After Khalil Sultan became king of the Timurid Empire, his brother, Abu Bakr bin Miran Shah returned with his army to Azerbaijan and expelled the forces of Sultan Ahmed Jalayir from Tabriz. However, he met the forces of Kara Koyunlu under Qara Yusuf at Nakhchivan near Aras River on October 14, 1406 who was marching towards Tabriz in order to take the city. The details of the battle have not come down to us but the Timurids were severely defeated and Qara Yusuf carried the day.[citation needed]