ON 25/AUG/42, THREE DAYS FOLLOWING BRAZILIAN DECLARATION OF WAR ON AXIS, THE SOUTHERN NAVAL FORCE WAS CREATED. INITIALLY DENOMINATED SOUTHERN PATROL GROUP, IT INCORPORATED THE OLD TORPEDO BOATS SANTA CATARINA, SERGIPE, MARANHÃO,MATO GROSSO,PIAHUY AND SURVEY VESSEL JACEGUAI, CONVERTED INTO CORVETTE