Battle of Grunwald

Setting the scene

The Battle of Grunwald (also called Tannenberg or Žalgiris), fought on July 15, 1410, was one of medieval Europe's largest battles and a decisive Polish-Lithuanian victory over the Teutonic Knights. The Teutonic Order, a German crusading military order, had conquered Prussia and Livonia in the 13th century and threatened Poland and Lithuania. After Poland and Lithuania united under the Union of Krewo (1385), with Lithuanian Grand Duke Jogaila becoming King Władysław II Jagiełło of Poland, conflict with the Order became inevitable over Samogitia.

What happened

In summer 1410, Jagiełło and Lithuanian Grand Duke Vytautas assembled a large army—perhaps 25,000-30,000 Poles, Lithuanians, Ruthenians, and Tatars—near Grunwald in northern Poland. The Teutonic Grand Master Ulrich von Jungingen led 15,000-20,000 knights and infantry. The battle began with a Lithuanian attack that was repulsed, and Lithuanians feigned retreat, drawing Teutonic knights forward. Polish forces then engaged, and after hours of brutal fighting, the Teutonic army was encircled and destroyed. Von Jungingen and most of the Order's leadership were killed.

Why it still matters

Grunwald broke Teutonic power permanently. Though the Order survived until 1525, it never recovered its military dominance. The battle is a national epic in Poland and Lithuania—Poland's greatest medieval victory, Lithuania's defining moment. It shifted the Baltic balance of power toward the Polish-Lithuanian union, which would dominate Eastern Europe for centuries. The battlefield is now a memorial, and the battle is commemorated annually. Grunwald demonstrated that a coalition of Eastern European states could defeat the premier military order of Christendom, ending German eastward expansion for centuries.

Background

The orders power in the Baltic waned afterward. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.