Gan Ning
In 207, Gan Ning was assigned to an eastern border post with the help of a sympathetic officer, Su Fei. From there he crossed over the border and defected to Sun Quan, where he found better terms of service. When Huang Zu was destroyed by Sun Quan in the following year, Gan Ning spoke in favor of Su Fei, saving his life. Gan Ning participated in several following campaigns, notably at the Battle of Yiling where he held off Cao Ren's forces long enough for reinforcements to arrive despite being outnumbered five to one. In 215, he maintained the rearguard when Sun Quan was defeated at the Battle of Xiaoyao Ford, saving his lord's life. In 217, he took a small raiding party into Cao Cao's main camp at the Battle of Ruxu and decimated the enemy forces. Gan Ning died in 220.