After the Ottoman army left Wallachia, Vlad offered Albert of Habsburg to set the burghers who had been captured at Sebeș free, but the king (who regarded them traitors) refused his offer. Vlad's attempts to maintain a balance between Hungary and the Ottomans made both the king and the sultan suspicious about his true intentions. Albert allowed a pretender to the Wallachian throne, Basarab (who was a son of Dan II) to settle in Hungary. The Ottomans strengthened the fortress of Giurgiu and sent new troops to garrison the town.