Background
Prior to the battle, there were other indirect encounters between some of the combatants, and the military might of China had been projected beyond the harsh continental climate and the dry, desolate, and difficult terrain of the Tarim Basin, much of which consists of the Taklamakan Desert, as early as the Han Dynasty, when Emperor Wu of Han sent military expeditions to seize horses which got as far as the Ferghana. Then, in 715 when Alutar, the new king of Fergana Valley, was installed with the help of the Arabs of the Umayyad Caliphate. The deposed king Ikhshid fled to Kucha (seat of Anxi Protectorate), and sought Chinese intervention. The Chinese sent 10,000 troops under Zhang Xiaosong to Ferghana. He defeated the Arab puppet-ruler Alutar at Namangan and reinstalled Ikhshid. The inhabitants of three Sogdian cities were massacred as a result of the battle. The second encounter occurred in 717, when Arabs were guided by the Turgesh and besieged two cities in the area of Aksu. The commander of the Chinese Protectorate General to Pacify the West, Tang Jiahui, responded using two armies, one composed of Karluk mercenaries led by Ashina Xin (client qaghan of Onoq) and another composed of Tang regulars led by Jiahui himself.
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, including those of China's Tang Dynasty.
Read more about this topic: Battle Of Talas
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