Peace of Passau
At that time, Maurice was charged by the emperor to campaign and subdue the rebellious city of Magdeburg. When he changed sides, a peace was arranged with the citizens. Meanwhile, French troops under King Henry II marched against the Rhine to occupy the Three Bishoprics. After the allied Lutheran princes had signed the Treaty of Chambord, their forces campaigned Tyrol in the Habsburg hereditary lands and forced Charles V to flee toward the Carinthian town of Villach. In August 1552 his younger brother Archduke Ferdinand I of Austria concluded the Peace of Passau, whereby he formally accepted the Lutheran Augsburg Confession, confirmed by the emperor himself in the 1555 Peace of Augsburg.