Historical Events on September 21

1141 conflict within the Anarchy (civil war)

1309 treaty between Brandenburg-Stendal and the Teutonic Order

Part of the Mary, Queen of Scots civil war

1689 battle between Native Americans, and English colonials, outside the town of Falmouth (present day Portland, Maine, USA)

1706 battle of the War of the Spanish Succession

Battle in Scotland during the Jacobite rising of 1745

Friendly fire incident during the Austro–Turkish War of 1787–1791

1795 Ireland confrontation

First battle of the Hungarian War of Independence 1848

1860 battle during the Second Opium War

1959 mass murder in Nantou City, Taiwan

1997 Austrian Grand Prix — motor car race

1999 Jiji earthquake — earthquake in Chi-chi, Nantou, Taiwan

2009 Bhutan earthquake

Out of control birthday party which resulted in street riots in Haren, Netherlands, named after the 2012 Project X movie

Westgate shopping mall shooting — Terrorist attack at a shopping mall in Nairobi, Kenya on 21 September 2013

Battle between the Houthis and the Hadi-led government

Afghan teen killed by Iranian security forces during a protest in 2022