Having to face this new threat, Michael asked Emperor Rudolf to become the sovereign of Wallachia. On 25 September (5 October) Báthory issued an ultimatum demanding that Michael abandon his throne. Michael decided to attack Andrew Cardinal Báthory immediately to prevent invasion. He would later describe the events: He left Târgovişte on 2 October, and 9 by October he had reached Prejmer in southern Transylvania, where he met envoys from the city of Braşov. Sparing the city, he moved on to Cârţa where he joined forces with the Székelys.