Battle of Colonia del Sacramento
1826 CE.
Shown on the map at -34.470°, -57.847°.
The battle of Colonia del Sacramento (or Colônia do Sacramento) consisted of a series of failed attempts made by admiral William Brown of capturing the town of Colonia del Sacramento, which was under Brazilian control and being sieged on land by insurgent Uruguayan forces, in the context of the Cisplatine War between the Empire of Brazil and the United Provinces of the Río de la Plata. The confrontations began in the morning of 26 February 1826 and ended on 14 March 1826.
Text from the Wikipedia article Battle of Colonia del Sacramento (1826), licensed CC BY-SA 4.0.