The Naval Battle of the Riachuelo is fought on the rivulet Riachuelo (Argentina), between the Paraguayan Navy on one side and the Brazilian Navy on th...

The Naval Battle of the Riachuelo is fought on the rivulet Riachuelo (Argentina), between the Paraguayan Navy on one side and the Brazilian Navy on the other. The Brazilian victory was crucial for the later success of the Triple Alliance (Brazil, Uruguay, and Argentina) in the Paraguayan War.