Year | Date | Historical Events |
1939 | Aug 29 | Keel laid down at the Portsmouth Naval Shipyard, Kittery, ME. |
1940 | May 21 | Launched. |
| Nov 15 | Commissioned. |
| Nov 15 | Recommissioned. |
1941 | Jul 2 | Trout and Triton (SS-201) departed New York, bound for the Pacific. |
| Aug 4 | After transiting the Panama Canal and stopping at San Diego, the submarines arrived at Pearl Harbor, HI. |
| Nov 29 | She stood out of Pearl Harbor to conduct a simulated war patrol off northern Midway. On the morning of 7 December, she received word of the Japanese attack on Pearl Harbor. |
| Dec 20 | Trout returned to Pearl Harbor, HI. |
1942 | Jan 12 | Trout stood out of Pearl Harbor with 3,500 rounds of ammunition to be delivered to the besieged American forces on Corregidor. |
| Jan 16 | Topped of with fuel at Midway Island. |
| Jan 27 | She sighted a light off her port bow, closed to 1,500 yards, and fired a torpedo which missed. She closed to 600 yards, discovered that her target was a submarine chaser. She had been warned to avoid small ships, resumed her course for the Philippines. |
| Feb 3 | Trout rendezvoused with a boat off Corregidor and was escorted to South Dock. She unloaded the ammunition; refueled; loaded two torpedoes.She was given 20 tons of gold bars and silver pesos to be evacuated from the Philippines. |
| Feb 10 | Trout entered the East China Sea. That afternoon she fired 3 torpedoes and sank the Japanese freighter Chuwa Maru. That night she sank a small 200 ton patrol ship. |
| Mar 3 | Arrived at Pearl Harbor, HI. and transferred her valuable ballast to a cruiser. |
| Mar 24 | Departed on her 4th war patrol to Japanese home waters. |
| Apr 9 | She sighted two small cargo ships. She fired two torpedoes at each target, but all missed. |
| Apr 10 | She fired one torpedo at a small steamer and missed again. |
| Apr 11 | She attacked a large freighter with two torpedoes. One hit the target but did not sink it. |
| Apr 24 | Trout hit a 10,000-ton tanker with two torpedoes off the coast of Shiono, and it headed for the beach. Fired 2 torpedoes at an escort cargo ship which hit with a tremendous explosion. When last seen, the cargo ship, too, was heading for shallow water. |
| Apr 28 | Trout attacked a 1,000-ton patrol vessel or minesweeper with a torpedo which sank it in two minutes. |
| Apr 30 | Trout attacked two ships off Shimo Misaki but missed both. |
| May 2 | Trout sank the 5,014-ton cargo ship Uzan Maru. |
| May 4 | Trout fired a spread of two torpedoes at what was thought to be a freighter. The first torpedo missed, but the second hit forward of the bridge, sinking the converted gunboat Kongosan Maru.Trout was then subjected to a six-hour depth charge attack. |
| May 17 | Trout returned to Pearl Harbor, HI. |
| May 21 | Trout stood out of Pearl Harbor as a unit of Task Group 7.1, the Midway Patrol Group which consisted of 12 submarines. Her station was south of the island as nine of the submarines were positioned fan-like to the west of Midway. |
| Jun 4 | Trout sighted a Japanese fighter plane preparing to attack from astern. She went deep and heard a series of light explosions. |
| Jun 9 | Trout passed through a large oil slick and some debris before rescuing two Japanese from a large wooden hatch cover. |
| Jun 14 | Trout returned to Pearl Harbor without firing a torpedo.
