and retreated towards Târgoviște. During the night of 1617 June, Vlad broke into the Ottoman camp in an attempt to capture or kill the sultan. Either the imprisonment or the death of the sultan would have caused panic among the Ottomans, which could have enabled Vlad to defeat the Ottoman army. However, the Wallachians "missed the court of the sultan himself" and attacked the tents of the viziers Mahmud Pasha and Isaac. Having failed to attack the sultan's camp, Vlad and his retainers left the Ottoman camp at dawn. Mehmed entered Târgoviște at the end of June. The town had been deserted, but the Ottomans were horrified to discover a "forest of the impaled" (thousands of stakes with the carcasses of executed people), according to Chalkokondyles. Tursun Beg recorded that the Ottomans suffered from the summer heat and thirst during the campaign. The sultan decided to retreat from Wallachia and marched towards Brăila. StephenIII of Moldavia hurried to Chilia (now Kiliya in Ukraine) to seize the important fortress where a Hungarian garrison had been placed. Vlad also departed for Chilia, but left behind a troop of 6,000 strong to try to hinder the march of the sultan's army, but the Ottomans defeated the Wallachians. Stephen of Moldavia was wounded during the siege of Chilia and returned to Moldavia before Vlad came to the fortress. The main Ottoman army left Wallachia, but Vlad's brother Radu and his Ottoman troops stayed behind in the Bărăgan Plain. Radu sent messengers to the Wallachians, reminding them that the sultan could again invade their country. Although Vlad defeated Radu and his Ottoman allies in two battles during the following months, more and more Wallachians deserted to Radu. Vlad withdrew to the Carpathian Mountains, hoping that Matthias Corvinus would help him regain his throne. However, Albert of Istenmező, the deputy of the Count of the Székelys, had recommended in mid-August that the Saxons recognize Radu. Radu also made an offer to the burghers of Brașov to confirm their commercial privileges and pay them a compensation of 15,000 ducats. Imprisonment in Hungary Matthias Corvinus came to Transylvania in November 1462. The negotiations between Corvinus and Vlad lasted for weeks, but Corvinus did not want to wage war against the Ottoman Empire. At the king's order, his Czech mercenary commander, John Jiskra of Brandýs, captured Vlad near Rucăr in Wallachia. To provide an explanation for Vlad's imprisonment to