In this era, Hulao Pass is more important than Hangu Pass. Because of the big battle before Hulao Pass decades ago. Although it was not a big battle in Liu Yi's opinion, it had a great impact on people in this era. In comparison, although Hangu Pass is dangerous and is known as a place where military strategists must fight, no decent war has occurred in these decades.

When Dong Zhuo first entered Beijing, the Han Dynasty was not in chaos. The Hangu Pass was naturally taken over by Dong Zhuo. After that, Dong Zhuo retreated to Guanzhong and originally blocked Hangu Pass, but soon Dong Zhuo died. Guanzhong was in chaos and no one came to guard Hangu Pass. Until Cao Cao advanced westward, Hangu Pass was abandoned and the current new Hangu Pass was built, five kilometers north of the former Qinguan site.

"Is this Hangu Pass?" Standing on a peak ten miles away from Xinguan, Liu Yi held up a telescope and looked at the Guancheng, which was sandwiched in the middle of the mountain and river. Although he did not look closely, it was estimated that the height of Guancheng was about three meters high, but the mountain was inevitably extremely steep. It was impossible to climb through the mountains like Cao Cao or Ma Chao to deal with Yangping Pass to the south peak to fight the high and low.

If this is true, Hangu Pass cannot be called a dangerous pass, but the Hangu Pass in front of him does not give Liu Yi the feeling that it is dangerous pass.

"That's right!" Yu Jin nodded and said in a deep voice.

Liu Yi handed the bamboo telescope to Pang De, squatted down and found a branch from the ground to outline and calculate it: "The wall is about three meters high, the city is not wide, and the river beach in front is narrow, which can at least accommodate the battle formations of the predecessors. However, the city wall is not wide, and no matter how many troops are, it is useless. If the conventional fighting method comes to attack the city, even if there are not many soldiers defending the city, it will be difficult to conquer!"

"That's true!" Yu Jin nodded: "At that time, Qin Hangu Pass was just a plateau with mountains on both sides. Pedestrians had to pass by only Hangu Pass. But later, for some reason, the water of Hongnong River was getting lower and lower, revealing a large area of ​​river beaches. If pedestrians pass by, they don't have to go to Qin Pass again. Therefore, Cao Gong ordered people to build this Hangu Pass, but the terrain was far less dangerous than Qin Pass."

Liu Yi nodded and said nothing. He used a telescope to observe the surrounding landforms. The reason for the drop in the Yellow River water level... He was not very clear, but even if Qin Pass was rebuilt, it would be meaningless. There were too many places to come. Whether it was Wei Hangu Pass or Han Pass in Xin'an, it was impossible to completely block the roads in Guanzhong and Luoyang. Even if you detour, there were always roads to go, unless you built a Guancheng to form a zone dominated by Guancheng.

But this is not very meaningful. Not only is it wasteful and money, it is meaningless. After all, not all places are easy to defend and difficult to attack. Moreover, without cement technology, most of the city walls of the Han Dynasty were piled up with rammed earth, and a heavy rain could collapse. They all have to be built of bricks and stones like Hangu Pass. Without technology, this defense system alone would take more than ten years, and it would be unnecessary.

Not to mention the Wei State, in addition to a few important cities under Liu Bei's rule, most of the cities are also surrounded by rammed earth. Such cities are generally not too difficult to fight.

"Let's go and see the Hangu Pass in Xin'an. If possible, you can defeat them together. It's best to form a whole on both sides!" Liu Yi stood up, threw away the dead branches in his hand, and smiled at Yu Jin.

"Here!" Yu Jin nodded and agreed.

Liu Yi looked at Pang De and asked, "Receive the order, if you are asked to attack this level, how do you want to attack?"

"I pretended to be a Wei army and sneaked into Guanzhong and took the opportunity to do more gates." Pang De was stunned when he heard this and bowed quickly.

"How many soldiers are needed?" Liu Yi asked with a smile.

Pang De calculated in his heart: "With this level, there should be not many troops garrisoned in normal times, and it is not a strong attack, and there is only a thousand people."

Liu Yi nodded and took a command arrow from his waist: "You hold this order to find Guan Ping, give you three thousand troops, and take this pass as quickly as possible. In addition, let Guan Ping change the route to Xin'an, where we meet."

"Here!" Pang De was overjoyed when he heard this. At the moment, the Cao army was completely unprepared for their troops and had a great chance of winning the new pass. Liu Yi was equivalent to giving him a contribution.

"Go!" Liu Yi waved his hand and smiled.

"The safety of Mo Hou..." Pang De hesitated for a moment and looked at Yu Jindao.

"Wen Ze will protect me, so don't worry." Liu Yi smiled. This was also a test for Jin. He had the power to protect himself. If Yu Jin really dared to take this opportunity to harm him, it would be considered to remove a nail in advance. Moreover, in Liu Yi's opinion, Yu Jin's possibility of playing a bitter plan is not great. After all, Cao Pi was really hurting his whole family. The only possibility of Yu Jin hating them was that Yu Jin took the account to the Han side, and Liu Yi had nothing to say, just kill him directly.

If Yu Jin did not have this intention, then Liu Yi's words could win people's hearts, right? Anyway, it won't be a loss.

