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, decisively defeated the German–Prussian Teutonic Knights, led by Grand Master Ulrich von Jungingen.
The battle was one of the largest in Medieval Europe and is regarded as the most important victory in the histories of Poland and Lithuania, also it's widely celebrated in Belarus.
The battlefield is impresive just walking from point to point took me more than an hour and i havent seen everything
and here is the panoramic viev