Battle of Dasol Bay
Early the next day, Harder and Haddo attacked and destroyed three coastal defense vessels off Bataan, Harder sinking frigates Matsuwa and Hiburi; then, joined by Hake that night, they headed for Caiman Point, Luzon. At dawn 23 August Haddo attacked and fatally damaged Asakaze off Cape Bolinao. Enemy trawlers towed the stricken destroyer to Dasol Bay, and Haddo, her torpedoes expended, informed Harder and Hake the following night of the attack and left the wolf-pack for replenishment at Biak.
Harder and Hake remained off Dasol Bay, searching for new targets. Before dawn 24 August they identified what they thought was a Japanese minesweeper and the three-stack Siamese destroyer Phra Ruang. It was later found out to be Kaibokan CD-22 and PB-102 (ex-USS Stewart (DD-224)). As Hake closed to attack, the destroyer turned away toward Dasol Bay. Hake broke off her approach, turned northward, and sighted Harder's periscope about 600?700 yards (550?640 m) dead ahead. Swinging southward, Hake then sighted the CD-22 about 2,000 yards (1,800 m) off her port quarter swinging toward them. To escape the charging escort, Hake started deep and rigged for silent running. At 07:28 she heard 15 rapid depth charges explode in the distance astern. She continued evasive action that morning, then returned to the general area of the attack shortly after noon. She swept the area at periscope depth but found only a ring of marker buoys covering a radius of one-half mile.
The vigorous depth charge attack had ended the career of Harder with all hands. The Japanese report of the attack concluded that "much oil, wood chips, and cork floated in the vicinity."
Dubbed "Hit 'Em Again, Harder," she had wreaked havoc among Japanese shipping. Her record of aggressive daring exploits became almost legendary. All six of her patrols were designated successful.