In South America, Argentinian and allied troops temporarily recapture the river port of Corrientes

To strike at its main enemy Brazil, Paraguay had invaded another neighbor, Argentina, after its president had refused peaceful passage of troops from either combatant. Paraguayan naval units had captured Corrientes, an Argentinian port on the Parana River in mid-April. Argentine and allied forces made a bold sortie and recaptured the town after heavy fighting.  They had to soon relinquish the port but had scored a morale boosting early victory, on the Argentinian national day, in what would be a long war.  (By John Osborne)