Man Chong
In 231, the Wu emperor Sun Quan led an army to attack Xincheng. Man Chong wrote to the Wei emperor Cao Rui to summon soldiers from Yan and Yu provinces to help defend Xincheng. Shortly after the troops arrived, Sun Quan retreated without attacking Xincheng. One of Cao Rui's advisers, Xu Xuan, warned that this was their plan all along and that as soon as the troops were dispersed, Sun Quan would attack again. After about ten days, Sun Quan returned to besiege Xincheng but Man Chong was fully prepared and easily repelled the assault.