On 7 April, she changed course in an attempt to intercept a Japanese naval force which had sortied from Bungo Suido late the day before. It was feared that this task force, headed by "Yamato", the world's largest battleship, would interrupt the assault on Okinawa to the south. Despite her full-power running, "Trutta" did not intercept the Japanese ships because they changed their course. Nevertheless, the Japanese force did not reach Okinawa because on that day fliers from the carriers of Vice Admiral Mitscher's Task Force 58 sank "Yamato", light cruiser "Yahagi", and destroyer "Hamakaze", and inflicted irremediable damage to three other destroyers which the Japanese scuttled. After receiving news of this successful battle, "Trutta" headed southward on 9 April. Proceeding via the Nansei Shoto, she avoided the hostile notice of enemy aircraft and weathered gale-force winds and force-five seas before entering her patrol area in the East China Sea on the afternoon of 11 April. There, she patrolled along the Shanghai-Quelpart Island traffic routes. On 13 April, while pursuing an antisubmarine force of three Japanese destroyers, she passed through an uncharted minefield before the ships changed course and outdistanced her.