Zhu then discovered that another vassal, Cui Hong () the military governor of Fengguo, was communicating with Yang. He sent Zhang Cunjing to attack Cui. Cui, in fear, sent his brother Cui Xian () as a hostage to Zhu and offered to send troops to supplement Xuanwu forces. Zhu initially agreed and recalled Zhang. When Zhu then sent Cui Xian back to Fengguo to express Zhu's order that Fengguo forces be sent to supplement Xuanwu forces, the Fengguo forces mutinied, killed Cui Xian, and forced Cui Hong to flee to Huainan. In spring 899, Zhu's forces were engaging rivals on three fronts—with Li Hanzhi recently having seized the western half of Zhaoyi after the death of Li Keyong's general Xue Jiqin (), who had been in command of Zhaoyi, Zhu sent forces to aid him; with Liu Rengong, who had taken control of both Lulong Circuit (盧龍, headquartered in modern Beijing) and Yichang Circuit (義昌, headquartered in modern Cangzhou, Hebei), attacking Weibo, Zhu sent forces to aid Weibo's military governor Luo Shaowei (Luo Hongxin's son and successor); and with Yang and Zhu Jin attacking Wuning. Yang's attack appeared to have soon dissipated, however, while Zhu's forces were successful on both the Zhaoyi and Weibo fronts, crushing Liu's forces and forcing him to stop his attack on Weibo, and stopping Li Keyong's attack on the Zhaoyi front and retaining the control of Zhaoyi. By 900, by which time Emperor Zhaozong had returned to Chang'an, and Cui Yin had lost his chancellor title due to pressure from the imperial eunuchs, whom Cui had been secretly planning with Emperor Zhaozong to slaughter, Cui again used Zhu's influence to return to the chancellorship and to force the deaths of fellow chancellor Wang Tuan (who had opposed Cui's plan of slaughtering the eunuchs) and the eunuchs Zhu Daobi () and Jing Wuxiu (). Also in 900, Zhu Quanzhong made a major incursion to the north, inflicting heavy losses against Liu Rengong, and also forcing the submission of two circuits which had been loosely allied with Li Keyong (Chengde (成德, headquartered in modern Shijiazhuang, Hebei), ruled by Wang Rong, and Yiwu (義武, headquartered in modern Baoding, Hebei), ruled at the time by Wang Gao, who fled in face of the Xuanwu attack and was replaced by his uncle Wang Chuzhi. It was said that by this point, all of the circuits north of the Yellow River