Battle of the Baggage

The Battle of the Baggage (Arabic: ﻳﻮﻡ ﺍلاﺛﻘﺎﻝ‎‎, Yawm al-athqāl) was fought between the forces of the Umayyad Caliphate and the Turkic Turgesh tribes in September/October 737. The Umayyads under the governor of Khurasan, Asad ibn Abdallah al-Qasri, had invaded the principality of Khuttal in Transoxiana, and the local ruler called upon the Turgesh for aid. The Umayyad army retreated in haste before the Turgesh arrived, managing to cross the Oxus river just in time, while their rearguard engaged the pursuing Turgesh. The Turgesh crossed immediately after, and attacked the exposed Muslim baggage train, which had been sent ahead, and captured it. The main Umayyad army came to the rescue of the baggage train's escort, which suffered heavy casualties. The failure of the Umayyad campaign meant the complete collapse of the Arab control in the Upper Oxus valley, and opened Khurasan itself to the Turgesh.

• http://en.wikipedia.org/wiki/Battle of the Baggage