First operational sortie by the British de Havilland Mosquito (a photo-reconnaissance mission). 3 Messerschmitt Bf109s attack but the unarmed wooden twin-engine Mosquito is able to outpace them.
German Nobel prize-winning physicist Werner Heisenberg attends a conference in German-occupied Copenhagen, Denmark. He warns his mentor Niels Bohr (a Danish Jew who is also a Nobel laureate) that Germany has an atomic weapons program. As proof, he gives Bohr a drawing of a reactor, which will end up in Allied hands and spur their development of atomic weapons.
Operation Supercharge. Australian 9th Division continues to be withdrawn from Tobruk, following Australian Government’s request that all Australian forces in the Middle East fight under one command. British cruisers HMS Ajax, Neptune & Hobart sail from Alexandria, Egypt, to Beirut, Lebanon, to embark British 70th Infantry Division to relieve Australian 9th Division. Overnight, British minelaying cruiser HMS Abdiel and destroyers HMS Jervis, Jaguar & Hasty make the round trip from Alexandria to Tobruk carrying supplies.