Tian Xu
Meanwhile, in the aftermaths of Wang's and Li Baozhen's victory over Zhu, De and Di Prefectures, which Zhu had taken over, surrendered to Wang and were incorporated into Chengde, formally under the command of Wang's son Wang Shizhen. By 790, however, Zhao Gao () the prefect of Di Prefecture had offended Wang and was refusing Wang's summons. Meanwhile, there were rumors that Li Na, whom Tian Xu's older brother Tian Chao () served under as prefect of Qi Prefecture (齊州, in modern Jinan, Shandong), was planning to escort Tian Chao back to Weibo to vie for control of Weibo Circuit. Tian Xu feared this, and, under suggestion by his staff member Sun Guangzuo (), he sent gifts to Li Na to please him and persuade him to send Tian Chao to Chang'an — and further suggested Li Na to accept Zhao's submission. Li Na therefore accepted Zhao's surrender and took Di Prefecture, despite Wang's attacks. Tian further cemented the relationship with Li Na by sending Sun to Pinglu's headquarters at Yun Prefecture (), announcing an imperial edict (which Tian Xu had forged) declaring Di Prefecture to be part of Pinglu Circuit. In anger, Wang Wujun sent his son Wang Shiqing () to attack Weibo's Bei Prefecture (貝州, in modern Xingtai, Hebei), occupying four counties of Bei Prefecture. In winter 790, Emperor Dezong, wanting to put an end to the campaigns between these circuits, ordered Li Na to return Di Prefecture to Chengde; Li Na demanded that Wang return the four counties of Bei Prefecture to Weibo first. Wang did so, and subsequently, Li Na returned Di Prefecture to Chengde.