Two days later, "Healy" and the other ships steamed out to join Admiral Mitscher's carrier task force as the Japanese made preparations to close the Marianas for a decisive naval battle. The great fleets approached each other on 19 June for the biggest carrier engagement of the war: the Battle of the Philippine Sea. As four large air raids hit the American dispositions, fighter cover from the ships of "Healy"s task group and surface fire from the ships decimated the Japanese formations. With able assistance from American submarines, Mitscher succeeded in sinking two Japanese carriers in addition to inflicting fatal losses on the enemy naval air arm during "The Great Marianas Turkey Shoot" on 19 June. "Healy" helped rescue pilots from downed aircraft on 21 June, and arrived Eniwetok on 9 July. The Marianas invasion had been secured and the enemy threat turned back.