 Before his death, Zhuge Liang gave secret orders to Yang Yi, Fei Yi, and Jiang Wei to lead the Shu army on a retreat 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 was kept secret.