Around 1459–60, Juki Mirza received aid from Abul-Khayr Khan and his wife (a daughter of Ulugh Beg), an Uzbek army under Burke Sultan was sent in his support.[2] Some of the late Ulugh Beg's troops also joined Juki Mirza.[2] Before Abu Sa'id Mirza could join his army it was defeated and Juki Mirza advanced as far as Kufin.[2] From there he invaded the Transoxiana up to Amu Darya. Abu Sa'id Mirza received intelligence of this and marched with his army out of Herat to face this threat.