July 15
Polish-Lithuanian Army Defeats Teutonic Knights at Grunwald
The Polish-Lithuanian victory at Grunwald broke the Teutonic Order’s eastward expansion and established the allied realms as a leading power in late medieval Europe.
Summary
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.
Context
The Teutonic Order, a German military-religious order, had carved out a sovereign state in Prussia by the fourteenth century, justifying its conquests as crusades against remaining pagan populations along the Baltic. Its knights repeatedly clashed with the Grand Duchy of Lithuania, the last major non-Christian polity in the region, over border lands and influence.
Dynastic developments altered the balance when Grand Duke Jogaila of Lithuania accepted baptism in 1386, married Poland’s Queen Jadwiga, and ascended the Polish throne as Władysław II Jagiełło. The resulting personal union between Poland and Lithuania created a formidable counterweight to the Order but also gave the Knights a pretext to question the sincerity of the Lithuanian conversion and to resume hostilities.
Border disputes and the Order’s support for anti-union factions in the region culminated in Grand Master Ulrich von Jungingen’s formal declaration of war against the Polish-Lithuanian alliance in August 1409.
What Happened
In the early summer of 1410 an allied army estimated at roughly 29,000 Polish, Lithuanian, and Ruthenian troops advanced from the south toward the Teutonic capital of Marienburg. King Władysław II Jagiełło exercised overall command while Grand Duke Vytautas directed the Lithuanian contingent. The Order’s forces, led personally by von Jungingen, moved to intercept the invaders in open country between the villages of Grunwald and Tannenberg.
The battle opened with the Teutonic heavy cavalry gaining local successes against the Polish lines. Lithuanian horsemen on the allied left were driven back, yet they soon rallied and delivered a decisive blow to the Knights’ exposed right flank and rear. In the confused fighting that followed, von Jungingen was killed and most of the Order’s senior commanders fell or were captured.
By nightfall the Teutonic army had collapsed. The victors pressed on to Marienburg but lacked the siege equipment and supplies needed to reduce its formidable defenses, forcing them to withdraw after several weeks.
Aftermath
The Order suffered irreplaceable losses of manpower and prestige; its grand master and dozens of its most experienced knights lay dead or imprisoned. The surviving leadership retreated to Marienburg, where a short-lived allied siege ended without success.
Diplomatic negotiations produced the Peace of Thorn in 1411, under which the Order agreed to substantial monetary reparations and minor territorial concessions, though its Prussian heartland remained intact for the moment.
Legacy
Grunwald signaled the long-term eclipse of the Teutonic Order as an independent military power in the Baltic. The Polish-Lithuanian union, strengthened by victory, grew into one of Europe’s largest states and later evolved into the Polish-Lithuanian Commonwealth that shaped Eastern European politics for centuries.
In national memory the battle became a cornerstone of Polish, Lithuanian, and Belarusian identity, commemorated in art, literature, and public ceremonies as a symbol of resistance to external domination and the effectiveness of Slavic-Baltic cooperation.
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.
Related Questions
Why did the Teutonic Knights go to war with Poland and Lithuania?
The Order questioned the legitimacy of the Lithuanian conversion that accompanied the 1386 union with Poland and sought to expand its territories amid ongoing border disputes.
Who commanded the opposing armies at Grunwald?
King Władysław II Jagiełło of Poland held overall command of the allied forces, with Grand Duke Vytautas leading the Lithuanians; the Teutonic Order was commanded by Grand Master Ulrich von Jungingen.
What happened during the battle itself?
After initial Teutonic gains, Lithuanian cavalry returned to attack the Knights’ rear; von Jungingen was killed and the Order’s army collapsed by the end of the day.
Did the victors capture the Teutonic capital?
No; although the Order suffered catastrophic losses, the Polish-Lithuanian army failed to take Marienburg after a brief siege.
How did Grunwald change the balance of power in Eastern Europe?
The defeat ended the Teutonic Order’s expansion and elevated Poland-Lithuania to the status of a major European power whose union would dominate the region for centuries.
Why is the battle still remembered today?
It became a foundational national myth for Poles, Lithuanians, and Belarusians, symbolizing resistance to German expansion and the strength of their historical alliance.
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US Military Atlas: Polish-Lithuanian Army Defeats Teutonic Knights at Grunwald connects to military history, war consequences, or postwar diplomacy.
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Sources
- Battle of Grunwald (1410), Encyclopædia Britannica. Accessed 2026-07-02.