"Here, I'll leave!" Pang De glanced at Yu Jin again and bowed to leave.

After Pang De left, Liu Yi looked at Yu Jin and smiled and said, "General Wenze, let's go too, otherwise it will be difficult to find a place to stay tonight."

"Here!" Just as Liu Yi thought, Liu Yi's trust really made Yu Jin feel grateful and admired Liu Yi even more. He took good care of Liu Yi along the way.

Compared with Xinguan and Qinguan, the defense surface of Hanguan is very wide, from the bank of the Yellow River to Yiyang, just like the kind of defense system that Liu Yi had imagined before. Although there is only one Hanhangu Pass, the entire defense system is a hundred miles away. Although the army is sad, for small troops, there are many places that can penetrate.

Liu Yi remembered that when he was studying the history of the Han Dynasty in history books, the Red Eyebrow Army used this method to break the whole into pieces, easily bypass Hangu Pass and break into Guanzhong, and easily break through Chang'an directly through the weak Qin Pass.

"Hangu Pass is the first of the eight passes in Luoyang, but in terms of terrain, it is far inferior to Qin Pass and Xin Pass." Yu Jin followed Liu Yi and explained while walking.

The night was already dark, and all you could see was the blurry outline and the vague firelight in the night. This Hangu Pass, together with Luhun Pass and Mengjin, is a whole system to the west, but the direction of defense was different. However, due to the establishment of the new Pass, the defense of this Han Pass was a bit weak.

Liu Yi used the light of the torch to roughly outline the map, and at the same time ordered people to inform Guan Ping, asking Meng Da to bring a soldier to take over Han Pass first, and then talk about the others.

Liu Yi came this time and brought 30,000 troops. In terms of mission, his troops were relatively abundant. After carefully investigating the landforms of this area, Liu Yi decided not to care about Tongguan first and cooperated with Guan Yu to occupy Hangu Pass, Mengjin, Luhun Pass, Yiyang and Xin'an, and formed a force of attacking Luoyang on both sides with Guan Yu. After blocking the reinforcements from Luoyang, he blocked all the roads to Xinguan and Qinguan, so that the Cao army would have the opportunity to support Guanzhong. As long as Cao's reinforcements were blocked, the occupation of Hongnong He Tongguan was not very meaningful. As long as Guanzhong succeeded, Tongguan and Hongnong would become lonely cities, and naturally they would be the things in the Han Dynasty.

This battle can be won!

Liu Yi took Yu Jin and his own guards to hide in the mountains, temporarily built several straw sheds to live in, and then started to make sand tables in his tent. The terrain and landforms between the three Hangu Passes along the way were almost explored. At this moment, it would look more three-dimensional than the map.

"Mo Hou, are you a straw shed?" Yu Jin felt that this was the most luxurious straw shed he had lived in since his life.

Although it looks like a straw shed outside, the interior is quite particular, both the architecture and the furnishings are very particular. There are special beds and tables, and the most overwhelming thing is the independent kitchen. When you are in it, you will feel relaxed. The bed is obviously made of hay, but it is very comfortable to sleep on. It feels like the fatigue of the day is quickly eliminated. This is probably more comfortable than the most luxurious house in the capital.

"Yes, can't you tell?" Liu Yi carefully placed the prepared Guancheng in the cracks on the mountain road, measured it with a measuring ruler, and compared the proportions between the two sides.

"Look... I saw it." Yu Jin sighed. He had heard that Liu Yi was skilled in Yu Jiangdao, but today he saw it very different.

"Wenze hasn't lived in Xiangyang or Jiangling, right?" Liu Yi had already taken a look at Yu Jin.

Yu Jin looked a little embarrassed. He stayed in the Xiangyang prison for more than seven years. After he came out, Guan Yu didn't like him very much and sent him out to the city. He lived there but lived in a cell. Liu Yi built a cell at that time and did not allow prisoners to enjoy the happiness. Liu Yi remembered that his attributes at that time were reduced by more than 30% of comfort, mental torture, and pain and change from more than 30% of them, but these attributes were obviously useless to Yu Jin.

After all, the pain of reforming is only effective on the basis of his mistake. From the perspective of Qian, he is not wrong, and naturally it will not take effect. However, the attribute of reducing comfort and mental torture, Yu Jin must have not been very good in these years.

"I didn't ask." Liu Yi saw that Yu Jin's face was wrong and changed the subject and smiled: "Wen will make great contributions in this battle. After the war, I will ask the court for contributions to Wen Ze. Then I will build a new Chang'an. Even if Luoyang can be conquered, they will build it together. When the time comes, they will settle here, and these things will be no wonder."

Yu Jin smiled reluctantly and sighed, "When Jin lived in seclusion for several years and didn't want to come out again, the world has changed a lot. Now that this year's things are high, most of the old friends in the past have left. If you are alive, you may be the enemy. You will not ask for these things outside of your body."

"You are not much older than me, why should you have such thoughts?" Liu Yi smiled and shook his head, "Even if Wen is unwilling to be an enemy of Cao Wei, there will be no place for martial arts in the future. Then, the Southern Xiongnu, the Western Regions and even... Eastern Wu, why should you accept your old age so quickly?"

Yu Jin heard this and said nothing. Now he has indeed lost his passionate passion from the past.
Chapter completed!