The subsequent period in Khurasan was turbulent, revolts and anti-Umayyad agitation among the local Khurasani Arabs, necessitating the introduction of 20,000 Syrian troops into the province, additionally to the Iraqis sent in after the Battle of the Defile. Only in 739–741, after the Türgesh Khaganate collapsed following the murder of its leader Suluk, was the new governor of Khurasan, Nasr ibn Sayyar, able to largely restore the Caliphate's position in Transoxiana He extended Muslim control to Samarkand again.[48][49]