Complete the following sentence: Johann Tserclaes, Count of Tilly (; ; ; February 1559 <unk> 30 April 1632) was a field marshal who commanded the Catholic League's forces in the Thirty Years' War. 1620<unk>31, he had an unmatched and demoralizing string of important victories against the Protestants, including
White Mountain, Wimpfen, Höchst, Stadtlohn and the Conquest of the Palatinate. He destroyed a Danish army at Lutter and sacked the Protestant city of Magdeburg, which caused the death of some 20,000 of the city's inhabitants, both defenders and non-combatants, out of a total population of 25,000.