“They say Zhuge Liang leaves nothing to chance,” said Meng Da, smiling as he read. “This proves it.”
He lost no time in preparing a reply, which he sent also by a trusty messenger. This letter was like this:
Zhuge Liang read the letter and threw it on the ground, stamping his foot with rage.
“Meng Da is a dead man;” said he, “a victim of Sima Yi.”
“Why do you say that?” said Ma Su.
“What does the Art of War say? 'Attack before the enemy is prepared; do what he does not expect.' What is the use of reckoning upon a month's delay for sending up a memorial? Cao Rui's commission has already gone, and Sima Yi may strike whom he will. He will not have to wait to memorialize the Throne. Ten days after he hears of Meng Da's defection, he will be upon Meng Da with an army, and Meng Da will be helpless.”'
The others agreed. However, Zhuge Liang sent the messenger back again to say that if the matter had not yet actually started, no other person was to be told of it; for if anyone knew, it would certainly come to nothing. And the man left for Xincheng.
In his idle retreat in Wancheng, Sima Yi had heard of his master's ill-success against the armies of Shu, and the news made him very sad. He lifted up his eyes and sighed.
He had two sons, Sima Shi the elder and Sima Zhao, both clever and ambitious, and both earnest students of military books. One day they were present when their father seemed very cast down, and Sima Shi asked his father the reason.
“You would not understand,” said the father.
“I think you are grieving because the Ruler of Wei does not use you,” replied Sima Shi.
“But they will send for you presently,” said Sima Zhao. The prophecy was not long in fulfillment, for even then the bearer of the command stood at the gate, and the servant announced a messenger from the court bearing a commission.
As soon as he heard its terms, Sima Yi set about ordering the armies of Wancheng. Soon came a messenger from Governor Shen Yi of Jincheng with a secret message for Sima Yi. The messenger was taken into a private chamber, and his message was that Meng Da was on the point of rebellion. The leakage of this news was due to Li Fu, a confidential subordinate of Meng Da, and Deng Xian, Meng Da's nephew. Li Fu and Deng Xian went to confess the plot in exchange for a promise of amnesty.
Sima Yi smote his forehead.
“This is the Emperor's great good fortune, high as heaven itself. Zhuge Liang's army is at Qishan already, and all people's courage is at the brink of breakdown. The Emperor must go to Changan, and if he does not use me soon, Meng Da will carry out his plan; his plot will succeed and both capitals will be lost. Meng Da is surely in league with Zhuge Liang, and if I can seize this Meng Da before he makes any move, that will damp Zhuge Liang's spirits and he will retreat.”
His elder son Sima Shi remarked, “It is necessary to memorialize the Throne.”