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• Weather data for 27 Apr 1943

• USS Puffer was commissioned into service with Lieutenant Commander M. J. Jensen in command. ww2dbase [Main Article | CPC]
• 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 [Main Article | CPC]
• The German Inspector of Concentration Camps ordered that only the mentally ill prisoners could be gassed via the Aktion T-4 Euthaniasia Program. ww2dbase [Main Article | 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]
• 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 [Main Article | 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 [Main Article | CPC]

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

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

27 Apr 1943 Interactive Map