January 23 » The Malolos Constitution is inaugurated, establishing the First Philippine Republic. Emilio Aguinaldo is sworn in as its first President.
March 6 » Bayer registers "Aspirin" as a trademark.
June 12 » New Richmond tornado: The eighth deadliest tornado in U.S. history kills 117 people and injures around 200.
September 13 » Mackinder, Ollier and Brocherel make the first ascent of Batian (5,199 m - 17,058ft), the highest peak of Mount Kenya.
December 11 » Second Boer War: In the Battle of Magersfontein the Boers commanded by general Piet Cronjé inflict a defeat on the forces of the British Empire commanded by Lord Methuen trying to relieve the Siege of Kimberley.
Day of death April 5, 1943
The temperature on April 5, 1943 was between 1.9 °C and 18.2 °C and averaged 11.2 °C. There was 0.1 mm of rain. There was 10.6 hours of sunshine (80%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
February 18 » World War II: Joseph Goebbels delivers his Sportpalast speech.
March 5 » First Flight of the Gloster Meteor, Britain's first combat jet aircraft.
August 1 » World War II: Operation Tidal Wave also known as "Black Sunday", was a failed American attempt to destroy Romanian oil fields.
August 2 » The Holocaust: Jewish prisoners stage a revolt at Treblinka, one of the deadliest of Nazi death camps where approximately 900,000 persons were murdered in less than 18 months.
September 6 » Pennsylvania Railroad's premier train derails at Frankford Junction in Philadelphia, killing 79 people and injuring 117 others.
October 14 » World War II: The American Eighth Air Force loses 60 of 291 B-17 Flying Fortress during the Second Raid on Schweinfurt.
When copying data from this family tree, please include a reference to the origin: Eric Jonkers, "Family tree Jonkers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-jonkers/P69.php : accessed February 16, 2026), "Gustavus Florentinus (Staf) Jonkers (1899-1943)".
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