- April 10
- Twelve Jewish patients of Herren Loo-Lozenoord escape from Germans. [1]
- British general Bernard Montgomery occupies Sfax Tunisia. [1]
- April 11
- Frank Piasecki, Vertol founder, flies his first (single-rotor) craft. [1]
- April 12
- Allies conquer Soussa, North Africa. [1]
- April 13
- Germans discover mass grave of Polish officers near Katyn. [1]
- Beginning of Warsaw ghetto uprising in Poland. [392.40]
- April 14
- Generals Alexander, Dwight Eisenhower, Anderson, Bradley discuss assault on Tunis. [1]
- April 16
- 40 New Zealand bombers attack Haarlem Netherlands (85 killed). [1]
- In Basel, Switzerland, Albert Hoffman, a Swiss chemist working at the Sandoz pharmaceutical research laboratory, accidentally consumes LSD-25, a synthetic drug. He experiences hours of unusual sensations and hallucinations. [5] [129]
- April 18
- Japanese Admiral Isoroku Yamamoto is killed when his aircraft is shot down over the Solomon Islands. [10]
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- April 19
- Alexander Schmorell, German resistance fighter, is beheaded. [1]
- A Jewish uprising in the Warsaw, Poland, ghetto results in over 50,000 deaths over several weeks. [10]
- Kurt Huber, German resistance fighter, is beheaded. [1]
- Willy Graf, German resistance fighter, is beheaded. [1]
- April 22
- German counter-attack in North Tunisia. [1]
- British Royal Air Force shoots down 14 German transport planes over Mediterranean Sea. [1]
- April 23
- British and US offensive directed at Tunis/Bizerta. [1]
- April 27
- Lou Jansen and Jan Dieters arrested, lead illegal CPN party in Holland. [1]
- Soviet Union breaks contact with Polish government exiled in London, England. [1]
- April 28
- German-Italian counter offensive in North Africa. [1]
- US 34th Division occupies Djebel el Hara North Tunisia. [1]
- April 29
- US 34th Division occupies Hill 609, North Tunisia. [1]
- April 30
- Bergen-Belsen Concentration Camp for Jews forms. [1]
- Dutch strike begins against forced labor in Germany's war industry. [1]
- May 1
- First edition of illegal "The Free Artist" appears in Amsterdam. [1]
- Food rationing begins in US. [1]
- German Wehrmacht deployed in order to break Dutch strikes. [1]
- German plane sinks boat loaded with Palestinian Jews bound for Malta. [1]
- May 2
- German troops vacate Jefna Tunisia. [1]
- May 3
- Pulitzer prize awarded to Upton Sinclair (Dragon's Teeth). [1]
- US first armour division occupies Mateur Tunisia. [1]
- May 6
- British 1st Army opens assault on Tunis, Tunisia. [1]
- May 7
- American and British forces capture Tunis and Bizerte in North Africa. 160,000 German and Italian soldiers surrender at Tunis. [10]
- Dutch men 18-35 obliged to report to labor camps. [1]
- US first Armour division occupies Ferryville Tunisia. [1]
- US 9th Infantry division occupies Bizerta/Bensert Tunisia. [1]
- May 8
- Admiral Cunningham of British fleet: "Sink, burn and destroy; let nothing pass". [1]
- Mordicai Anielewicz, commander of Warsaw ghetto uprising, is killed. [1]
- May 9
- 5th German Panser army surrenders in Tunisia. [1]
- Rotschild-Haddassh University Hospital opens. [1]
- May 10
- André Bertulot, Belgian resistance fighter, is hanged. [1]
- Arnaud/Armand Fraiteur, Belgian resistance fighter, is hanged. [1]
- Maurice-Albert Raskin, Belgian resistance fighter, is hanged. [1]
- May 11
- Hermann Goering-division in Tunisia surrenders. [1]
- US 7th division lands on Attu, Aleutian, (first US territory recaptured). [1]
- May 13
- In Tunisia in North Africa, German Afrika Korps commander General Dietloff Juergen von Arnim surrenders 275,000 troops. [10]
- German and Italian forces in Africa surrender. [1]
- May 15
- Halifax bombers sink German submarine U-463. [1]
- May 16
- German troops destroy synagogue of Warsaw. [1]
- Jewish resistance in Warsaw ghetto of Poland is crushed. [1] [392.40]
- Nine British Lancaster bombers fitted with dam-busting mines take off from Scampton, England, headed for the Möhne and Eder dams in Germany. After four unsuccessful tries, the fifth plane succeeds in breaching the Möhne dam. Six planes with three bombs head over to the Eder dam. The third hit breaches the dam 30 feet below the top. Five planes return to home base. Two more waves of bombers attack other dams, causing a small breach in the Sorpe dam. In total, 19 aircraft take off, and 11 return. 34 awards are given out. Extensive damage is done by the flooding and loss of hydroelectric power. 1000 houses are destroyed or damaged, 125 factories destroyed/damaged, 1294 people killed, 2822 hectares of farmland ruined, 6316 animals killed, 35 road bridges destroyed/damaged, etc. Germans add more defenses to other dams. Manpower is diverted from the West Wall to repair the dams. [10]
- May 18
- Allied bombers attack Pantelleria in the Mediterranean Sea. [1]
- May 19
- Berlin, Germany, is declared "Judenrien" (free of Jews). [1]
- British Prime Minister Winston Churchill pledges England's full support to US against Japan. [1]
- May 20
- French, British and US victory parade in Tunis, Tunisia. [1]
- May 22
- First jet fighter is tested. [1]
- RAF scatters first copies of "The Flying Hollander". [1]
- Stalin disbands Komintern. [1]
- May 23
- 826 Allied bombers attack Dortmund, Germany. [1]
- May 24
- Commander-in-Chief of the German Navy Karl Dönitz withdraws submarines from the North Atlantic, due to heavy losses. [10]
- German submarine U-441 shoots Sunderland seaplane down over Gulf of Biskaje. [1]
- May 25
- Trident conference in Washington DC (operation plan '43 against Japan). [1]
- May 26
- First president of a black country to visit US (Edwin Barclay, Liberia). [1]
- Jews riot against Germany in Amsterdam. [1]
- At Peenemünde, comparison tests are made of the flying bomb (Fi.103 or FZG 76, later called V-1) and the A-4 rocket (V-2) in the presence of German ministers and generals. Two rockets perform perfectly, flying 160 miles. Two flying bombs crash in the Baltic after travelling a mile or two. The Long-Range Bombardment Commission accepts the recommendation of putting both into production, top priority. [10]
- May 27
- French defiance under Jean Moulin meets secretly in Paris. [1]
- May 28
- British militia reaches Tito. [1]
- May 30
- US troops reconquer Attu Aleutians. [1]
- May 31
- "Archie" comic strip first broadcast on radio. [1]
- Japanese forces are driven from Aleutian Islands, Alaska. [392.40]
- June 2
- 99th Pursuit Squadron flies first combat mission (over Italy). [1]
- June 10
- A patent is issued in Argentina for a ball-point pen. [55.22]
- Franklin Roosevelt becomes first US president to visit a foreign country during wartime. [1]
- June 11
- (evening) 783 British bombers attack Düsseldorf, Germany. 130 acres of the city are destroyed, in 882 separate fires. 1300 people are killed, and 140,000 made homeless. [10]
- June 18
- The British "RDF" or "radiolocation" technology is renamed "radar". [10]
- June 20
- New Québec (Chubb) Crater (3.5 km diameter) discovered in northern Québec, Canada. [1]
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