Muslim conquest of Transoxiana

The Muslim conquest of Transoxiana or the Arab conquest of Transoxiana was the conquest of Transoxiana by the Muslim Arabs as part of the Muslim conquests.

Battles between Muslims and Turks
As a corollary to the Muslim conquest of Persia, the Muslims became neighbors of the city states of Transoxiana. Although Transoxiana was included in the loosely defined "Turkestan" region, only the ruling elite of Transoxiana was partially of Turkic origins whereas the local population was mostly a diverse mix of local Iranian populations. As the Arabs reached Transoxiana following the conquest of the Sassanid Persian Empire, local Iranian-Turkic and Arab armies clashed over the control of Transoxiana's Silk Road cities. In particular, the Turgesh under the leadership of Suluk, and Khazars under Barjik clashed with their Arab neighbours in order to control this economically important region.

Umayyad–Turgesh Wars
Suluk's aim was to reconquer all of Transoxiana from the Arab invaders - his war was paralleled, much more westwards, by the Khazar empire. In 721 Turgesh forces, led by Kül Chor, defated the Caliphal army commanded by Sa'id ibn Abdu'l-Aziz near Samarkand. Sa'id's successor, Al-Kharashi, massacred Turks and Sogdian refugees in Khujand, causing an influx of refugees towards the Turgesh. In 724 Caliph Hisham sent a new governor to Khorasan, Muslim ibn Sa'id, with orders to crush the "Turks" once and for all, but, confronted by Suluk, Muslim hardly managed to reach Samarkand with a handful of survivors after the so-called "Day of Thirst".

A string of subsequent appointees of Hisham were soundly defeated by Suluk, who in 728 took Bukhara and later on still inflicted painful tactical defeats such as the Battle of the Defile upon the Arabs. The Turgesh state was at its apex, controlling Sogdiana, and the Ferghana Valley. By 732, two powerful Arab expeditions to Samarkand managed, if with heavy losses, to reestablish Caliphal authority in the area; Suluk renounced his ambitions over Samarkand and abandoned Bukhara, withdrawing north.

In 734 an early Abbasid follower, al-Harith ibn Surayj, rose in revolt against Umayyad rule and took Balkh and Marv before defecting to the Turgesh three years later, defeated. In winter 737 Suluk, along with his allies al-Harith, Gurak (a Turco-Sogdian leader) and men from Usrushana, Tashkent and Khuttal launched a final offensive. He entered Jowzjan but was defeated by the Umayyad governor Asad at the Battle of Kharistan.

Battles between Göktürk Empire and Umayyad Caliphate
The Göktürks also had campaigns against the Arab Muslims. By 705, the Göktürks had expanded as far south as Samarkand and threatened Arab control of Transoxiana. Following Qutaiba's campaigns and Gurek's surrender, the Göktürk Empire sent forces down to the Transoxiana in order to help their Transoxian allies. According to Arab sources the forces were led by Kapagan, Bilge and Tegin. The Göktürks clashed with the Umayyad Caliphate in a series of battles (712-713) in which the Arabs again emerged as victors. The main factor of Göktürk failure was rebellions inside the empire and growing Chinese threat from the East.

Islamization
The process of islamization of local peoples was slow during the Umayyad Caliphate period, but it became more intensive during the following Abbasid period. The Umayyads treated non-Arab peoples as second class citizens and didn't encourage conversions, therefore only few Soghdian commoners converted to Islam during their rule [Grousset]. However, during the Abbasid period non-Arabs gained an equal status and as a result, Islam began spreading across Central Asia.

Aftermath
The last major victory of Muslims in Central Asia occurred at the Battle of Talas (751). Barthold states that the Islamic rule over Transoxiana was secured at the Battle of Talas. Turks had to wait two and a half more centuries before reconquering Transoxiana when the Karakhanids reconquered the city of Bukhara in 999.