진군
In mid 226, when Cao Pi became critically ill, he summoned Sima Yi, Cao Zhen, Chen Qun, and possibly Cao Xiu to meet him in the south hall of Chonghua Palace (), where he ordered them to assist his son Cao Rui after his death. Cao Pi also told Cao Rui: "There may be those who would alienate these Three Ducal Ministers from you, but be careful and do not doubt them."