Portrait of Wallenstein by Anthony Van Dyck, 1629. Albrecht von Wallenstein was a Czech soldier and politician, who offered his services, and an army of 30,000 to 100,000 men during the Danish period (1625–29) of the Thirty Years' War (1618–48), to the Holy Roman Emperor Ferdinand II. He became the supreme commander of the armies of the Habsburg Monarchy and a major figure of the Thirty Years' War. Ultimately,Ferdinand had the general assassinated at Eger (Cheb) in Egerland.