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Between 9 December 215 and 6 January 216, Zhang Lu led his followers out of Bazhong and came to surrender to Cao Cao. Cao Cao accepted their surrender and granted marquis titles to Zhang Lu and his five sons. Around the time, Liu Bei had recently seized control of Yi Province (covering present-day Sichuan and Chongqing) from its governor Liu Zhang and occupied Bazhong after Zhang Lu left. Cao Cao ordered Zhang He to lead a force to attack Liu Bei, but Zhang He was defeated by Liu's general Zhang Fei at the Battle of Baxi.