Battle of Tuyutí
1866 CE.
Shown on the map at -27.204°, -58.548°.
The Battle of Tuyutí (Tuiuti in Portuguese) was a Paraguayan offensive in the Paraguayan War targeting the Triple Alliance encampment of Tuyutí. It is considered to be the bloodiest battle ever in South America. The result of the battle was an Allied victory, which added to the Paraguayan troubles after the loss of its fleet in the Battle of Riachuelo. This battle is particularly important in Brazil, being nicknamed "A Batalha dos Patronos" (The Battle of the Patrons) since the Army's patrons of the Infantry, Cavalry and Artillery fought in it. The Battle of Tuyutí also marks the Brazilian Army's Infantry Day due to the loss of brigadier general Antônio de Sampaio (known as Brigadeiro Sampaio), patron of the Infantry, while holding his position at the head of his Divisão Encouraçada (Ironclad Division, the 3rd Division). Another Paraguayan attack on the Allied camp was repelled in November 1867.
Text from the Wikipedia article Battle of Tuyutí, licensed CC BY-SA 4.0.