Battle of White Mountain

The Battle of White Mountain, fought on November 8, 1620 just outside Prague, was an early and decisive engagement of the Thirty Years' War. The conflict had erupted from the Bohemian Revolt of 1618, when the largely Protestant Bohemian estates rejected the Catholic Habsburg ruler and offered their crown to the Calvinist Frederick V, Elector Palatine, known as the 'Winter King.'

Johann Tserclaes, Count of Tilly, commanded the army of the Catholic League, which fought alongside imperial forces against the Bohemian and allied troops. In a battle that lasted only a few hours, the Catholic forces decisively defeated the Bohemian army outside the city. Frederick V, his brief reign over Bohemia collapsing, was forced to flee, eventually taking refuge in the Dutch Republic.

The defeat ended the Bohemian Revolt and brought severe consequences for the kingdom. The Habsburgs reasserted control, executing rebel leaders, confiscating Protestant estates, and imposing forced re-Catholicization on Bohemia. White Mountain extinguished Bohemian independence for centuries and marked the triumph of the Habsburg and Catholic cause in the war's opening phase, though the wider conflict would continue across the Holy Roman Empire until 1648.