in 715, Alutar, the new king of Fergana Valley, was installed with the help of the Arabs of the Umayyad Caliphate. The deposed Ikhshid (the king of Fergana) fled to Kucha (seat of Anxi Protectorate), and sought Chinese intervention.

in 717, when Arabs were guided by the Turgesh and besieged two cities in the area of Aksu.

 In the year 750, Abu al-'Abbas al-Saffah (As-Saffah), the founder of the Abbasid Caliphate, launched a massive rebellion (known as the Abbasid Revolution) against the incumbent Umayyad Caliphate from the province of Khurasan. After his decisive victory at the Battle of the Zab and eliminating those of the Umayyad family who failed to escape to Al-Andalus, As-Saffah sent his forces to consolidate his caliphate, including Central Asia, where his forces confronted many regional powers,

https://en.wikipedia.org/wiki/Battle_of_Talas