Later, when Sun Quan led his forces to attack Cao Pi's territories in Jing Province, some officials rejected the idea of resisting Sun Quan since Fancheng and Xiangyang lacked food supplies. At the time, Cao Ren, who was defending Xiangyang, had been reassigned from Fancheng to defend Wan. Sima Yi said: "Sun Quan has recently defeated Guan Yu. At this time, he will be thinking of defending his newly acquired territories (rather than attacking us), so he will definitely not pose a threat to us. Xiangyang's land and water routes are crucial to its defences against enemy attacks, so we cannot abandon the city." Cao Pi ignored Sima Yi's advice. As Sima Yi predicted, Sun Quan did not attack them after Cao Ren gave up on Xiangyang and Fancheng. Cao Pi regretted not listening to him.