조인
Cao Ren moved to Wan (宛; present-day Wancheng District, Nanyang, Henan) in northern Jing Province and garrisoned there. Later, when Sun Quan sent Chen Shao (陳邵) to attack Xiangyang, Cao Pi ordered Cao Ren to lead an army to Xiangyang to resist Sun Quan's forces. Cao Ren and Xu Huang defeated Chen Shao and their forces entered Xiangyang. Cao Ren had the general Gao Qian (高遷) oversee the relocation of civilians from the southern bank of the Han River to the north. Cao Pi appointed Cao Ren as General-in-Chief (大將軍). Later, Cao Pi ordered Cao Ren to move to Linying (臨潁) and promoted him to Grand Marshal (大司馬). Cao Ren was placed in charge of the armies along the Wu River (烏江) and he garrisoned at Hefei. In 222, Cao Ren led several tens of thousands men to assail Sun Quan's garrison at Ruxu (濡須; north of present-day Wuwei County, Anhui), where the defending general, Zhu Huan, had only 5,000 troops remaining inside the city walls. However, Cao Ren was deemed only as an inferior commander by Zhu Huan and his colleagues, so the defenders put up a staunch defence. Even though Cao Ren had a complete numerical advantage, the battle concluded with Zhu Huan as the victor – Cao Ren lost not only over 1,000 men, but also two of his subordinates, Chang Diao (常雕) and Wang Shuang.