The Battle of Grunwald was the first battle of the Teutonic War (1409-1411). It took place on July 15, 1410 with king Jogaila (Władysław II Jagiełło) leading the alliance of Kingdom of Poland and Grand Duchy of Lithuania against the Teutonic Order and crusaiding knights from Western Europe who were led by the Grand Master Ulrich von Jungingen. The battle was one of the most important battles in Medieval Europe, and the largest battle to involve knights.
The forces of the Monastic State of the Teutonic Knights were decisively defeated in the battle and the Order has never been able to recovered its former power. This battle also ended Northern Crusades around the southern and eastern shores of the Baltic Sea.