20 September 1854: British, French, and Ottoman alliance defeats the Russian Empire in the first major battle of the Crimean War at the Battle of the Alma
20 September 1604: The Siege of Ostend ends after Dutch and English forces surrender the city, allowing Ambrosio Spinola's Spanish army to recapture the devastated city and end one of the bloodiest sieges in history that caused an estimated 100,000 casualties
Soviet and German officials having a friendly conversation in the newly captured Polish city of Brest following the joint Nazi-Soviet invasion of Poland, 22 September 1939.
Gottfried Wilhelm Leibniz (1646-1716), German polymath active as a mathematician, philosopher, scientist and diplomat who is credited, alongside Sir Isaac Newton, with the creation of calculus in addition to many other branches of mathematics.
Members of the Dutch Resistance with troops of the United States 101st Airborne Division in Veghel in front of the Lambertus church during Operation Market Garden, September 1944.
Gallic chieftain Vercingetorix throws down his arms at the feet of Julius Caesar after the Battle of Alesia, September 52 BC. This was the last major engagement between Gauls and Romans, and is considered one of Caesar's greatest military achievements. (Painting by Lionel-Noël Royer, 1899.)