The Pope's position became worse when the council, copying the procedure of the universities, began to discuss matters, not in a general assembly, but each nation separately. This deprived John of the advantage which he hoped to gain from the numerical majority of Italian prelates attending the council. Four nations organized themselves: Italians, French, Germans, and English. Over the last three John XXIII had no hold whatever. To his disgust they treated him, not as the legitimate pope, whose authority was to be vindicated against his rivals, but as one of three schismatic popes, whose retirement was a necessary condition of the restoration of unity. When he tried to evade their demand, they brought unanswerable charges against his personal character and threatened to depose him. He tried to disarm hostility by declaring his readiness to resign if the other popes would do the same. His promise was welcomed with enthusiasm, but neither Sigismund nor his supporters were softened by it. In spite of the vehement protests of the Elector of Mainz that he would obey no pope but John XXIII, the proposal was made to proceed to a new election. John had to fall back upon his last expedient. If he departed from Constance he might throw the council into fatal confusion; at the worst he could maintain himself as an antipope, as Gregory and Benedict had done against the Council of Pisa. His ally Frederick of Tyrol was prepared to assist him. Frederick arranged a tournament outside the walls; and while this absorbed public interest, the Pope escaped from Constance in the disguise of a groom, and made his way to Schaffhausen, a strong castle of the Hapsburg Count. For the moment John XXIII seemed not unlikely to gain his end. Constance was thrown into confusion by the news of his flight. The mob rushed to pillage the papal residence. The Italian and Austrian prelates prepared to leave the city, and the council was on the verge of dissolution. But Sigismund's zeal and energy succeeded in averting such a disaster. He restored order in the city, persuaded the prelates to remain, and took prompt measures to punish his rebellious vassal. An armed force under Frederick of Hohenzollern succeeded in capturing not only John XXIII, but also Frederick of Tyrol. The latter was compelled to undergo public humiliation, and to hand over his territories to his suzerain on condition that his life should be spared. No such exercise of imperial power had been witnessed in Germany since the days of the Hohenstaufen, and Sigismund chose this auspicious moment to secure a powerful supporter within the electoral college by handing over the electorate of Brandenburg to Frederick of Nuremberg, April 30, 1415. He thus established a dynasty which was destined to play a great part in German history, and ultimately to create a new German empire.