 If the Yueban would pressure them from the west, the Rouran would lose any freedom to maneuver.Though no direct records exist about the war in Dzungaria, by the course of the events, there was no peace, and the nomadic empire of Rouran began to decline.In the late 5th century the Yueban were attacked by the Tiele, who had split from the Rouran in 487.