Battles & Wars › Medieval wars › The Crusades
Battle of Grunwald (Tannenberg)
July 15, 1410· Battle· Europe
Well documentedSolid records, physical evidence or scientific consensus.
Poland and Lithuania crushed the Teutonic Knights in one of medieval Europe's largest battles, killing their grand master.
See it on the Battles & Wars map →What happened
In the war of 1409–1411, Poland and Lithuania, under King Władysław II Jagiełło and his cousin Grand Duke Vytautas, invaded the Teutonic Order's state in Prussia. Near the villages of Grunwald and Tannenberg (Stębark), in today's northern Poland, they met the Order's army under Grand Master Ulrich von Jungingen. Lithuanian cavalry fell back, whether in flight or a feigned retreat, but Polish knights held. Jungingen and most of the Order's leaders were killed.
Why it matters
It broke the Teutonic Order's military power, though its fortress capital, Malbork, held out. Poland-Lithuania became eastern Europe's leading power, and the battle became a lasting Polish and Lithuanian national symbol.
How we know
The Polish chronicler Jan Długosz, whose father fought there; the 'Cronica conflictus', a near-contemporary account; the Order's letters and records; and battlefield archaeology since the 1950s.
Still debated
Army sizes, perhaps 15,000–40,000 a side, are estimates that vary widely. Whether the Lithuanian withdrawal was a planned feint or a real rout remains debated.
Connections (4)
▸Battle of Grunwald (Tannenberg) crippled the Teutonic Order, heirs of The CrusadesWell documented
The connection
The Teutonic Order was founded at Acre in 1190 during the Third Crusade, then moved to the Baltic, where it crusaded against pagan Prussians and Lithuanians and built its own state. Lithuania's conversion in 1387 had already weakened its purpose. Grunwald killed its grand master and much of its leadership, and the Order never fully recovered.
When and how
Order founded at Acre, 1190; Baltic crusades from the 1230s; Grunwald, Prussia (now northern Poland), July 15, 1410.
How we know
The Order's own records and papal documents trace its line from the Holy Land to Prussia; both sides recorded its losses at Grunwald.
Debates and open questions
Historians debate whether the Order's decline came mainly from the battle or from the war debts, heavy taxes and Prussian revolt that followed.
▸Battle of Grunwald (Tannenberg) was among the largest clashes of Stirrup and heavy cavalry (knights)Well documented
The connection
Grunwald was one of the largest battles of medieval Europe, fought mostly by mounted knights and men-at-arms with lances and swords, plus lighter, steppe-style Lithuanian and Tatar cavalry. It showed knightly warfare at full scale just before guns and disciplined infantry began to dominate.
When and how
Fields near Grunwald and Stębark, Prussia, July 15, 1410: Polish, Lithuanian, Ruthenian and Tatar horsemen against the Teutonic knights and volunteers from across Europe.
How we know
Chronicles, especially Długosz, describe the cavalry fighting in detail, and banner lists record units. Both sides brought a few cannon, which played almost no part.
Debates and open questions
Exact numbers are unknown, so 'largest' depends on estimates. How the Lithuanian cavalry's withdrawal fit into the knightly fight is still argued.
▸Battle of Grunwald (Tannenberg) was echoed by name at Tannenberg in World War IWell documented
The connection
In August 1914 a German army encircled a Russian army in East Prussia, not far from the 1410 field. The German command named the victory Tannenberg, the German name for the medieval site, presenting it as revenge for the Teutonic defeat. Poles and Lithuanians had long celebrated Grunwald as a national triumph.
When and how
East Prussia, August 26–30, 1914; Hindenburg and Erich Ludendorff against Russian General Alexander Samsonov's Second Army.
How we know
Ludendorff's memoirs and German wartime propaganda make the naming explicit, and the Tannenberg Memorial, opened in 1927, stressed the link.
Debates and open questions
Who proposed the name, Ludendorff, staff officer Max Hoffmann or Hindenburg, is disputed. The fighting centered miles from Tannenberg itself, so the link is symbolic, not causal.
▸Battle of Grunwald (Tannenberg) was fought by knights in early Plate armorWell documented
The connection
In 1410 knights wore a transitional mix: plate on arms and legs, a breastplate or coat of plates, often still with mail beneath, and a bascinet helmet. Full plate was just emerging. The wealthy Teutonic knights and Polish nobles were among the best-armored men in Europe.
When and how
Grunwald, July 15, 1410; Teutonic knights, Polish nobles and foreign volunteers from Germany, Bohemia and elsewhere.
How we know
Tomb effigies, brasses and surviving armor from around 1400, plus finds from the Grunwald battlefield, show the armor of the period.
Debates and open questions
Exactly what each side wore is uncertain, as little armor from the battle survives, and the share of lightly armored Lithuanians is unknown.