The Battle of White Mountain (Czech: Bitva na Bílé hoře), was an early battle in the Thirty Years' War fought on 8 November 1620, in which an army of 30,000 Bohemians and mercenaries under Christian of Anhalt were defeated by 27,000 men of the combined armies of Ferdinand II, Holy Roman Emperor under Charles Bonaventure de Longueval, Count of Bucquoy and the German Catholic League under Johann Tserclaes, Count of Tilly at Bílá Hora ("White Mountain"), near Prague (now part of the city).