The Battle of Grunwald, fought on July 15, 1410, was a crucial confrontation during the Polish–Lithuanian–Teutonic War. The conflict originated from the territorial ambitions of the Teutonic Knights, a medieval military order that sought to expand its influence over the lands inhabited by Slavic peoples, particularly in the territories of Poland and Lithuania. The battle was significant as it represented a united front between the Kingdom of Poland and the Grand Duchy of Lithuania, two powers which had historically been at odds but found common cause against a mutual enemy.On the battlefield near Grunwald, the Polish-Lithuanian alliance fielded a large army that included diverse troops, from heavily armored knights to lightly armed infantry. They faced off against a formidable force of the Teutonic Order led by Grand Master Ulrich von Jungingen. Utilizing clever tactics and the element of surprise, the allied forces managed to encircle and overwhelm the Teutonic Knights, resulting in significant casualties for the Order. The aftermath of the battle saw the capture of many knights and the eventual decline in Teutonic power in the region.Grunwald is celebrated not only as a military victory but also as a pivotal moment in the formation of national identity for Poland and Lithuania. This battle solidified the power dynamics in Eastern Europe and set the stage for future conflicts and alliances, reshaping the political landscape significantly.