Right and Wrong. So no bonus points for you, but go on and ask the next question.

Jiang Wei, according to the novel, was tempted to kill Wei Yan but Zhuge Liang said that it was preordained and that Wei Yan was not the blame. But knowing that Wei Yan would soon defect once he died, Zhuge Liang left behind a plan in a brocade bag for his successor who's name just slips my mind (Yang something). He also gave Ma Dai secret orders on his deathbed. When Zhuge Liang eventually died and Wei Yan defected, Ma Dai asked to join him, saying he too had always held a grudge against Yang whatever. Yang-guy opened the brocade bag when Wei Yan threatened him outside city gates. He said to Wei Yan: "If you dare to shout out 'Who dares slay me?' three times, I'll give this entire region to you." Wei Yan only managed to say it once before Ma Dai struck him down from behind.