Cao Shuang
Sima Yi, along with Jiang Ji and others, led troops out of Luoyang to the floating bridge above the Luo River, where he sent a memorial to the emperor Cao Fang, listing out Cao Shuang's crimes (e.g. not fulfilling his duty as regent, corrupting the government, conspiring against the throne) and requesting the emperor to remove Cao Shuang and his brothers from their positions of power. Cao Shuang blocked the memorial from reaching Cao Fang and left the emperor at the south of the Yi River while ordering his men to cut down trees to build anti-cavalry blockades and station about 1,000 troops nearby to guard against Sima Yi's advances. During this time, Huan Fan advised Cao Shuang to bring the emperor to Xuchang, denounce Sima Yi as a traitor, and call on all military forces throughout Wei to attack Sima Yi. Cao Shuang refused to listen to Huan Fan, and that night he sent Xu Yun (許允) and Chen Tai to meet Sima Yi. Sima Yi explained to them he only wanted Cao Shuang to surrender and give up his powers. He also sent Yin Damu (尹大目), whom Cao Shuang highly trusted, to further persuade Cao Shuang to surrender. When Cao Shuang wanted to agree, Huan Fan attempted to stop him but Cao Shuang ultimately did not heed his advice. Cao Shuang said, "Sima Yi only wants to take away my powers. I can still return home as a marquis and live in luxury and comfort." Huan Fan could only sigh and thump his chest in frustration. Cao Shuang then let Cao Fang read Sima Yi's memorial and agreed to surrender and relinquish his powers.