On 13 April an enemy plane sighted "Harder" north of the western Carolines and reported her position to the patrolling Japanese destroyer "Ikazuchi". As the enemy ship closed to within "Harder" fired a spread of torpedoes that sank the attacker within five minutes. Dealey's terse report became famous—"Expended four torpedoes and one Jap destroyer." Four days later "Harder" spotted a merchant ship escorted by destroyers. Firing four torpedoes, she sank the 7,000 ton "Matsue Maru" and damaged one of the escorts. Then, adding to the enemy's misery, she returned to Woleai where she surfaced on the morning of 20 April to deliver a shore bombardment under cover of a rain squall. She terminated this highly varied and successful patrol at Fremantle submarine base, Western Australia 3 May.