The temperature on November 20, 1915 was between -2.8 °C and 3.9 °C and averaged 0.1 °C. There was 5.2 hours of sunshine (61%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-northeast. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
January 13 » The 6.7 Mw Avezzano earthquake shakes the Province of L'Aquila in Italy with a maximum Mercalli intensity of XI (Extreme), killing between 29,978–32,610.
May 24 » World War I: Italy declares war on Austria-Hungary, joining the conflict on the side of the Allies.
July 1 » Leutnant Kurt Wintgens of the then-named German Deutsches Heer's Fliegertruppe army air service achieves the first known aerial victory with a synchronized machine-gun armed fighter plane, the Fokker M.5K/MG Eindecker.
July 25 » RFC Captain Lanoe Hawker becomes the first British pursuit aviator to earn the Victoria Cross.
September 25 » World War I: The Second Battle of Champagne begins.
October 12 » World War I: British nurse Edith Cavell is executed by a German firing squad for helping Allied soldiers escape from Belgium
Day of death June 23, 1923
The temperature on June 23, 1923 was between 11.6 °C and 18.4 °C and averaged 15.1 °C. There was 3.3 hours of sunshine (20%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
In The Netherlands , there was from September 19, 1922 to August 4, 1925 the cabinet Ruys de Beerenbrouck II, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
April 15 » Insulin becomes generally available for use by people with diabetes.
May 26 » The first 24 Hours of Le Mans was held and has since been run annually in June.
June 27 » Capt. Lowell H. Smith and Lt. John P. Richter perform the first ever aerial refueling in a DH.4B biplane.
August 16 » The United Kingdom gives the name "Ross Dependency" to part of its claimed Antarctic territory and makes the Governor-General of the Dominion of New Zealand its administrator.
September 26 » The German government accepts the occupation of the Ruhr.
When copying data from this family tree, please include a reference to the origin: Berry van Osch, "Family tree Van Osch", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-van-osch/I42663.php : accessed March 12, 2026), "Marie Willem Christiaan Siebel (1915-1923)".
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