Thirty Years' War: Forces of the Holy Roman Empire and Electorate of Saxony are defeated by the Swedes at the Battle of Chemnitz, ending the military effectiveness of the Saxon army for the rest of the war and allowing the Swedes to advance into Bohemia.

The Thirty Years' War, fought primarily in Central Europe between 1618 and 1648, was one of the most destructive conflicts in European history. An estimated 4.5 to 8 million soldiers and civilians died from the effects of battle, famine, or disease, with parts of Germany reporting population…