The army continued for another 17 days.[32] Once the Sultan had passed Sivas and entered the lands of the Aq Qoyunlu, he sent Sarabdar Hasan Bey, the governor of the region of Amastris and Sebastea, forward to conquer a border fortress and lay waste to the lands around it. After continuing his march, the Sultan encountered Sara Khatun, mother of Uzun Hasan; she had come to negotiate a treaty of peace between the Sultan and her son.