진군
In 198, the warlord Cao Cao, who was the "de facto" head of the Han central government, led his forces to attack Lü Bu in Xu Province and defeated him at the Battle of Xiapi, after which he took control of the province. Chen Qun and his father Chen Ji, who were both previously subordinates of Lü Bu, surrendered to Cao Cao and entered the service of the central government in the Han imperial capital, Xuchang.