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• USS Pompon attacked a Japanese convoy off Sakhalin island during the night, damaging a tanker and sinking transport Mikage Maru No. 20; she expended 14 torpedoes and observed 4 hits. During the attack, one of her own torpedoes circled back and nearly struck her. ww2dbase [Main Article | CPC]
• USS Puffer attacked an escorted Japanese convoy of ten freighters and tankers off the Philippine Islands, sinking tanker Teikon Maru and a freighter, and damaging another tanker; she expended 6 torpedoes and observed 5 hits. ww2dbase [Main Article | CPC]
• The Soviet minesweeper T.118 (formerly the USS Armada) was sunk by the German submarine U-365 in the Kara Sea. ww2dbase [AC]
• German submarine U-365 sank Russian freighter Marina Raskova and Soviet trawler T-114 of Soviet convoy BD-5 in western Kara Sea off northern Russia; a total of 362 were killed and 256 survived. ww2dbase [Main Article | CPC]

• USS Whale completed refitting at Pearl Harbor Navy Yard, US Territory of Hawaii. ww2dbase [Main Article | Facility | CPC]

• Irako collided with Teia Maru off Ryukyu Islands, Japan, suffering superficial damage. ww2dbase [Main Article | Tabular Record of Movement | CPC]
• The keel of landing ship No. 115 was laid down by Osaka Zosen. ww2dbase [Main Article | CPC]

• The first transport of civilians arrested in Warsaw, Poland after the start of Warsaw Uprising reached Auschwitz II-Birkenau concentration camp via Pruszków transit camp. 1,984 males and over 3,800 females were in this transport. ww2dbase [Main Article | Facility | CPC]
• German Luftwaffe wing KG 55 flew its final eastern front bombing mission as its He 111 bombers attacked bridges on the Vistula River near Warsaw, Poland. The wing would later be converted into a fighter unit under the new designation of KG(J) 55. ww2dbase [CPC]

• Joseph Kennedy, Jr., the older brother of future US President John F. Kennedy, was killed in a flying accident over East Suffolk, England, United Kingdom. ww2dbase [AC]
• No. 402 Squadron RCAF, flying Spitfire XIV fighters, began anti-V-1 flying bomb operations in Britain. The squadron was based at RAF Hawkinge in Kent, England, United Kingdom. ww2dbase [Main Article | Event | HM]

12 Aug 1944 Interactive Map