The Ottoman army entered Hungary. Fourteen fortresses sent the Sultan their keys as he approached.[115] But the forces did not advance to Vienna as their enemies expected, but turned into Styria and besieged the little town of Güns. For three weeks seven hundred brave defenders held the little fort against the might of Turkish arms, and finally made a highly honorable capitulation. After a general devastation of the country and much looting, the great army of Suleiman returned to Constantinople. Suleiman was incited to this course by the active preparations which were being made by Charles and Ferdinand to receive him at Vienna, and by the naval successes in the Mediterranean of Andrea Doria, admiral of the Italian fleet. Thus what promised to be a great duel between the two “Masters of the World” was allowed by both of them to degenerate into a plundering expedition. Affairs in Persia were in great need of Suleiman’s presence, and the capture of Koron and Patras by Doria made the Sultan more ready to listen to overtures of peace. Charles and Ferdinand took advantage of this fact to send Hieronymus von Zara and Cornelius Duplicius Schepper to the Porte in 1533. The ambassadors, after weeks of patience and adroitness succeeded in winning from the Sultan a treaty of peace, to last as long as Ferdinand should remain peaceful. Ferdinand was to retain the forts he had taken in Hungary and Zapolya to keep the others; the Emperor Charles might make peace by sending his own embassy to the Porte. As soon as Ferdinand received the news of this humiliating success, he sent word all over the kingdom, to Carniola, Croatia, Dalmatia and Slavonia that any violation of the truce would be severely punished; “denn daran ... mug der Turghisch Kaeser erkhennen dass wir den Frieden angenommen derselben zu halten gaentzlich entschlossen und so dawider gehandelt wurf, dass mit ernst zu shafen willen haben.”[116] Such were the humiliating terms of the first peace concluded by the House of Austria with the Porte (1533).