 The envoy of Louis XIII of France, Charles de Valois, Duke of Angoulême, tried to mediate a compromise between Ferdinand and his opponents, but Ferdinand was determined to force his rebellious subjects into obedience.The united troops of Maximilian I of Bavaria, Tilly and Bucquoy invaded Bohemia and inflicted a decisive defeat on the Bohemians and their allies in the Battle of White Mountain on 8 November 1620.Maximilian I of Bavaria urged Ferdinand to adopt strict measures against the Bohemians and their allies, and Ferdinand declared Frederick V an outlaw on 29 January 1621.