Delivered by the death of Francis in 1547, in which year Henry VIII. also died, from the watchful supervision of a jealous and powerful rival, and relieved from the fear of the Turks by a five years' truce, Charles was at liberty to bend his whole strength against the revolted princes of Germany. He marched against the Elector Frederick of Saxony, who was defeated at Mulhausen, taken prisoner, and condemned to death by a court-martial composed of Italians and Spaniards, in contempt of the laws of the empire. The sentence was communicated to the prisoner while playing at chess; his firmness was not shaken, and he tranquilly said, "I shall die without reluctance, if my death will save the honor of my family and the inheritance of my children." He then finished his game. But his wife and family could not look at his death so calmly; at their entreaty he surrendered his electorate into the emperor's hands. The other chief of the Protestant league, the Landgrave of Hesse, was also forced to submit, and detained in captivity, contrary to the pledged word of the emperor; who, fearless of any further resistance to his supreme authority, convoked a diet at Augsburg in 1548. At that assembly Maurice was invested with Saxony, and the emperor, in the vain hope of enforcing a uniformity of religious practice, published by his own authority a body of doctrine called the "Interim," to be in force till a general council should be assembled. This necessarily was unsatisfactory to both parties, but its observance was enforced by a master with whom terror was the engine of obedience.