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 12 » American Revolutionary War: In the largest defeat of the Continental Army, Charleston, South Carolina is taken by British forces.
September 23 » American Revolution: British Major John André is arrested as a spy by American soldiers exposing Benedict Arnold's change of sides.
October 16 » The Great Hurricane of 1780 finishes after its sixth day, killing between 20,000 and 24,000 residents of the Lesser Antilles.
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: H.L. Witmer, "Family tree Witmer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-witmer/I779.php : accessed January 20, 2026), "Aaltje Boer (1726-1780)".
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