forced deep by destroyer escorts. On 1 February, as the submarine approached Bangka Strait, she was detected by an enemy destroyer which made a fruitless depth charge attack. In return, Snapper fired two torpedoes but both failed to find the target. Snapper arrived at Soerabaja, Java, on 10 February and then continued on to Fremantle, Western Australia. Snapper departed Fremantle on 6 March for the approaches to Tarakan and her second war patrol. Finding no suitable targets there, she was directed to Davao Gulf where, on 31 March, she closed a large armed tender or auxiliary cruiser. She fired two bow torpedoes at and, after reversing course, came to periscope depth to observe the enemy ship dead in the water. After firing one torpedo from her stern tube, she was forced deep to evade an attacking escort ship. Later that night, she was ordered to Mactan Island to unload ammunition and take on board 46 tons of food for the besieged island of Corregidor. Arriving there on 4 April, she transferred her cargo to submarine rescue vessel , took on board 27 evacuees, and headed back to Fremantle, evading Japanese destroyer patrols on the way. On 23 April, Snapper received word that was in trouble and reversed course to go to her aid. After towing the stricken submarine to Fremantle, she sailed for Albany and then returned to Fremantle. Third and fourth war patrols Snappers third war patrol was conducted in the Flores Sea, Makassar Strait, and the western Celebes Sea. Despite intensive efforts, the submarine found no worthwhile targets and returned to Fremantle from a disappointing patrol on 16 July 1942. On 8 August 1942, Snapper headed for the South China Sea and her fourth war patrol. On 19 August, she fired two torpedoes at a cargo ship but lost contact when forced to evade an escort ship. The only other targets sighted during this patrol were at too great a distance or on a course and speed that prevented the submarine from closing. On 28 September 1942, a PBY-5 Catalina flying boat of U.S. Navy Patrol Squadron 101 (VP-101) mistook her for a Japanese submarine and attacked her in the Indian Ocean south-southwest of Bali at a position given by Snapper as and by the PBY-5 as . Snapper crash-dived, and the PBY-5 dropped one depth charge that shook Snapper as she passed through a depth of on