User:Hawkeye7/War/Selected anniversaries/September 27
- 1331 - Battle of Płowce between the Kingdom of Poland and the Teutonic Order.
- 1605 - The armies of Sweden are defeated by the Polish–Lithuanian Commonwealth in the Battle of Kircholm.
- 1940 - The Tripartite Pact is signed in Berlin by Germany, Japan and Italy.
- 1941 - The SS Patrick Henry is launched, becoming the first of more than 2,700 Liberty ships.