This dissertation aims to understand the daily lives and resistance strategies of a group of Brazilian prisoners of war captured by the Paraguayan army during the War of the Triple Alliance (1864–1870). How were they captured? Who were they? How were they treated? How did they attempt to desert? And what were their fates? These are the central questions that guide this research. Through the analysis of two criminal cases filed in the Paraguayan camp of Paso Pucú in November and December 1867, against Brazilian prisoners accused of desertion and mutiny, it is possible to demonstrate that living, working, and treatment conditions were poor even before their capture; that access to information proved to be a tool for them to continue engaging in the war, even when far from the battlefields; and that their expectations of freedom and strategies of resistance persisted throughout the conflict.