used by the Dominican to write those chapters. Then, from an “unfocused” perspective (Cordiviola & Teglia), I will analyze the role these epistles acquire within the historiographical account and their impact in the global shaping a peaceful evangelizing method.