Southern Liang
In 408, noticing that Southern Liang was under severe attack by its neighbors (including having suffered a terrible defeat to Xia in 407), Yao Xing launched a campaign to try to destroy Southern Liang, despite opposition by his official Wei Zong (韋宗), who felt that Tufa Rutan would not be defeated easily. He commissioned his son Yao Bi (姚弼) the Duke of Guangping along with Qifu Gangui and Lian Cheng (斂成) to attack Southern Liang, while simultaneously commission Qi Nan (齊難) to attack Xia. Both ventures ended badly. Yao Bi and later Yao Xian (姚顯) the Duke of Changshan were defeated by Tufa Rutan, and Yao Xing was forced to agree to a new peace with Southern Liang while having lost prestige based on the defeat. Even more disastrous was the Qi's mission, however, as Qi fell into a trap laid by Liu Bobo and was captured with his entire army, causing all of modern northern Shaanxi to fall into Xia hands. Later in 408, Tufa Rutan effectively repudiated his vassal status by again claiming the title King of Liang (instead of the Later Qin-created title of Duke of Guangwu) and changing era name.