Bartolome Mitre was replaced as commander-in-chief by the Duke of Caxias, who was forced to enroll slaves to increase the size of his armies.  
The first naval battle in this war was fought at Riachuelo, near the city of Corrientes, while ironclads were later used to destroy the fortress at Humaita and bombard the suffering capital of the losing party. Bartolome Mitre was replaced as commander-in-chief by the Duke of Caxias, who was forced to enroll slaves to increase the size of his armies.  Land cessions in the Mato Grosso and Gran Chaco resulted from this war, which was sparked by Brazilian intervention in the Uruguayan factional struggle of the Blancos and Colorados. FTP, identify this disastrous war fought by Francisco Solano Lopez, which decimated the male population of Paraguay.
The first naval battle in this war was fought at Riachuelo, near the city of Corrientes, while ironclads were later used to destroy the fortress at Humaita and bombard the suffering capital of the losing party.
War of the Triple Alliance