Liu Bei's army camp, now Liu Bei's central army has reached halfway, and the front army will arrive in Nanzheng in almost two or three days.

"Lord, why did Bo Yuan come to write a letter at this time? But did he reveal his whereabouts?" Pang Tong came in and saw Liu Bei frown, and couldn't help asking.

"It was exposed~" Liu Bei sighed and handed the letter to Pang Tong and said: "Wen Chang had already captured Mianyang half a month ago and successfully attracted the main force of Hanzhong. Unfortunately, we failed to arrive in time. In order to save Wen Chang, Bo Yuan pretended to be 5,000 people. Zhang Lu had to withdraw his troops by taking the banner of Yun Chang. However, in this way, it would be difficult for us to conquer Hanzhong."

"If the main force in Hanzhong returns to help, he will soon be able to explore the realities of Boyuan in the Qing Dynasty, and he can order the front army to accelerate and meet with Boyuan first." Pang Tong had a toothache. He remembered that road was difficult to walk, and arrived ten days earlier than expected. Why did Wei Yan run so fast?

Liu Bei nodded. Wei Yan's intention to attack the east and west was considered a failure. Now Liu Yi's camp cannot be lost. Otherwise, once Liu Yi retreated, Zhang Lu took advantage of the situation and came here, the road here would be cut off. Then their trip would be in vain.

When Pang Tong saw it at the end, he suddenly smiled and said, "Lord, Bo Yuan, please ask Zhang Lu for some soldiers, horses, food and grass."

"How can Ji Yu give it to him for 30,000 soldiers?" Liu Yi smiled bitterly and shook his head. Since entering Shuzhong, Liu Bei has successively obtained more than 10,000 soldiers and horses from Liu Zhang. Although Yizhou is rich in the country and the people are rich, it is impossible for Liu Zhang to agree to such a law, no matter how stupid Liu Zhang is, he will not agree.

"I just want him to refuse to give it to you." Pang Tong smiled and said, "Otherwise, when our army conquered Hanzhong, what reason would there be to attack Liu Zhang? We were bloody on the battlefield in Yizhou, but Liu Zhang detained our military food and staff in the rear for various reasons, causing General Wei to almost die. Is this reason enough?"

Liu Bei didn't think about this at first, but now Pang Tong understood that Liu Yi was not a joke, but really asked him to ask for it, and he was not prepared for Liu Zhang to give it, just to have an excuse to send troops to Yizhou.

I forgot about this.

However, Liu Bei did not answer. Such things were ultimately incompatible with his image. He planned to write to Liu Zhang in a while, asking for 50,000 yards of black and 500,000 stones of food and grass and money, and give him a million more. Liu Yi had told him before that he wanted to write to Shuzhong to Hanzhong, and the road would start construction after pacifying Hanzhong. He was still considering it before, but now Liu Bei did not consider it anymore. After all, Hanzhong will be his own territory in the future, and road clearance will only benefit and not harm Liu Bei.

Think about what else can I ask for?

"Lord?" Seeing Liu Bei pondering there, Pang Tong couldn't help but shake his hand in front of him.

"What else does Shi Yuan have to do?" Liu Bei came to his senses, subconsciously wiped the corner of his mouth, and asked.

"I still want to discuss with my lord about attacking Nanzheng." Pang Tong said with a smile.

...

Since Zhang Lu did not choose to surrender or retreat, Liu Yi should prepare for the next siege.

With a few craftsmen, Liu Yi began to calculate the defense of Nanzheng City from a distance. Huang Zhong and Guan Ping, who were responsible for protecting Liu Yi, only saw Liu Yi holding a tripod and measuring something. After a while, a set of data was reported, and then the craftsmen around him recorded it. Liu Yi reported the numbers, but on paper, the craftsmen wrote a lot of 123456 symbols, which made people dizzy.

Guan Ping looked at the tripod in Liu Yi's hand with curiosity and asked, "Sir, what is this?"

"It is used to measure the height of the city." Liu Yi replied simply.

"Can this thing be measured?" Guan Ping didn't believe it.

"Yes, just know the distance from the city here, but now there can only be a rough valuation." Liu Yi smiled. In fact, it is just a right-angle triangle with one side and angle and then finding the geometry of another right-angle side. It is not very profound. However, it is not easy for people who don't study mathematics to understand it. Liu Yi just talks about a rough concept. It is best to understand it. If he doesn't understand it, he will not teach it specifically. When he publishes a book in the future, he will buy it and read it himself.

"But sir, the people on the city wall seem to be looking at us." Guan Ping looked at the Hanzhong soldiers on the city wall closely watching this place. If the other party sent troops out at this time, it would be very embarrassed.

"It's okay, let's put down the suspension bridge and open the city gate, we've already run away." Liu Yi smiled indifferently, then looked at the craftsmen and said, "Have you remembered the data?"

"I have already remembered it." Several craftsmen nodded.

"Okay, change the other side!" Liu Yi turned over and said to Guan Ping and Huang Zhong: "Let's go to Ximen."

Huang Zhong and Guan Ping were speechless. Even though they had not started a fight for the time being, they just ran to the bottom of the city to calculate the data. Is it really good?