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| Aug 27 | Trout proceeded via the Marshalls to the Caroline Islands and began patrolling off Truk. |
| Aug 27 | Trout, on her 5th war patrol, proceeded via the Marshalls to the Caroline Islands and began patrolling off Truk. |
| Sep 21 | Troutfired three stern torpedoes at a naval auxiliary. The first torpedo broke the ship in half, and the next two hit the aft section. The victim was subsequently identified as Koei Maru, a converted net tender. |
| Sep 28 | Trout picked up a carrier group consisting of a light aircraft carrier, two cruisers, and two destroyers. She fired five torpedoes. She heard two timed explosions and saw the carrier Taigo (Otaka) slow, with smoke pouring out of her starboard side. |
| Oct 3 | Trout experienced a violent explosion which put both periscopes out of commission. Trout headed for Australia. |
| Oct 13 | Trout arrived at Brisbane, Australia. |
| Oct 26 | Trout's sixth war patrol took her to waters around the New Georgia Islands. |
| Nov 13 | Trout was patrolling 80 miles north of Indispensable Strait when she saw a Kongo-class battleship accompanied by destroyers and six aircraft. She fired a spread of five torpedoes with a depth setting of 25 feet. All missed and she cleared the area. |
| Nov 23 | Trout returned to Brisbane, Australia. |
| Dec 29 | Trout stood out to sea to patrol off North Borneo on her 7th war patrol. |
1943 | Jan 11 | Trout contacted a large tanker off Miri and fired three torpedoes. The first two hit the target amidships, but the third exploded prematurely. Postwar examination of Japanese records shows no sinking. The damaged ship must have limped back to port. |
| Jan 21 | Trout fired two torpedoes at a cargo ship from 700 yards and watched as the unidentified ship sank immediately. |
| Jan 29 | Trout fired three torpedoes at a destroyer and watched each run true to the target. However, all proved to be duds. |
| Feb 7 | Trout sighted tanker Misshin Maru moored off Lutong. She made a submerged approach, fired two torpedoes at the target, heard one explosion, and observed smoke rise from the stern of the tanker. However, no sinking upon this occasion was confirmed.
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| Feb 14 | Trout fired two torpedoes at what she thought to be a tanker. The first torpedo blew off the target's bow. Trout surfaced and opened fire, but soon seven of her men were wounded by enemy machine gun fire. Another torpedo sank Hirotama Maru. |
| Feb 25 | Trout arrived at Fremantle, Australia. |
| Mar 22 | On her 8th war patrol, Trout was ordered to plant mines in Api Passage. |
| Apr 4 | While en route from Balaboc Strait to Miri, fired a spread of three torpedoes at a naval auxiliary. One hit the target amidships, raising a 20 foot plume of water into the air, but the warhead did not explode.
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| Apr 7 | Trout planted 23 mines in Api Passage on 7 and 8 April and then began patrolling the Singapore trade route. |
| Apr 19 | Trout fired four torpedoes at a freighter but scored no hits. Later in the day, she fired a spread of three torpedoes at a tanker and missed. |
| Apr 23 | Trout sighted two trawlers and battle surfaced. Her deck guns soon stopped the first ship dead in the water and set it on fire. They then turned the second one into a burning wreck. |
| May 3 | Arrived at Fremantle, Australia. |
| May 27 | Departed Fremantle,Australia on her 9th war patrol and performed a special mission. |
| Jun 9 | Trout missed a transport with three torpedoes. She then landed a five-man Army team at Labangan, Mindanao. |
| Jun 15 | Troutfired a three-torpedo spread which destroyed the tanker, Sanraku Maru. |
| Jun 26 | She contacted three small coastal steamers and sank two of them with her deck guns. |
| Jul 1 | She sank Luzu Maru with four torpedoes. |
| Jul 9 | Trout picked up a party of five American officers off the south coast of Mindanao and headed for Fremantle.
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| Jul 15 | Arrived at Fremantle, Australia. |
| Aug 12 | Trout stood out to sea on her 10th war patrol to patrol the Surigao and San Bernardino straits. |
| Aug 25 | She battled a cargo-fisherman with her deck guns, then sent a boarding party on board the vessel. After they had returned to the submarine with the prize's crew, papers, charts, and other material for study by intelligence officers, she sank the vessel. |
| Sep 9 | Trout sank the Japanese submarine I-182 |
| Sep 22 | One of the remaining Japanese prisoners died of self-imposed starvation and was buried at sea.
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| Sep 23 | Sighted two ships with an escort. One was a freighter with a deck load of planes, and the other was a passenger-cargo. Trout fired a spread of three torpedoes at each of the targets. Sank the Ryotoku Maru and Yamashiro Maru. |
| Oct 4 | Arrived at Pearl Harbor, HI. The submarine was then routed back to the United States for a prolonged overhaul at the Mare Island Navy Yard. |
1944 | Jan 31 | Arrived back in Pearl Harbor from the States. |
| Feb 8 | Trout began her 11th and final war patrol. |
| Feb 16 | Trout topped off with fuel at Midway and was never heard from again. Japanese records indicate that one of their convoys was attacked by a submarine on 29 February 1944 in the area assigned to Trout. Possibly one of the convoy's escorts sank the Trout.
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| Feb 29 | Decommissioned. |
| Apr 17 | Trout was declared presumed lost.
Trout received 11 battle stars for World War II service and the Presidential Unit Citation for her second, third, and fifth patrols.
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