"Sailfish" fired four torpedoes, scoring two hits. Leaving the target aflame and dead in the water, "Sailfish" dove, the escorts delivering forty depth charges in the next 90 minutes. She eluded destroyers and aircraft and arrived at Fremantle, Western Australia, on 19 March, to great fanfare, believed to be the first U.S. sub to have sunk an enemy carrier. In reality, the Kaga was scuttled in June, 1942, after damage sustained during the Battle of Midway, in that vicinity. Postwar, it was revealed "Kaga" had been nowhere in the area of Lombok Strait, and the target had in fact been the aircraft ferry "Kamogawa Maru", still a valuable target. The Java Sea and Celebes Sea were the areas of "Sailfish"s fourth patrol, from 22 March–21 May. After delivering 1,856 rounds of anti-aircraft ammunition to "MacArthur's guerrillas", she made only one ship contact and was unable to attack the target before returning to Fremantle. The submarine's fifth patrol—from 13 June through 1 August—was off the coast of Indochina in the South China Sea. On 4 July, she intercepted and tracked a large freighter, but discovered the intended target was a hospital ship and held her fire. On 9 July, she intercepted and torpedoed a Japanese freighter. One of a pair of torpedoes struck home and the ship took a 15° list. As "Sailfish" went deep, a series of explosions were heard, and no further screw noises were detected. When the submarine surfaced in the area 90 minutes later, no ship was in sight. Though she was credited during the war with a ship, postwar examination of Japanese records confirmed no sinking in the area on that date. [In fact the "Sailfish" had damaged the Japanese transport ship Aobasan Maru (8811 GRT) off the coast of Indochina in position 11°31'N, 109°21'E.]  "Sailfish" observed only one other enemy vessel before the end of the patrol. Shifting her base of operations to Brisbane, "Sailfish" (now under the command of John R. "Dinty" Moore) got underway for her sixth patrol on 13 September and headed for the western Solomon Islands. On the night of 17–18 September, she encountered eight Japanese destroyers escorting a cruiser, but she was unable to attack.