The Battle of Grunwald, Battle of Žalgiris, or First Battle of Tannenberg, was fought on 15 July 1410 during the Polish–Lithuanian–Teutonic War. The alliance of the Crown of the Kingdom of Poland and the Grand Duchy of Lithuania, led respectively by King Władysław II Jagiełło (Jogaila), and Grand Duke Vytautas, decisively defeated the German Teutonic Order, led by Grand Master Ulrich von Jungingen. Most of the Teutonic Order's leadership were killed or taken prisoner.
Battle of Grunwald by Jan Matejko (1878)
The most important source about the battle is Cronica conflictus...
Lithuanians fighting with Teutonic knights (14th-century bas-relief from the Malbork Castle)
Teutonic Order presents Grunwald Swords as gift to King Władysław II Jagiełło (painting by Wojciech Kossak)
Polish–Lithuanian–Teutonic War
The Polish–Lithuanian–Teutonic War, also known as the Great War, occurred between 1409 and 1411 between the Teutonic Knights and the allied Kingdom of Poland and Grand Duchy of Lithuania. Inspired by the local Samogitian uprising, the war began with a Teutonic invasion of Poland in August 1409. As neither side was ready for a full-scale war, Wenceslaus IV of Bohemia brokered a nine-month truce.
Battle of Grunwald (1878)
The battle as depicted in the Berner Chronik of Diebold Schilling
Castle of Marienburg, capital of the Teutonic Knights
Peace of Thorn