Cao Cao sent troops this time, not only Yangping Pass and Shangyong. There were at least two suitable troops to walk from Guanzhong to Hanzhong. Cao Ren and Cao Hong were considered partial troops, and the main force, Cao Cao divided into three groups, Xiahou Dun, Xu Huang and Zhang He led a group of troops to advance together. However, Liu Yi had already made sufficient preparations for the defense here and took advantage of the advantage of the advantage of the advantage of the advantage of the geographical advantage. The battle between the two sides lasted for several months but still failed to capture several pass cities.

The main battlefield is still at Yangping Pass, and Huang Zhong and Wei Yan are now stationed separately.

In the first month of the 19th year of Jian'an, Liu Yi arrived at Yangping Pass, but did not bring much change to the situation. As the defender, he had a geographical advantage, and under the restrictions of Cao Cao's army, it was not easy to make any tricks.

"Where is Ma Chao now?" In front of the huge sand table, Liu Yi looked at the mountains and rivers above the sand table, frowned and looked at Wei Yan beside him.

After he left, Huang Zhong specially sent someone to send the sand table to Yangping Pass. Later, Cao's army divided his troops to attack. Huang Zhong left Yangping Pass, but the sand table was not taken away.

"Since he was defeated last year, there has been no news about Ma Chao. I heard that he had escaped into the Qiang land!" Wei Yan shook his head and said.

Wei Yan could understand Liu Yi's thoughts. If Ma Chao went out of the rear of Cao's army at this time, he would not say that he would help them deal with Cao Cao, as long as Ma Chao made a comeback and harm Xiliang, it would be better to capture a few counties. Cao Cao would have to consider the dilemma of being attacked from both sides.

Wei Yan also had this idea. He sent a letter to Ma Chao to advise him in the hope of joining forces with Ma Chao, but Ma Chao is now missing, and Cao's army is approaching, so it is already difficult to defend the city. All the important roads have been blocked by Cao's army. It is not easy to contact the outside world now.

"I think of a way. Hanzhong is also in the Qiang land. I wonder if any of the officials and generals in Hanzhong have contact with the Qiang people. If they can contact Ma Chao, they may force them to retreat to Cao Cao." Liu Yi frowned.

Cao Cao was coming with great momentum, and it was impossible to win like the Battle of Red Cliff. What he could do now was just to force Cao Cao to retreat. Liu Bei had already reached Luocheng. Once Luocheng was broken, the next thing was Cheng, and the capital was Cheng, but Cheng, a big city like Cheng, just like Jiangling. If it weren't for the new weapons provided by Liu Yi at that time, and the lack of Cao's defenders and the new warships, historically, Jiangling Zhou Yu had not captured it for a year.

Cheng, the city is full of troops. In history, Liu Bei attacked Cheng for more than a year, but in the end he failed to capture it. Liu Zhang took the initiative to surrender, but now the Cao army is in a big way, and the situation is different from that in history. Liu Zhang may not surrender at this time. As long as he is unwilling to open the city gate, it will not be easy for Liu Bei to break the city. If Liu Bei cannot successfully capture Shu, Cao Cao may not retreat. If Cao Cao does not retreat, Liu Zhang will still have the courage to defend.

Now Cao Cao did not attack Jiangdong at this time as in history, but instead led his army to come here. However, the troops in Jingzhou could not be moved lightly at this time. Sun Quan's attitude was a bit ambiguous. At this time, if the two families joined forces, Jiangdong took the opportunity to send troops to Jianghuai and Guan Yu attacked Xiangfan, Cao Cao would definitely be asked to retreat.

But as Cui Zhouping analyzed with Liu Yi at the beginning, Sun Quan was obviously unwilling to see Liu Bei get to Yizhou at this time. Although the troops in Jingzhou were gone from Cao Cao's threat, they had to beware of the threat from Jiangdong.

Although Liu Yi and Pang Tong persuaded Liu Bei to gain many advantages in the early stage, and also took over the fertile land of Hanzhong, with more troops than in history, the current situation is much more difficult than in history when Liu Bei captured Yizhou in history. However, if he could defeat him, the profits would definitely be higher than in history. At least Liu Bei's foundation was more stable than in history or in Romance. Moreover, if Zhuge Liang, Zhang Fei, and Zhao Yun were transferred to Shu, Jingzhou would undoubtedly be safer. If Yizhou was captured, Liu Bei's power would usher in a take-off, and the pattern of the Three Kingdoms was completely settled.

But the premise of all this is to defend Hanzhong and Liu Bei was able to successfully capture Yizhou. It is not difficult to defend Hanzhong at present. Liu Yi could even develop with peace of mind, but Liu Bei's side now seems to be in a hard battle.

I don’t know if that guy Pang Tong is fine?

Wei Yan didn't know that Liu Yi had changed so many thoughts in his mind. He heard Liu Yi say this and nodded silently: "I'll try it. I've captured some Ma Chao's troops before, and now I'm just putting them back. See what Ma Chao meant. If he was willing to send troops, it would be better."

Liu Yi nodded, but he was still worried. He and Wei Yan could think of this question, but Cao Cao would not have thought of it?

