Following shakedown from New London, Connecticut, Gurnard sailed for Rosneath, Scotland, 2 November 1942 and reached that port 13 days later. Her first war patrol, 28 November to 27 December 1942, brought her to the Bay of Biscay where she lay off the Spanish coast awaiting Germanblockade runners bound for Spanish ports. The patrol was uneventful; no enemy ships were sighted and subsequently Gurnard returned to New London 9 February 1943 for repairs and alterations.
Pacific Patrols
Second, third, and fourth war patrols, May 1943 – January 1944
After reaching Pearl Harbor 26 May, the submarine got underway 12 June for her second war patrol. She patrolled off Toagel Mlungui Passage and on 29 June saw action for the first time, damaging two Japanesemerchantmen and surviving 24 depth charges thrown by an enemy destroyer. Varied damage was inflicted on other ships in these waters before Gurnard made her first kill, sinking cargo shipTaiko Maru at 12°53′N131°49′E / 12.883°N 131.817°E / 12.883; 131.817. on 11 June 1943. Having expended all torpedoes, the submarine returned via Midway Island to Pearl Harbor, arriving 26 July for refit.
On 6 September, she set sail once again, this time heading towards the South China Sea for her third war patrol. In the early hours of 7 October, a five-ship convoy came into view, prompting Gurnard to initiate a pursuit. By 01:39 on 8 October, Gurnard had closed in on the convoy and successfully sunk the cargo ship Taian Maru and the passenger-cargo ship Dainichi Maru west of Luzon. This highly successful patrol concluded on 28 October when Gurnard arrived at Pearl Harbor.
One month later she sailed on her fourth patrol to prowl off the southeast coast of Honshū and soon found good hunting. A convoy was sighted 24 December and at 07:10 Gurnard attacked. Two minutes later cargo ship Seizan Maru No. 2 had broken in two and sunk; she was soon joined by cargo ship Tofuku Maru. Japanese destroyers attacked the submarine with over 80 depth charges without success. After damaging another merchantman on 27 December, Gurnard returned to Pearl Harbor 7 January 1944. From there she was sent Stateside for overhaul.
Fifth, sixth, and seventh war patrols, April – November 1944
Following overhaul at San FranciscoGurnard departed Pearl Harbor 16 April on her fifth war patrol, bound for the eastern Celebes Sea. On this patrol she chalked up one of the highest single-patrol tonnage scores of the Pacific war, attacking the Take Ichi convoy on 6 May and sinking 6,886-ton cargo ship Tenshinzan Maru, 6,995-ton passenger-cargo vessel Taijima Maru, and 5,824-ton passenger-cargo ship Aden Maru. Nearly a hundred depth charges rained down around her but she eluded the hunters and escaped undamaged. This vital convoy carried 40,000 troops intended to oppose Gen. MacArthur in New Guinea, and the embarked units suffered losses of nearly 50 percent. Gurnard's next kill occurred 24 May when several torpedoes sent to the bottom the 10,090-ton tanker Tatekawa Maru. No further opportunities presented themselves; and Gurnard put in at Fremantle, 11 June 1944 with the completion of the patrol.
The submarine stood out on her sixth patrol 8 July for the Banda, Molucca, Celebes, Sulu, and Mindanao Seas. After topping off at Darwin she patrolled off the Peleng Straits and damaged one merchantman before returning to Fremantle 5 September.
Gurnard's seventh patrol commenced 9 October after refit. While cruising off Borneo, she detected a five-ship enemy convoy. A successful attack was pressed home 3 November at the end of an 18-hour hunt, and two torpedoes demolished cargo ship Taimei Maru. Gurnard returned to her Australian port 17 November after this victory.
Eighth and ninth war patrols, December 1944 – May 1945
The submarine's eighth and ninth patrols (11 December 1944 – 1 February 1945 and 10 March – 9 May 1945) included reconnaissance off Camranh Bay and patrols with submarines Hammerhead and Boarfish, but hunting was poor and no ships were sunk. Gurnard finished her final patrol at Pearl Harbor 9 May and put in at Mare Island, California, nine days later for a major overhaul. Following a round-trip voyage thence to Pearl Harbor and Midway, she returned to San Francisco 11 September 1945 and decommissioned there 27 November 1945.
Gurnard remained in reserve until 1 July 1949 when she reported to the San Francisco Naval Shipyard for activation as an armory for naval reserve submarine training. Towed to Pearl Harbor 27 November to 9 December 1949, the submarine served there until returning under tow to Tacoma, Wash., 18 May 1953 to continue reserve training duties in that port until June 1960. She was then inactivated in preparation for disposal. Her name was stricken from the Navy List 1 May 1961. She was sold for scrapping 26 September 1961 to the National Metal and Steel Corporation, Terminal Island, Los Angeles, California
^ abcdefgBauer, K. Jack; Roberts, Stephen S. (1991). Register of Ships of the U.S. Navy, 1775-1990: Major Combatants. Westport, Connecticut: Greenwood Press. pp. 271–273. ISBN0-313-26202-0.
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