This is an illustration of the major battles of WWI. Shown on this image are the Battle of Tannenberg, Battle of Marne, Battle of Ypres (1st), (3rd) Battle of Ypres, Battle of Gallipoli, Battle of Verdun, Battle of the Somme, and the Battle of Caporetto.
The Battle of Grunwald (or 1st Battle of Tannenberg) took place on July 15th, 1410 with the Kingdom of Poland and the Grand Duchy of Lithuania, led by the king Jogaila (Władysław II Jagiełło), ranged against the knights of the Teutonic Order, led by the Grand Master Ulrich von Jungingen. The engagement in the Polish-Lithuanian-Teutonic War(1409-1411) was one of the most important battles in Medieval Europe, and the largest battle to involve knights.
The Battle of Grunwald, First Battle of Tannenberg or Battle of Žalgiris, was fought on 15 July 1410 during the Polish–Lithuanian–Teutonic War. The alliance of the Kingdom of Poland and the Grand Duchy of Lithuania, led respectively by King Władysław II Jagiełło (Jogaila) and Grand Duke Vytautas (Witold; Vitaŭt), decisively defeated the German–Prussian Teutonic Knights, led by Grand Master Ulrich von Jungingen. Most of the Teutonic Knights' leadership were killed or taken prisoner.