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• SS doctors at concentration camps were given orders to select prisoners to be sent to Hartheim Castle in Austria to be euthanized. ww2dbase [Discovery of Concentration Camps and the Holocaust | CPC]
• The Germans lost several transport aircraft flying between Sicily, Italy and Tunisia, Italian North Africa. On the ground, Allied troops captured Kairouan, Tunisia. ww2dbase [Conclusion of the Desert War | CPC]
• Destroyer HMS Beverley (Lieutenant Commander R. A. Price) was torpedoed and sunk by the German submarine U-188 (Kapitänleutnant Siegfried Lüdden) while escorting Atlantic convoy ON-176. Her loss would be officially announced by the Admiralty on 2 May 1943. ww2dbase [AC]
• Adolf Hitler issued orders that the best armies, the best leaders and the best weapons were to be made available for employment in the "Encirclement of the enemy forces deployed in the Kursk area". ww2dbase [Battle of Kursk | AC]

• Alpino Bagnolini sighted an aircraft in the Atlantic Ocean at 0501 hours; she submerged to avoid detection. At 1025 hours, she sighted a periscope and turned away. ww2dbase [Alpino Bagnolini | CPC]

• 73 Zero fighters and 27 D3A carrier dive bombers attacked Oro Bay near Dobodura, Australian Papua, sinking 1 US cargo ship, sinking 1 US destroyer, damaging 1 transport, and damaging 1 Australian minesweeper. ww2dbase [Solomon Islands Campaign | Dobodura Airfield | Dobodura | CPC]

• USS Tunny was observed by a Japanese ship 40 kilometers off of Truk, Caroline Islands, but there was no subsequent attack. Early in the afternoon, she intercepted Japanese submarine I-9; she fired three forward torpedoes, and the Japanese submarines fired two; all torpedoes missed. Japanese aircraft arrived to hunt USS Tunny, but the bombs dropped caused no damage. USS Tunny would remain submerged until sundown. After dark, while on the surface, she made radar contact with a Japanese destroyer; as she moved to attack, the destroyer also detected her, attacking with nine depth charges; Tunny would remain submerged for hours to escape the attack. ww2dbase [Tunny | Truk | CPC]

• USS Snook departed Pearl Harbor, US Territory of Hawaii for her first war patrol. ww2dbase [Pearl Harbor Navy Base and Ford Island Naval Air Station | Snook | Honolulu, Oahu | CPC]
• USS Whale arrived at Pearl Harbor, US Territory of Hawaii. ww2dbase [Pearl Harbor Navy Base and Ford Island Naval Air Station | Whale | Pearl Harbor, Oahu | CPC]

• Chelmno Concentration Camp in occupied Poland ceased operations. ww2dbase [Discovery of Concentration Camps and the Holocaust | Chelmno Concentration Camp | Chelmno nad Nerem, Konin | CPC]

• USS Hoe arrived at New London, Connecticut, United States from the Portsmouth Navy Yard. ww2dbase [Hoe | New London, Connecticut | CPC]

11 Apr 1943 Interactive Map