Which battle in 1620 effectively ended the Bohemian phase of the war?

The Battle of White Mountain effectively ended the Bohemian phase of the Thirty Years’ War in 1620.

Fought on 8 November 1620 near Prague, the battle pitted the forces of the Habsburg Emperor Ferdinand II and the Catholic League against the Bohemian rebels and their allies. The imperial army, commanded by Johann Tserclaes, Count of Tilly, defeated the Protestant army of Frederick V, the newly elected King of Bohemia.

The defeat was rapid and decisive. Frederick fled Prague and soon became known as the “Winter King” because he ruled Bohemia for only one winter. Imperial forces then occupied Prague, while the rebellion collapsed. The Habsburg victory restored Ferdinand’s authority and began the forceful re-Catholicization of Bohemia.

The battle did not end the entire Thirty Years’ War, which continued until 1648. It ended the Bohemian Revolt and the war’s first major phase. Stadtlohn and Wimpfen were also battles of the conflict, while Lützen was a major Swedish-Imperial battle fought later, in 1632.