〃You know;〃 said Zhuge Liang; smiling。 〃Those dark clouds and the strong north wind mean snow。 Then I can do what I wish。〃
The two leaders; Guan Xing and Zhang Bao; were sent into ambush; and Jiang Wei went out to offer battle。 But he was to retire before the iron chariots。 At the entrance to the camp were displayed many flags; but the soldiers that should serve under them were not there。
It was now full winter; the twelfth month; and the snow had e。 The army of Shu went out to offer battle。 When the iron chariots came forward; they retired and thus led the Qiangs to the gate of the camp; Jiang Wei going to its rear。 The Qiangs came to the gate and stopped to look。 They heard the strumming of a lute; but there were no soldiers there; the flags meant nothing。 They told Yue Ji; and he suspected some ruse。 Instead of entering; he went back to Prime Minister Ya Dan and told him。
〃It is a ruse;〃 said Ya Dan。 〃Zhuge Liangs base trick is the pretense of a pretense; and you had better attack。〃
So Yue Ji led his troops again to the camp gate; and there he saw Zhuge Liang with a lute just getting into his chariot。 With a small escort; he went toward the back of the camp。 The tribesmen rushed into the camp and caught sight of the light chariot again just as it disappeared into a wood。
Then said Ya Dan; 〃There may be an ambush; but I think we need not be afraid of these soldiers。〃
Hence they decided to pursue。 Ahead of them they saw the division under Jiang Wei hastening off through the snow。 Yue Jis rage boiled up at this sight; and he urged his men to go faster。 The snow had filled in the roads among the hills; making every part look like a level plain。
As they marched; one reported that some of the enemy were appearing from the rear of the hills。 Some thought this meant an ambush; but Ya Dan said it did not matter; and they need not fear。 He urged them to hasten。
Shortly after this they heard a roaring as if the hills were rending asunder and the earth falling in; and the pursuers on foot fell one atop of the other into great pits that were invisible in the snow。 The iron chariots; being close behind and hurrying along; could not stop; and they went into the pits also。 Those still farther in the rear halted; but just as they were facing about; Guan Xing and Zhang Bao came up; one on either side; and attacked。 Myriads of bolts flew through the air。 Then three other divisions under Jiang Wei; Ma Dai; and Zhang Yi arrived and confusion was worse than ever。
The Qiang leader; Yue Ji; fled to the rear and was making for the mountains when he met Guan Xing; who slew him in the first encounter。 Prime Minister Ya Dan was captured by Ma Dai and taken to the main camp。 The soldiers scattered。
Hearing of the capture of one leader; Zhuge Liang took his seat in his tent and bade them bring the prisoner。 He told the guards to loose his bonds; and he had wine brought to refresh him and soothed him with kindly words。
Ya Dan was grateful for this kindness; and felt more so when Zhuge Liang said; 〃My master; the Emperor of the Great Han; sent me to destroy those who are in revolt。 Why are you helping them? But I will release you; and you will return to your master and say that we are neighbors and we will swear an oath of everlasting friendship; and tell him to listen no more to the words of those rebels。〃
Ya Dan was released and so were all the soldiers that had been captured; and all their stuff was given back to them。 They left for their own country。
The Qiangs being thus disposed of; Zhuge Liang quickly marched again to Qishan。 He sent letters to Capital Chengdu announcing his success。
Meanwhile Cao Zhen anxiously waited for news of his expected allies。 Then a scout came in with the news that the army of Shu had broken camp and were marching away。
〃That is because the Qiangs have attacked;〃 said Guo Huai gleefully; and the two made ready to pursue。
They saw ahead of them the army of Shu seemed to be in confusion。 The Van Leader Cao Zun led the pursuit。
Suddenly; as he pressed on; there came a roll of drums; followed by the appearance of a cohort led by Wei Yan; who cried; 〃Stop! You rebels!〃
But Cao Zun did not obey the summons。 He dashed forward to meet the attack。 He was killed in the third encounter。 His colleague Zhu Zan in similar fashion fell in with a cohort under Zhao Yun; to whose long spear he soon fell victim。 The loss of these two made Cao Zhen and Guo Huai hesitate; and they made to retire。
But before they could face about; they heard the drums of an army in their rear; and Guan Xing and Zhang Bao came out and surrounded them。 Cao Zhen and Guo Huai made a stand for a time; but were soon worsted and fled。 The army of Shu pursued the beaten enemy to the bank of River Wei; where they took possession of the Wei camp。
Cao Zhen was greatly chagrined at his defeat and sad at the loss of his generals。 He send a report of his misfortune to his master and asked for reinforcements。
At the court of Wei one of the ministers told the story; saying; 〃Cao Zhen has been defeated repeatedly; and his two Van Leaders were slain。 Further; his Qiang allies have suffered great loss。 Cao Zhen is sending for help; and the case is very urgent。〃
Cao Rui was alarmed and asked for someone to say how to drive off the victorious foe。
Thereupon Hua Xin said; 〃It will be necessary for Your Majesty to go in person。 You should call together all the nobles; and each will have to exert himself。 Unless this is done; Capital Changan will be lost and the whole Land Within the Passes be in danger。〃
But Imperial Guardian Zhong Yao opposed him。
Said he; 〃The knowledge of every leader must exceed that of those led; then only will he be able to control them。 Sun Zi the Strategist sums it up very briefly: Know the enemy; know thyself; and every battle is a victory。 I know Cao Zhen has had great experience in the field; but he is n