The Battle of Baykand was fought in 729 between the Turkic Türgesh khaganate and its Soghdian allies and the Arabs of the Umayyad Caliphate at Baykand, a town near Bukhara in Transoxiana (in modern Uzbekistan). The Arab army, under the governor of Khurasan Ashras ibn Abdallah al-Sulami, campaigned across the Oxus River to suppress a large-scale rebellion of the subject Soghdian princes that had broken out the previous year and received Türgesh support. As the Arab army advanced on Bukhara, it was encircled by the Türgesh and cut off from water.