Polish-Lithuanian Army Defeats Teutonic Knights at Grunwald
The Teutonic Order had long waged crusades against non-Christian neighbors and questioned the sincerity of Lithuanian Grand Duke Vytautas’s conversion after his 1386 marriage alliance with Poland. In 1409 the Order’s Grand Master Ulrich von Jungingen declared war on the Polish-Lithuanian union. An allied army of roughly 29,000 troops under King Władysław II Jagiełło and Vytautas advanced toward the Order’s capital at Marienburg. On July 15 the forces met between the villages of Grunwald and Tannenberg in northeastern Poland. After hours of combat the Teutonic heavy cavalry initially gained ground, yet Lithuanian forces returned to strike the Knights’ rear; von Jungingen was killed and most of the Order’s leadership fell or was captured.
Why it matters: The decisive Polish-Lithuanian victory ended the Teutonic Order’s expansion along the southeastern Baltic coast and triggered its long-term decline in power. Poland-Lithuania emerged as a major European state, shaping the political balance in Eastern Europe for generations and becoming a cornerstone of Polish, Lithuanian, and Belarusian national memory.
