Wei Guan
Tian Xu had initially served under Deng Ai during the campaign against Shu. During an earlier battle at Jiangyou, Deng Ai wanted to execute Tian Xu for delaying his advance against the enemy, but spared him eventually. When Wei Guan sent Tian Xu to attack Deng Ai, he told Tian, "You can now take revenge against Deng Ai for how he humiliated you at Jiangyou."