September 23: Celebrate Bisexuality DayBenedict Arnold1780 American Revolutionary War: British officer John Andr was captured by Patriot forces, thereby revealing a plot by Continental Army general Benedict Arnold (pictured) to hand over West Point, New York.1913 The United Mine Workers of America begin a strike against the Rockefeller-owned Colorado Fuel & Iron Company, sparking the Colorado Coalfield War.2002 The first version of the web browser Firefox was released by the Mozilla Organization.2008 A gunman shot and killed ten students at the Seinjoki University of Applied Sciences in Kauhajoki, Finland, before committing suicide.2019 The British travel company Thomas Cook Group ceased operations with immediate effect, leaving around 600,000 tourists stranded around the world.John Ainsworth Horrocks (d.1846)Ellen Hayes (b.1851)Sigmund Freud (d.1939)Sean Spicer (b.1971)More anniversaries: September 22September 23September 24ArchiveBy emailList of days of the yearAbout