- Apr 1 Jan Dieters, Dutch politician and resistance fighter who was the head of the Communist Party of the Netherlands, is arrested by the Nazis
- Apr 5 Mortsel, Belgium: Allies target Minerva car factory, used for repairing Luftwaffe planes for bombing raid; collateral damage from missed targets kills 936 civilians, Belgium's greatest loss of WWII
Poon Lim's 133 Day South Atlantic Odyssey
Apr 5 Chinese steward Poon Lim is found off the coast of Brazil by a Brazilian fisherman family after being adrift 133 days, after British ship SS Benlomond torpedoed by german U-boat
Conference of Interest
Apr 7 Adolf Hitler & Benito Mussolini met for an Axis conference in Salzburg
- Apr 7 British and US troops make contact at Wadi Akarit, South-Tunisia
- Apr 7 Lt colonel Claus von Stauffenberg seriously wounded at allied air raid
- Apr 7 NFL adopts free substitution rule; helmets made mandatory and 10-game schedule for all teams approved
- Apr 8 Hakuun Yasutani Roshi, founder of Sanbo Kyodan, receives dharma
- Apr 8 Stanley Cup Final, Boston Garden, Boston, MA: Detroit Red Wings beat Boston Bruins, 2-0 for a 4-0 series sweep and their 3rd SC Championship
Historic Event
Apr 8 U.S. President Franklin Roosevelt, in an attempt to check inflation, freezes wages and prices, prohibits workers from changing jobs unless the war effort would be aided thereby, and bars rate increases to common carriers and public utilities.
- Apr 8 1943 NFL Draft: Frank Sinkwich from University of Georgia first pick by Detroit Lions
- Apr 10 12 Jewish patients of Herren Loo-Lozenoord escape Nazis
- Apr 10 General Montgomery occupies Sfax, Tunisia
- Apr 11 Frank Piasecki, Vertol founder, flies his 1st (single-rotor) craft
- Apr 12 Allies conquer Soussa, North-Africa
- Apr 12 Dutch Catholic University Nijmegen closed
- Apr 13 Catholic University Nijegen closes
- Apr 13 FDR dedicates Jefferson Memorial
- Apr 13 Nazis discover mass grave of Polish officers near Katyn
Historic Event
Apr 14 Generals Alexander, Eisenhower, Anderson and Bradley discuss assault on Tunis
- Apr 14 James Gow & A d'Usseau's "Tomorrow the World" premieres in NYC
- Apr 15 Metropolitan Life Insurances issues a $225 million check to Chase
- Apr 16 40 NZ bombers attack Haarlem, Netherlands (85 killed)
- Apr 16 Swiss scientist Dr. Albert Hofmann discovers the psychedelic effects of LSD
- Apr 17 Marshal Admiral Yamamoto flies from Truk to Rabaul
- Apr 17 SS General Jürgen Stroop arrives in Warsaw
Attack on Pearl Harbor
Apr 18 Operation Vengeance: US Army Air Force P-38G fighter aircraft from Kukum Field on Guadalcanal ambush and shoot down the transport bomber aircraft of Isoroku Yamamoto, commander-in-chief of the Imperial Japanese Navy and mastermind behind the Pearl Harbor attack
- Apr 19 47th Boston Marathon won by Gerard Cote of Canada in 2:28:25.8; his 2nd of 4 wins in the event
Historic Event
Apr 19 Jews refuse to surrender the Warsaw Ghetto to SS officer Jürgen Stroop, who then orders its destruction, beginning the Warsaw Ghetto Uprising
- Apr 19 Bicycle Day - Swiss chemist Dr. Albert Hofmann deliberately takes LSD for the first time
Sports History
Apr 20 Braves manager Casey Stengel is struck by a taxi, fractures a leg
- Apr 22 German counter attack in North Tunisia
- Apr 22 RAF shoots down 14 German transport planes over Mediterranean Sea
- Apr 23 British & US offensive directed at Tunis and Bizerta
- Apr 25 The Demyansk Shield for German troops in commemoration of Demyansk Pocket instituted
- Apr 27 Soviet Union breaks contact with Polish government exiled in London
Historic Event
Apr 27 Witold Pilecki escapes from Auschwitz after having voluntarily been imprisoned there to gain information about the Holocaust
Theater Premiere
Apr 29 Noël Coward's comic play "Present Laughter" premieres in London
- Apr 29 US 34th Division occupies Hill 609, North Tunisia
- Apr 30 Bergen-Belsen Concentration Camp for Jews forms
- Apr 30 Dutch strike against forced labor in Nazi Germany's war industry
- Apr 30 Noël Coward's play "This Happy Breed" premieres in London