The Combat of the Apa River was a military confrontation on May 12 1867 between Brazilian and Paraguayan forces on a farm near the José Carlos stream, on the right bank of the

Apa River The Apa River (Spanish: Río Apa, Portuguese: Rio Apa) is a river of Paraguay and Brazil. It is a tributary of the Paraguay River, which in turn is a tributary of the Paraná River. It starts in the Amambai Mountains of the Brazilian state of Ma ...

, in the province of

Mato Grosso do Sul Mato Grosso do Sul () is one of the Midwestern states of Brazil. Neighboring Brazilian states are (from north clockwise) Mato Grosso, Goiás, Minas Gerais, São Paulo and Paraná. It also borders the countries of Paraguay, to the southwest, and ...

, on the border between the belligerents. During the Paraguayan occupation of the province, the invaders had dominated a farm in the region, later renamed Fazenda Marechal López, where the ultimate combat took place. There, Paraguayans began to develop gardens and raise cattle. The Brazilian forces of the 17th Battalion of Volunteers of the Fatherland, who would later be part of the campaign called Withdrawal from the Lagoon, approached the farm and started the confrontation, on May 12, 1867. The Paraguayans tried to disable the farm, setting the fields on fire, harassing the cattle, then fleeing.https://www.worldcat.org/title/dicionario-das-batalhas-brasileiras/oclc/36768251

References

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May 1867 events History of Mato Grosso do Sul