Ruler of Wei； he received a mand in Cao Rui's own writing：
〃When you； Noble Sir； reach the banks of River Wei and have well fortified that position； you are not to give battle。 The army of Shu； disappointed of their desire； will pretend to retire and so entice you on； but you will not pursue。 You will wait till their supplies are consumed and they are pelled to retreat； when you may smite them。 Then you will obtain the victory without distressing the army unduly。 This is the best plan of campaign。〃
Sima Yi took it with bowed head。 He proceeded forthwith to Changan。 When he had mustered the forces assembled from all western counties； they numbered four hundred thousand； and they were all camped on River Wei。 In addition； fifty thousand troops were farther up the stream preparing nine floating bridges。 The two Leaders of the Van； Xiahou Ba and Xiahou Wei； were ordered to cross the river and camp； and in rear of the main camp on the east a solid earth rampart was raised to guard against any surprises from the rear。
While these preparations were in progress； Guo Huai and Sun Li came to the new camp。
Guo Huai said； 〃With the troops of Shu at Qishan； there is a possibility of their dominating River Wei； going up on the plain； and pushing out a line to the northern hills whereby to cut off all highways in the West Valley Land。〃
〃You say well；〃 said Sima Yi。 〃See to it。 Take mand of all the West Valley Land forces； occupy Beiyuan； and make a fortified camp there。 But adopt a defensive policy。 Wait till the enemy's food supplies get exhausted before you think of attack。〃
So Guo Huai and Sun Li left to carry out these orders。
Meanwhile Zhuge Liang made five main camps at Qishan； and between Xie Valley and Saber Pass he established a line of fourteen large camps。 He distributed the troops among these camps as for a long campaign。 He appointed inspecting officers to make daily visits to see that all was in readiness。
When he heard that the army of Wei had camped in Beiyuan； he said to his officers； 〃They camp there fearing that our holding this area will sever connection with West Valley Land。 I am pretending to look toward Beiyuan； but really my objective is River Wei。 I am going to build a hundred or more large rafts and pile them with straw； and I have five thousand of marines to manage them。 In the darkness of the night I shall attack Beiyuan。 Sima Yi will e to the rescue。 If he is only a little worsted； I shall cross the river with the rear divisions； then the leading divisions will embark on the rafts； drop down the river； set fire to the floating bridges； and attack the rear of the enemy。 I shall lead an army to take the gates of the first camp。 If we can get the south bank of the river； the campaign will bee simple。〃
Then the generals took orders and went to prepare。
The spies carried information of the doings of the troops of Shu to Sima Yi； who said to his generals； 〃Zhuge Liang has some crafty scheme； but I think I know it。 He proposes to make a show of taking Beiyuan； and then； dropping down the river； he will try to burn our bridges； throw our rear into confusion； and then attack our camps。〃
So he gave Xiahou Ba and Xiahou Wei orders： 〃You are to listen for the sounds of battle about Beiyuan。 If you hear the shouting； you are to march down to the river； to the hills on the south； and lay an ambush against the troops of Shu as they arrive。〃
Zhang Hu and Yue Chen were to lead two other forces； of two thousand of bowmen each； and lie in hiding on the north bank near the bridges to keep off the rafts that might e down on the current and keep them from touching the bridges。
Then he sent for Guo Huai and Sun Li； and said； 〃Zhuge Liang is ing to Beiyuan to cross the river secretly。 Your new force is small； and you can hide half way along the road。 If the enemy cross the river in the afternoon； that will mean an attack on us in the evening。 Then you are to simulate defeat and run。 They will pursue。 You can shoot with all your energy； and our marines and land troops will attack at once。 If the attack is in great force； look out for orders。〃
All these orders given； Sima Yi sent his two sons Sima Shi and Sima Zhao to reinforce the front camp； while he led his own army to relieve Beiyuan。
Zhuge Liang sent Wei Yan and Ma Dai to cross River Wei and attack Beiyuan； while the attempt to set fire to the bridges was confided to Hu Ban and Wu Yi。 The general attack on the Wei camp by River Wei was to be made by three divisions： The front division under Wang Ping and Zhang Ni； the middle division under Jiang Wei and Ma Zheng； the rear division under Liao Hua and Zhang Yi。 The various divisions started at noon and crossed the river； where they slowly formed up in battle order。
Wei Yan and Ma Dai arrived Beiyuan about dusk。 The scouts having informed the defenders of their approach； Sun Li abandoned his camp and fled。 This told Wei Yan that his attack was expected； and he turned to retire。 At this moment a great shouting was heard； and there appeared two bodies of the enemy under Sima Yi and Guo Huai bearing down upon the attackers from left and right。 Wei Yan and Ma Dai fought desperately to extricate themselves； but many of the soldiers of Shu fell into the river and drowned。 The others scattered。 However； Wu Yi came up and rescued the force from entire destruction； and moved across the river to make camp。
Hu Ban set half his troops to navigate the rafts down the river to the bridges。 But Zhang Hu and Yue Chen stationed near the bridges shot clouds of arrows at them； and the Shu leader； Hu Ban； was wounded。 He fell into the river and was drowned。 The crews of the rafts jumped into the water and got away。 The rafts fell into the hands of the soldiers of Wei。
At this time the front division under Wang Ping and Zhang Ni were ignorant of the defeat of their Beiyuan army； and they went straight for the camps of Wei。 They arrived in the second watch。
They heard loud shouting； and Wang Ping said to Zhang Ni； 〃We do not know whether the cavalry sent to Beiyuan has been successful or not。 It is strange that we do not see a single soldier of the enemy。 Surely Sima Yi has found out the plan and prepared to frustrate the attack。 Let us wait here till the bridges have been set on fire and we see the flames。〃
So they halted。 Soon after； a mounted messenger came up with orders： 〃The Prime Minister bade you retire immediately； as the attack on the bridges has failed。〃
Wang Ping and Zhang Ni attempted to withdraw； but a bomb exploded and the troops of Wei； who had taken a by…road to their rear； at once attacked。 A great fire started also。 A disorderly battle ensued； from which Wang Ping and Zhang Ni eventually forced their ways out； but only with great loss。
And when Zhuge Liang collected his army at Qishan once more he found； to his sorrow； that he had lost more than ten thousand troops。
Just at this time Fei Yi arrived front Chengdu。
Zhuge Liang received him and； after the ceremonies were over； said； 〃I would trouble you； Sir； to carry a letter for me into East Wu。 Will you undertake the mission？〃
〃Could I possibly decline any task you laid upon me？〃 said Fei Yi。
So Zhuge Liang wrote a letter and sent it to Sun Quan。 Fei Yi took it and hastened to Capital Jianye； where he saw Sun Quan； the Ruler of Wu； and presented this letter：
〃The Hans have been unfortunate； and the line of rulers has been broken。 The Cao party have usurped the seat of government and still hold the mand。 My late master； Emperor Bei； confided a great task to me； and I must exhaust every effort to achieve it。 Now my army is at Qishan； and the rebels are on the verge of destruction on River Wei。 I hope Your Majesty； in accordance with your oath of alliance； will send a leader against the north to assist by taking the Middle Land； and the empire can be shared。 The full circumstances cannot be told； but I hope you will understand and act。〃
Sun Quan was pleased at the news and said to the envoy； 〃I have long desired to set my arm in motion； but have not been able to arrange with Zhuge Liang。 After this letter I will lead an expedition myself； and go to Juchao and capture Xincheng of Wei。 Moreover； I will send Lu Xun and Zhuge Jin to camp at Miankou and Jiangxia； and take Xian