In the spring of 1463, Mehmed gathered an army of 150,000 men in Adrianople and prepared to march towards Bosnia. In his despair, Stephen Tomašević turned to the Sultan himself and tried at the last moment to procure a 15-year-long truce with him. Konstantinović claimed that he was present when the Ottomans duped the Bosnian envoys into thinking that the King's request for truce was granted, and that he tried to warn them about the deceit. Mehmed's army set out right after the envoys. Fortresses fell rapidly, and King Stephen fled with his family and possessions from Bobovac to Jajce. The Ottoman army under the leadership of Mahmud Pasha Angelović laid siege to Bobovac on 19 May, with the Sultan joining them the following day. Angelović was tasked with capturing the King. Believing that Bobovac could withstand the siege for two years, Stephen planned to assemble an army in Jajce, still counting on foreign aid. He sent his wife with their possessions to Dalmatia, while his stepmother took the rest to Ragusa.