公孫淵
When Gongsun Yuan sent Wei Yan () for another round of talks, this time requesting he be allowed to send a hostage to the Wei court, Sima Yi dismissed the final messenger as a waste of time: "In military affairs there are five essential points. If able to fight, you must fight. If not able to fight, you must defend. If not able to defend, you must flee. The remaining two points entail only surrender or death. Now that you are not willing to come bound, you are determined to have death; there is no need of sending any hostage." Apparently, Sima Yi's previous suggestion of further negotiations was nothing more than an act of malice that gave false hope to Gongsun Yuan while prolonging the siege and placing further strain on the supplies within the city.