The position was hereditary and passed down through his family, eventually becoming the fully independent Tangut state of Western Xia from the 11th to 13th centuries.
In light of Tuoba Sigong's display of loyalty, Emperor Xizong made him the acting military governor of Xiasui Circuit (夏綏).
The forces under the Tang generals Tang Hongfu (唐弘夫), Cheng Zongchu (程宗楚), and Wang Chucun entered the city, but did not notify Tuoba, Li Xiaochang, or Zheng Tian the military governor of Fengxiang Circuit (鳳翔, headquartered in modern Baoji, Shaanxi).
Subsequently, Qi forces engaged those under Tuoba and Li Xiaochang at Wangqiao (王橋, in modern Xianyang, Shaanxi), defeating them.
Tuoba and Li Xiaogong then engaged Zhu and the major Qi general Shang Rang, but could not prevail, and withdrew.
[1] At some point, he also apparently seized Fuyan Circuit, an act that later was referred to by Li Keyong the military governor of Hedong (河東, headquartered in modern Taiyuan, Shanxi).