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• The Trident Conference began in Washington, DC, United States. ww2dbase [Trident Conference | CPC]
• Cruiser USS St. Louis with destroyers USS Fletcher and USS Jenkins detached from the task force and proceeded on their prong of the attack plan set for the following day. ww2dbase [St. Louis | Solomon Islands Campaign | DS]

• Just 17 months after the first conceptual meeting for an acoustic homing torpedo, the Mark 24 FIDO aerial torpedo had its first operational victory when a Liberator bomber of RAF Coastal Command’s 86 Squadron caught German submarine U-456 on the surface in the mid-Atlantic. As the submarine dove, the bomber dropped one Mark 24 torpedo that guided itself to the submerged submarine and exploded, causing major damage. Later that same day when U-456 was forced to dive deep to avoid a depth charge attack by destroyer HMS Opportune, the previous damage proved too great and the submarine sank with all 49 hands. ww2dbase [B-24 Liberator | Black May | Mark XXIV | DS]

• At his headquarters in Brisbane, Australia, George Kenney received a report noting that the morale of US 43rd Bomb Group was sharply declining. ww2dbase [George Kenney | Brisbane, Queensland | CPC]

• Modified B-25 bombers of 13th Squadron of US 38th Bomb Group, based in Port Moresby, Australian Papua, began conducting strafing missions. ww2dbase [Port Moresby | CPC]

• Japanese troops crossed the Yangtze River near Baiyang, Hunan Province, China and attacked Chinese positions on the opposite shore. ww2dbase [Battle of Exi | Baiyang, Hunan | CPC]

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

• Kamikaze departed Odomari, Karafuto Prefecture, Japan (now Korsakov, Russia) for patrols in the northern Kurile Islands area. ww2dbase [Kamikaze | Odomari, Karafuto | CPC]

• USS Wahoo attacked a convoy of two Japanese ships east of Japan; both torpedoes missed. ww2dbase [Wahoo | CPC]

• 105 survivors of the "San Marco" naval infantry regiment of Italian Navy were evacuated from La Galite Island by motored torpedo boats. ww2dbase [La Galite | CPC]

• Polish Jewish leader Samuel Zygelbojm committed suicide in London, England, United Kingdom as an expression of solidarity with the Jewish resistance fighters in Warsaw. "By my death I wish to make my final protest against the passivity with which the world is looking on and permitting the extermination of the Jewish people", he wrote in his suicide note. ww2dbase [London, England | CPC]

• Auxiliary Aircraft Carrier USS Card arrived in New York Harbor, anchoring off Tompkinsville, Staten Island, New York. ww2dbase [Card | New York Harbor, New York | DS]
• Corregidor was launched by the Kaiser Shipbuilding Company in Vancouver, Washington, United States, sponsored by Mrs. J. Hallett. ww2dbase [Corregidor | Kaiser Vancouver Shipyard | Vancouver, Washington | DS]

12 May 1943 Interactive Map