Battle of Ponte da Azenha
1835 CE.
Shown on the map at -30.047°, -51.214°.
The Battle of Azenha Bridge (Portuguese: Combate da Ponte da Azenha) was the first battle of the Ragamuffin War, which took place on the night of the 19th to the 20th of September 1835. It gave way to the capture of Porto Alegre by the rebels on the following day.
Text from the Wikipedia article Battle of Azenha Bridge, licensed CC BY-SA 4.0.