The Umayyads under the governor of Khurasan , Asad ibn Abdallah al-Qasri , had invaded Attack the principality of Khuttal in Transoxiana , and the local ruler Control called Request upon the Türgesh for aid Assistance .

The siege lasted Process_end through the winter of 827–828 and until summer , during which time the besieging forces suffered Bodily_harm greatly from lack of food and an outbreak of an epidemic , which claimed Statement the life of their commander , Asad ibn al-Furat .