Sima Yi returned to his tent and assembled his officers. Hauling out the grumbler, Sima Yi said to him, angrily, “The state feeds and trains soldiers a thousand days for one hour's service. How dare you give vent to your spleen to the detriment of discipline?”
The man would not confess, so his comrades were called to bear witness. Still he would not own up.
“I am not here for a wager, but to overcome Shu,” said Sima Yi. “Now you all have done well and are going home, but only this fellow complains and is guilty of mutinous conduct.”
Sima Yi ordered the lictors to put him to death, and in a short time they produced his head.
The others were terrified, but Sima Yi said, “All you must do your utmost to guard against the enemy. When you hear a bomb explode, rush out on all sides and attack.”
With this order they retired.
Now Wei Yan, Zhang Ni, Chen Shi, and Du Qiong, with twenty thousand troops, entered the Chi Valley. As they were marching, Adviser Deng Zhi came.
“I bear an order from the Prime Minister. As you go out of the valley, beware of the enemy,” said Deng Zhi.
Chen Shi said, “Why is the Prime Minister so full of doubts? We know the soldiers of Wei have suffered severely from the rain and must hasten home. They will not lay any ambush. We are doing double marches and shall gain a great victory. Why are we to delay?”
Deng Zhi replied, “You know the Prime Minister's plans always succeed. How dare you disobey his orders?”
Chen Shi smiled, saying, “If he was really so resourceful, we should not have lost Jieting.”
Wei Yan, recalling that Zhuge Liang had rejected his plan, also laughed, and said, “If he had listened to me and gone out through Ziwu Valley, not only Changan but Luoyang too would be ours. Now he is bent on taking Qishan; what is the good of it? He gave us the order to advance and now he stops us. Truly the orders are confusing.”
Then said Chen Shi, “I will tell you what I will do. I shall take only five thousand troops, get through the Chi Valley, and camp at Qishan. Then you will see how ashamed the Prime Minister will look.” Deng Zhi argued and persuaded, but to no avail; the willful leader hurried on to get out of the valley. Deng Zhi could only return as quickly as possible and report.
Chen Shi proceeded. He had gone a few miles when he heard a bomb, and he was in an ambush. He tried to withdraw, but the valley was full of the enemy and he was surrounded as in an iron cask. All his efforts to get out failed. Then there was a shout, and Wei Yan came to the rescue. Wei Yan saved his comrade, but Chen Shi's five thousand troops was reduced to about five hundred, and these wounded. The Wei soldiers pursued, but two other divisions of Zhang Ni and Du Qiong prevented the pursuit, and finally the army of Wei retired.
Chen Shi and Wei Yan who had criticized Zhuge Liang's powers of prevision no longer doubted that he saw very clearly. They regretted their own shortsightedness.
When Deng Zhi told his chief of the bad behavior of Chen Shi and Wei Yan, Zhuge Liang only laughed.
Said he, “That fellow Wei Yan has never been quite true; he has always been disposed to disobey and is unsteady. However, he is valiant, and so I have saved him for our use, but he will do real harm some day.”
Then came a messenger with news of Chen Shi's defeat and loss of troops. Zhuge Liang sent Deng Zhi back again to Chi Valley to console with Chen Shi and so keep him from actual mutiny.
Then Zhuge Liang called to his tent Ma Dai and Wang Ping, and said, “If there are any troops of Wei in the Xie Valley, you are to go across the mountains, marching by night and concealing yourselves by day, and make for the east of Qishan. When you arrive, make a fire as a signal.”
Ma Zhong and Zhang Ni were told to go in similar fashion to the west of Qishan and join up with the other two. Then they were to make a joint attack on Cao Zhen's camp. Zhuge Liang would also attack in the center. Guan Xing and Liao Hua also received secret orders.
The armies marched rapidly. Not long after starting, two other detachments led by Wu Ban and Wu Yi received secret orders and left the main body.
The doubts about the coming of the Shu army made Cao Zhen careless, and he allowed his soldiers to become slack and rest. He only thought of getting through the allotted ten days, when he would have the laugh against his colleague.
Seven of the days had passed, when a scout reported a few odd men of Shu in the valley. Cao Zhen sent Qin Liang with five thousand troops to reconnoiter and keep them at a distance. Qin Liang he led his troops to the entrance of the valley. As soon as he arrived, the enemy retired. Qin Liang went after them, but they had disappeared. He was perplexed and puzzled, and while trying to decide, he told the troops to dismount and rest.
But almost immediately he heard a shout, and ambushing troops appeared in front of him. He jumped on his horse to look about him, and saw a great cloud of dust rising among the hills. He disposed his troops for defense, but the shouting quickly came nearer, and then Wu Ban and Wu Yi appeared advancing towards him. Retreat was impossible for Guan Xing and Liao Hua had blocked the road. The hills were on both sides, and from the hill-tops came shouts of “Dismount and yield!”
More than half did surrender. Qin Liang rode out to fight, but he was slain by Liao Hua.
Zhuge Liang put the Wei soldiers who had come over to his side in one of the rear divisions. With their dress and arms, he disguised five thousand of his own troops so that they looked like his enemies, and then he sent this division — under Guan Xing, Liao Hua, Wu Yi, and Wu Ban — to raid Cao Zhen's camp. Before they reached the camp, they sent one of their number ahead as a galloper to tell Cao Zhen that there had been only a few men of Shu and they had all been chased out of sight, and so lull him into security.
This news satisfied Cao Zhen. But just then a trusty messenger from Sima Yi came with a message: “Our troops have fallen into an ambush, and many have been killed. Do not think any more about the wager: that is canceled. But take most careful precautions.”
“But there is not a single soldier of Shu near,” said Cao Zhen.
He told the messenger to go back. Just then they told him Qin Liang's army had returned, and he went out to meet them. Just as he got near, someone remarked that some torches had flared up in the rear of his camp. He hastened thither to see. As soon as he was out of sight, the four leaders waved on their troops and dashed up to the camp. At the same time Ma Dai and Wang Ping came up behind, and Ma Zhong and Zhang Yi came out.
The soldiers of Wei were trapped and helpless; they scattered and fled for life. Cao Zhen, protected by his generals, fled away to the eastward. The enemy chased them closely. As Cao Zhen fled there arose a great shouting, and up came an army at full speed. Cao Zhen thought all was lost, and his heart sank, but it was Sima Yi, who drove off the pursuers.
Though Cao Zhen was saved, he was almost too ashamed to show his face.
Then said Sima Yi, “Zhuge Liang has seized Qishan, and we cannot remain here; let us go to River Wei, whence we may try to recover our lost ground.”
“How did you know I was in danger of defeat?” asked Cao Zhen.
“My messenger told me that you said there was not a single soldier of Shu near, and I knew Zhuge Liang would try to seize your camp. So I came to your help. The enemy's plan succeeded, but we will say no more about that wager. We must both do our best for the country.”
But the fright and excitement made Cao Zhen ill, and he took to his bed. And while the army were in such a state of disorder, Sima Yi was afraid to advise a return. They camped at River Wei.