In 1430, Murad took charge of the attack on Thessalonika, now in the possession of the Venetians, who had taken it from the Greek prince Andronicus. The activity of Venice at this time is in decided contrast to the cautious policy displayed by the republic in the previous century. For one thing, the secular contest with Genoa had been decided in favor of the Adriatic port. Then, too, the objections of the Venetians to occupy continental possessions had been overcome by the exigencies of Italian politics, which had forced Venice to play a larger rôle in advancing her especial interests than ever before. It seemed for a time as if the Venetians would become the natural heirs to the territories of the Eastern Empire in the lands of peninsular Greece, while to the north Hungary had risen to be the main power, around which the Roumanian and Slavic races gathered as their natural protector against the Turk. From now on the establishment of the Ottoman power in Europe would depend on the overthrow of both the Venetians and the Hungarians. The former, as has just been intimated, were slowly and diplomatically acquiring Greek principalities in the south of continental Greece, but were striving, at the same time, not to bear the brunt of Turkish hostility. They relied partly on the strong fleet which had been sent to the East, and partly on the care they had taken to secure the aid of the Hungarians. On the other hand, the Turks had been developing their navy, and they ventured, as early as 1428, to attack merchant vessels belonging to the republic. The fall of Thessalonika precipitated events and caused the Venetians to recognize that quick action was necessary. The republic entered into relations with the King of Cyprus and with the dissatisfied vassal princes of Karamania, who were ever ready to rebel against the Sultan. Proposals were made to King Sigismund to inaugurate a new crusade, in which he would have charge of the land forces, while the Venetians, keeping the mastery of the sea, would prevent new troops from being sent over from Asia. Unhappily, Sigismund proved apathetic; there were disturbances in the Albanian lands owned by Venice, and a war with Genoa kept the Venetians from having a free hand to deal effectively with the Sultan. Accordingly, a peace was patched up, by the terms of which Venice paid a tribute to the Turks for some of her Greek possessions.