In 394, Western Yan's emperor Murong Yong, under heavy attack by Murong Chui, sought aid from Tuoba Gui, but Tuoba Gui, while sending an army by his cousin Tuoba Qian () the Duke of Chenliu and the general Yu Yue () to distantly try to distract Later Yan, Northern Wei forces never actually engaged Later Yan, and Murong Yong was captured and killed later that year when his capital Zhangzi (長子, in modern Changzhi, Shanxi) fell, and Western Yan was annexed into Later Yan.