In South America, a Brazilian river fleet defeats Paraguayan naval forces at the Battle of Riachuelo
Attempting to advance down the Parana River in Argentina, Paraguayan naval forces attacked the Brazilian fleet a few miles downstream from the captured river port of Corrientes. Eight poorly equipped vessels energetically fought a force of nine Brazilan warships but superior firepower won in the end. After several hours fighting, three Paraguayan vessels were sunk and their commander and several hundred of his men killed. (By John Osborne)
Robert L. Scheina, Latin America’s Wars: The Age of the Caudillo, 1799-1899, Volume I (Dulles, VA: Potomac Books, Inc., 2003), np.