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• The German Inspector of Concentration Camps ordered that only the mentally ill prisoners could be gassed via the Aktion T-4 Euthaniasia Program. ww2dbase [Discovery of Concentration Camps and the Holocaust | CPC]
• Radar jamming devices began operations in eastern England, United Kingdom. ww2dbase [CPC]
• Captain Lord Charles Lyell was killed in Tunisia whilst knocking out a 88mm gun position and two machine gun posts. He was posthumously awarded the Victoria Cross. ww2dbase [AC]
• USS Scorpion fired six torpedoes at a Japanese convoy, sinking the merchant ship Yuzan Maru with four hits; she was depth charged by an escorting destroying and suffered minor damage. ww2dbase [Scorpion | CPC]
• Admiral Dönitz issued a new order to his submarine commanders, instructing that they were to cross the Bay of Biscay submerged during the night and to resurface during the day only long enough to recharge their batteries. This proved something of a mistake for the Germans as it permitted some 12 RAF Squadrons to contribute to daylight anti-submarine operations. ww2dbase [Black May | AC]
• Orde Wingate and his small group of Chindits reached the Chindwin River in Burma. They were able to cross it later in the day with the help of Gurkha Rifles men from the western bank of the river. ww2dbase [Operation Longcloth | CPC]
• USS Puffer was commissioned into service with Lieutenant Commander M. J. Jensen in command. ww2dbase [Puffer | CPC]

• Submarine USS Narwhal arrived at Dutch Harbor, Alaska. ww2dbase [Narwhal | Dutch Harbor, Aleutian Islands | DS]

• George Kenney departed Port Moresby, Australian Papua for Brisbane, Australia. ww2dbase [George Kenney | Port Moresby | CPC]

• German submarine U-518 arrived at Lorient, France and disembarked three prisoners captured from Swedish motor merchant Industria, which U-518 had sunk on 25 Mar 1943. The prisoners were later repatriated by aircraft to Sweden. ww2dbase [Lorient, Bretagne | HM]

• The keel of U-1133 was laid down at the Howaldtswerke shipyard in Kiel, Germany. ww2dbase [U-1133 | Howaldtswerke Kiel | Kiel, Schleswig-Holstein | CPC]

• Jaguar, Greif, and Z4 Richard Beitzen escorted light cruiser Nürnberg out of Harstad, Norway toward Kiel, Germany. ww2dbase [Nürnberg | Z4 Richard Beitzen | Greif | Jaguar | Harstad | CPC]

• The 17,526-ton Japanese troop carrier Kamakura Maru departed Manila, Philippines with 2,500 oil production workers and army medical personnel, heavy vehicles, and ammunition on board, bound for Balikpapan, Borneo, Dutch East Indies. ww2dbase [Manila | HM]

• Peter Drummond was made the Air Member for Training of the British Air Council. ww2dbase [Peter Drummond | England | CPC]

• USS Tunny departed Midway Atoll for Pearl Harbor, US Territory of Hawaii. ww2dbase [Tunny | Midway Bases | Midway | CPC]

27 Apr 1943 Interactive Map