However, I can't take care of so much now. It's always good to have a helper. At this time, in order to fight against Cao's army, we naturally have to unite all the forces that can be united. At present, it seems that only Ma Chao is left around us.

Liu Yi didn't care much about guarding the pass. Wei Yan was much more capable than him. Just looking at Cao's army's formation, Liu Yi thought about it and led a group of craftsmen to the top of the mountain, preparing to expand the camp on the mountain.

Since Pang De led his troops up the mountain to seize the camp last time, Wei Yan's attention to the two hills has increased a lot. With sufficient troops, the troops in the two hills are fully organized.

When Cao's army came here, they naturally discovered the wonderful uses of the two hills. Xiahou Dun had wanted to capture the hill camp for his own use. However, facing the strong camp on the hill, Cao's army failed to attack the mountain several times, so he could only rest.

What Liu Yi was thinking now is whether he could use the advantage of the mountain to build a few stone throwing platforms on the mountain and throw stones directly into Cao's army camp. There was no need to polish it into stone bombs, just a large pile of gravel was enough. Even if it could not cause too much casualties, it would still make the Cao army uneasy.

Of course, this is just Liu Yi's idea. He can attack Yangping Pass from the top of the mountain, but he cannot attack Cao's army's camp, and small stones are not enough. If he wants to include Cao's camp within the scope of the stone throwing platform, Liu Yi has to set up a stone throwing platform in the direction close to Cao's camp, but this will increase the risk factor a lot.

Liu Yi also relied on the Shu army's good at mountain warfare that he dared to have this idea, pushing the camp on the mountain down to the vicinity of Cao's camp, and then began to dig soil to build a platform where Cao's army could not reach.

Xiahou Dun was also worried that the Shu army on the mountain would take advantage of the cover of the mountains and forests to attack, so the trees around the military camp were completely viewed. If the Shu army appeared within sight, they would immediately find it.

"It's almost done, and you'll be discovered when you move forward!" Liu Yi measured the distance between the two sides, shook his head with regret and said, "Xiahou Dun is quite cautious! Retreat!"

The soldiers responsible for protecting Liu Yi breathed a sigh of relief. This distance was too close to Cao's camp.

Liu Yi followed the elevator back to Yangping Pass. Wei Yan hurriedly stepped forward to ask about the situation: "Sir, how?"

"No, the nearest place is also three hundred steps away from the Cao army camp. Although our rock-throwing cart has a long range, the distance is too far to reach." Liu Yi sighed. The two sides are in a stalemate at the moment. If you attack the city, Xiahou Dun has experienced the power of the Yangping Pass defending equipment, so he rarely takes the initiative to attack, but Wei Yan dares not attack rashly. If you fight in a field, the Shu army is obviously not a match for Cao's army.

In this situation, both sides know the other party’s weaknesses and strengths, and understand where their own advantages and disadvantages are. They dare not move lightly, and they cannot deceive the other party, so they can only stare at them like this.

The war has reached a deadlock. Although there are still daily offensive and defensive battles, the losses of both sides are not too great.

At this time, the role that Liu Yi could play was used up. In terms of logistics, Yan Pu did a very good job. Liu Yi went to Huang Zhong again. The situation was basically the same. Liu Yi only helped to strengthen the city defense and made some defense equipment. After helping to return to Ziwu Valley, the war has not been fought for endurance. It depends on who can survive until the end, or whether Liu Bei gave up attacking Yizhou or Cao Cao gave up attacking Hanzhong. The three armies were dispatched. Although Cao Cao was so powerful, the consumption of food and grass was also a huge burden.

Hanzhong is a local war, and the food and grass are consumed relatively little, but it also needs to provide Liu Bei with logistics. Liu Bei has now occupied many cities in Shu and can also provide part of it to his rear.

This stalemate lasted until April, when the road to Ziwu Valley had been basically completed, Liu Yi was building the final level, but the news from Shu forced Liu Yi to stop his work.

"What did you say?" Liu Yi narrowed his eyes at the messenger in front of him.

"The military advisor was hit by the ravage arrow in the battle of Luocheng without believing it, and was seriously injured. The lord asked the lord to go to Shu immediately to join the lord. The prefect of Hanzhong will be temporarily appointed by General Wei Yan." The messenger who came to pass the order bowed and said.

"How is Shi Yuan's injury?" Liu Yi looked at the messenger and asked.

Did Pang Tong, the unlucky guy, finally not escape this disaster?

"Because the military advisor has a lot of armor on his body, the accompanying army is not fatal. The accompanying military doctor has helped him with diagnosis and treatment. He is not afraid of his life, but he just needs to be well recuperated." The messenger bowed and said, "Sir, please set off as soon as possible."

Liu Yi frowned. What can he do if he goes there? But at this time, he really can't transfer Zhuge Liang back. The situation in Jingzhou is without Zhuge Liang's charge, and there may be some chaos.

"Lord, do you have other orders for transfer?" Liu Yi asked while ordering people to pack up his luggage.

"The lord ordered people to go to Jingzhou. As for the specific orders, I don't know the humble position." The messenger shook his head.
Chapter completed!