Umayyad Caliphate
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 in the so-called "Day of Thirst", Muslim hardly managed to reach Samarkand with a handful of survivors, as the Turgesh raided freely.
A string of subsequent appointees of Hisham were soundly defeated by Suluk, who in 728 took Bukhara and later on still inflicted painful defeats such as the Battle of the Defile upon the Arabs, discrediting Umayyad rule and maybe putting the foundations for the Abbasid Revolt. The Turgesh state was at its apex of glory, controlling Sogdiana, the Ferghana Valley It was only in 732, that 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 to launch a final offensive. He entered Jowzjan but was defeated by the Umayyad governor Asad at the Battle of Kharistan.
Read more about this topic: Turgesh