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During the Chuping era (190–193) in the reign of Emperor Xian of the Eastern Han dynasty, Li Qian and Li Dian led their followers to assist the warlord Cao Cao in suppressing the Yellow Turban Rebellion and they defeated the rebels at Shouzhang County (壽張縣; south of present-day Dongping County, Shandong). Li Dian and his uncle later followed Cao Cao in his campaigns against rival warlords such as Yuan Shu and Tao Qian. When conflict broke out between Cao Cao and Lü Bu in 194, Cao sent Li Qian back to Chengshi County to reaffirm the support of the locals towards him. Lü Bu's subordinates Xue Lan () and Li Feng () tried to persuade Li Qian to defect to their side but Li Qian refused so they killed him. Cao Cao then gave command of Li Qian's troops to Li Qian's son, Li Zheng (), and sent some of his men to assist Li Zheng to attack Xue Lan and Li Feng. Li Zheng achieved victory over Xue Lan and Li Feng, and later helped to pacify the various counties in Yan Province. He was appointed as the Inspector () of Qing Province.