On the city wall, Yang Ren, who had already returned, frowned and looked at the group: "What are they doing?"

Several generals shook their heads, God knows.

"Look at them, and shoot them immediately!" Yang Ren always felt that there was something wrong with these people, but he didn't know what he was doing, so he could only instruct the soldiers to be alert.

After spending more than an hour, Liu Yi ran around Nan Zheng and collected the data he needed. The next step was to build sand tables and design engineering equipment. The soldiers were constantly cutting wood for backup.

"The height of the city wall in Nanzheng is basically between 52 and 54. Our army's catapult car has an effective range of 200 steps. If it is calculated normally, the height is blocked..." Liu Yi said while composition, catapult car, well and ladder are all the main siege weapons after the war started Liu Yi has made improvements to varying degrees.

The siege equipment in this era basically has room for improvement, especially the catapult car. The existing catapult car did not choose the best point in the issue of force arms, and the range was naturally close. Without considering the attribute bonus, just the change of the force arms, the new catapult car designed by Liu Yi is much more effective than before, let alone the attribute bonus, on the battlefield of this era, it is definitely an enemy's nightmare!

"Do it according to this drawing!" Liu Yi recruited the craftsmen and handed them the new catapult cart and ladder he designed, and asked them to do it themselves. Jing Yan and Liu Yi still wanted to improve it, but it has not been designed yet.

"Sir, this catapult is no different from before." Guan Ping kept watching by his side, and couldn't help but say curiously after seeing the craftsman leaving.

"The change in the force arm is enough to exert stronger effects." Liu Yi smiled.

"What?" Guan Ping looked at Liu Yi with a blank look on his face.

"You will know if you make two models." Liu Yi had no choice but to find some waste wood, and the carving knife naturally slid out of his sleeves, and carved the waste wood.

Seeing the parts quickly formed in Liu Yi's hands, even though I had seen them many times before, Guan Ping still felt dazzling every time he saw them.

In a short while, two catapult models were completed.

"This..." Guan Ping looked at Liu Yi with some confusion: "What's the difference?"

Except for the fact that the poles that catapults seem to be somewhat different, there is no difference in other aspects.

"Look!" Liu Yi pointed to one of them and said, "This is the past."

He picked up a stone from the ground and hit it. With a trigger, the stone shot about three feet away. Liu Yi made a mark on the ground, then picked up the stone and put it on another catapult model, and made the same.

Three feet six!

Guan Ping was surprised to see the two catapult cars that were not very different from each other. The range was so much different? If this was true, the gap would probably be fifty or sixty steps!

"This is the gap!" Liu Yi looked at Guan Ping and smiled. If the gap was not too big, he wouldn't have spent any effort on designing it.

Guan Ping nodded after hearing this: "If it is really so powerful, if there are thirty catapults like this, why worry about Nan Zheng not breaking it?"

"We also have to cooperate with the cloud ladder, the well and the city car." Liu Yi groped his chin and said.

After all, the catapult cart has a deterrent effect on the battlefield than its actual lethality.

"Sir!" Huang Zhong walked in with the curtain, came to Liu Yi, and bowed, "General Wei sent someone to send a letter."

"Oh?" Liu Yi took the letter handed over by Huang Zhong and looked like he saw that the smile on his face gradually disappeared.

"Sir, what happened?" Guan Ping said in confusion.

"Wei Yan's soldiers cannot move for the time being." Liu Yi handed the note to Huang Zhong and sighed.

He didn't expect that the battle in Mianyang would be so tragic that all the troops brought by Wei Yan were killed. That was the elite army brought by Jingzhou!

First defeated Yang Bai, lost hundreds of losses, and then for several days of offensive and defensive battles with Yang Ren, Wei Yan's troops were constantly consumed in repeated battles. Now, there are only less than 300 troops left. Liu Yi had someone tell Wei Yan that it was a bit difficult for him to attack Yangping Pass.

After reading the note, Huang Zhong sighed silently. Three thousand people fought to the end of 300 people. Even if it was a battle to defend the city and the combined losses of several consecutive days, it would not collapse. In addition to being the soldiers of Jingzhou, it was already very rare for Wei Yan to do this. Even if he did not participate in it personally, he could imagine the tragic battle.

This time, it was Pang Shi's calculation error. Of course, there were also reasons why Wei Yan was eager to make contributions and was too rushing. In short, he failed to achieve his strategic goals in advance. However, it was a blessing to lose his horse. This was a blank period. Cao Cao had just returned to the court, and it took a while for the news to be reported in Hanzhong. This period gave Liu Bei the opportunity to seize Hanzhong. At the same time, he could also use the attack on Hanzhong to constantly ask for money, grain and people from Liu Zhang to strengthen himself.

"Just as long as you are fine, I will send someone to send me a letter to Wen Chang, and I will send someone to urge my lord." Liu Yi sat down and said.

There are actually only 500 people in such a large camp. Zhang Lu can find out if he sends someone to test it. Liu Yi seems calm and even dares to go around the city. In fact, he has always lacked a sense of security in his heart, for fear that Zhang Lu can't think of sending someone to test it again.
Chapter completed!