Wei Yan
Wei Yan then asked Fei Yi to assist him in making arrangements for part of the Shu army to remain behind and continue with the campaign, while the rest would retreat back to Shu. Fei Yi pretended to write a letter, signed by both of them, and told Wei Yan that he would read out the letter to all the officers about the new arrangements. He also told Wei Yan: "I will go back and explain your point of view to Chief Clerk Yang. The Chief Clerk is a civil official who knows little about military affairs. He will definitely not oppose the new arrangements."