March 30 » German Society of Chemistry issues an invitation to other national scientific organizations to appoint delegates to the International Committee on Atomic Weights.
April 18 » The St. Andrew's Ambulance Association is granted a royal charter by Queen Victoria.
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.
October 11 » The Second Boer War erupts in South Africa between the British-ruled Cape Colony, and the Boer-ruled Transvaal and Orange Free State.
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 May 18, 1940
The temperature on May 18, 1940 was between 8.5 °C and 19.2 °C and averaged 13.4 °C. There was 9.9 hours of sunshine (63%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from August 10, 1939 to September 3, 1940 the cabinet De Geer II, with Jonkheer mr. D.J. de Geer (CHU) as prime minister.
In The Netherlands , there was from September 3, 1940 to July 27, 1941 the cabinet Gerbrandy I, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
February 29 » In a ceremony held in Berkeley, California, physicist Ernest Lawrence receives the 1939 Nobel Prize in Physics from Sweden's Consul General in San Francisco.
June 17 » World War II: The British Army's 11th Hussars assault and take Fort Capuzzo in Libya, Africa from Italian forces.
July 10 » World War II: The Vichy government is established in France.
August 15 » An Italian submarine torpedoes and sinks the Greek cruiserElli at Tinos harbor during peacetime, marking the most serious Italian provocation prior to the outbreak of the Greco-Italian War in October.
October 21 » The first edition of the Ernest Hemingway novel For Whom the Bell Tolls is published.
October 28 » Second World War: Greece rejects Italy's ultimatum. Italy invades Greece through Albania a few hours later.
When copying data from this family tree, please include a reference to the origin: Henny Eizenga-Hendriks, "Family tree Rouwhorst", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-rouwhorst/I541.php : accessed February 6, 2026), "Hermann Rouwhorst (1899-1940)".
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