February 22 » War of the Austrian Succession: The Battle of Toulon causes several Royal Navy captains to be court-martialed, and the Articles of War to be amended.
July 4 » The Treaty of Lancaster, in which the Iroquois cede lands between the Allegheny Mountains and the Ohio River to the British colonies, was signed in Lancaster, Pennsylvania.
September 30 » War of the Austrian Succession: France and Spain defeat Sardinia at the Battle of Madonna dell'Olmo, but soon have to withdraw from Sardinia anyway.
Day of burial June 17, 1780
The temperature on June 17, 1780 was about 15.0 °C. There was 4 mm of rainWind direction mainly southwest. Weather type: betrokken regen. Source: KNMI
March 17 » American Revolution: George Washington grants the Continental Army a holiday "as an act of solidarity with the Irish in their fight for independence".
April 16 » Franz Friedrich Wilhelm von Fürstenberg founds the University of Münster.
May 19 » New England's Dark Day, an unusual darkening of the day sky, was observed over the New England states and parts of Canada.
June 23 » American Revolution: Battle of Springfield fought in and around Springfield, New Jersey (including Short Hills, formerly of Springfield, now of Millburn Township).
October 10 » The Great Hurricane of 1780 kills 20,000–30,000 in the Caribbean.
November 9 » American Revolutionary War: In the Battle of Fishdam Ford a force of British and Loyalist troops fail in a surprise attack against the South Carolina Patriot militia under Brigadier General Thomas Sumter.
When copying data from this family tree, please include a reference to the origin: R. Blok, "Family tree Blok", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-blok/I443.php : accessed January 26, 2026), "Hendrik Velthuijsen (1712-1780)".
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