위연
In 234, Zhuge Liang launched the fifth Shu invasion of Wei, with Wei Yan leading the Shu vanguard force. When Zhuge Liang became critically ill during the invasion, he gave secret orders to Yang Yi, Fei Yi and Jiang Wei to lead the army back to Shu after his death, with Wei Yan in charge of the rearguard and Jiang Wei to follow behind. If Wei Yan refused to follow the order, they were to retreat without him. When Zhuge Liang died, news of his death were kept secret. Yang Yi sent Fei Yi to meet Wei Yan and assess his intentions.