Al-Walid I's brother and successor Sulayman () continued his predecessors' militarist policies, but expansion nonetheless mostly ground to a halt during his reign. The deaths of al-Hajjaj in 714 and Qutayba in 715 left the Arab armies in Transoxiana in disarray. For the next twenty-five years no further eastward conquests were undertaken and the Arabs lost territory. The Tang Chinese defeated the Arabs at the Battle of Aksu in 717, forcing their withdrawal to Tashkent. Meanwhile, in 716, the governor of Khurasan, Yazid ibn al-Muhallab, attempted to conquer the principalities of Jurjan and Tabaristan along the southern Caspian coast. His Khurasani and Iraqi troops were reinforced by Syrians, marking their first deployment to Khurasan, but the Arabs' initial successes were reversed by the local Iranian coalition of Farrukhan the Great. Afterward, the Arabs withdrew in return for a tributary agreement.