Gongsun Yuan
In 238, when Gongsun Yuan heard that Sima Yi was leading a Wei army to Liaodong to attack him, he sent a messenger to request reinforcements from Wei's rival state Eastern Wu. The Wu emperor, Sun Quan, eventually complied, and he wrote to Gongsun Yuan: "Sima Yi is well-versed in military arts. He uses military strategy like a god. He defeats all who stand in his way. I am deeply worried for you, my brother."