as she torpedoed and sank Odatsuki Maru and Chojo Maru. She ended her fifth patrol at Pearl Harbor on 4 March 1944. Sixth patrol, March–May 1944 In company with and , Tinosa got underway for the East China Sea and her sixth patrol on 29 March. Operating off Japan and the Ryukyus, this wolf pack preyed successfully on passing convoys by stationing units along well-traveled routes. The submarines made six major attacks on this patrol. Tinosa herself sank two Japanese cargo ships, Taibu Maru and Toyohi Maru, in a night attack on 4 May. On this patrol, she also sank a trawler with her gun on 9 May and claimed to have damaged three other vessels. The submarine arrived at Majuro on 15 May. Seventh patrol, June–August 1944 After refitting, Tinosa departed the Marshalls on 7 June, bound for the East China Sea. On 18 June, she resorted to unusual tactics in attacking a three-masted 400-ton fishing sampan which had withstood her gunfire. Tinosa closed the enemy vessel, doused her with fuel oil, and set her ablaze by tossing flaming, oil-soaked rags on her deck. Shortly after dawn on 2 July, Japanese planes and patrol vessels forced Tinosa to go deep near Nagasaki and kept her down until dusk. The following day, the submarine sank two passenger-cargo ships in an attack on a convoy, adding Konsan Maru and Kamo Maru to her list of kills. Following this patrol, Tinosa reported to Hunters Point Naval Shipyard, California, on 7 August, for a much needed overhaul. Eighth and ninth patrols, November 1944 – April 1945 Tinosa departed San Diego on 7 November 1944 and proceeded, via Pearl Harbor, to Nansei Shoto to reconnoiter its waters and to test new FM sonar equipment in locating Japanese mines. After 58 days at sea, Tinosa returned to Pearl Harbor. On 17 March 1945, Tinosa got underway from Tanapag Harbor in the Marshalls. Despite unexplained damage in her bow-plane rigging gear, Tinosa proceeded to the Nansei Shoto area and resumed testing the mine-detecting capabilities of her temperamental FM sonar. She also observed Japanese shipping and took reconnaissance photographs before ending the patrol at Apra Harbor, Guam, on 7 April. Tenth patrol, April–May 1945 On 28 April, Tinosa headed for Truk. Her FM sonar equipment—which she had received while at Guam—improved her sonar range, and she gathered data on sonar performance throughout the voyage. On 3 May,