As air raids against the cities of the Japanese homeland intensified, "Trutta" manned a lifeguard station south of Kyushu, made patrols just off Bungo Suido, and conducted visual and photo reconnaissance of Tori Shima, approaching to within about one mile (1.6 km) of the island. On 21 June, she departed Bungo Suido to join a coordinated attack group (wolfpack) "Street's Sweepers" patrolling the Yellow and East China Seas. She conducted patrols west of Tsushima Strait and then fired a few diversionary rounds of five-inch (127 mm) fire on Hirado Shima before moving west to take up patrol along the southwest coast of Korea. On 1 July, her persistence paid off when, after pursuing a sailing vessel, she discovered a fleet of schooners. Working quickly to take advantage of surprise and to prevent the ships from fleeing to nearby shallow water, "Trutta" sank seven of the three- and four-masted schooners in a four-hour action. Crew members boarded and searched two of the vessels and put the schooner crews in lifeboats before destroying the ships.