 Another Ottoman army under the leadership of Osman Pasha and Ferhat Pasha crossed into Iran and captured Tabriz in 1585.Sultan Mohammad sent Hamza Mirza to fight the Ottomans but the young prince was murdered during this campaign and the city remained in Ottoman hands for 20 years.When the Uzbeks launched a large-scale invasion of Khorasan, the leader of the Ustalju Qizilbash faction in the province, Murshid Quli Khan, decided the time was right to overthrow the shah and replace him with Mohammad's son Abbas Mirza, who was Murshid's ward.