In this era, the Tiger Prison Pass is better than the Hangu Pass, because of the big battle before the Tiger Prison Pass a few decades ago, although in Liu Yi's view, it is not a big battle, but for the people of this era, the impact is big after all, in comparison, although the Hangu Pass is dangerous, known as the place where the soldiers must fight, but there has been no decent war in these decades.

At the beginning, when Dong Zhuo entered Beijing, the Han Dynasty was not in chaos, this Hangu Pass was naturally taken over by Dong Zhuo, and then Dong Zhuo retreated to Guanzhong, which was originally blocked by Hangu Pass, but Dong Zhuo died soon after, Guanzhong was in chaos, and Hangu Pass was guarded by no one, until Cao Cao went west, Hanhan Valley Pass was abandoned, and the new Hangu Pass was newly built, five kilometers north of the old site of Qin Pass.

"This is Hangu Pass?" Standing on a peak ten miles away from Xinguan, Liu Yi held a telescope and carefully looked at the Guancheng that was sandwiched between the mountains and the river, although he did not see it at close range, but visually speaking, the height of Guancheng about three zhang is not too high, but it is inevitable that the mountain is extremely steep, and it is impossible to climb to the south peak to fight high and low through the mountain range as Cao Cao or Ma Chao did when he dealt with Yangping Pass.

If this is the case, Hangu Pass cannot be called a dangerous pass, but the Hangu Pass in front of him does not feel dangerous to Liu Yi.

"Exactly!" Yu Ban 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 and sketched and calculated it on the ground: "The wall is about three zhang high, the gate is not wide, and the river beach in front of it is narrow, at least it can accommodate the battle formation of the predecessors, but the area of the city wall is not wide, and no matter how many troops are used, if the conventional way of attacking the city is to attack the city, there are not many soldiers and horses defending the city, and it is difficult to conquer!" ”

"Exactly!" Yu Ban nodded: "Back then, Qinhangu Pass was just a plateau, with high mountains on both sides, and pedestrians could only take Hangu Pass if they wanted to pass, but then for some reason, the Hongnong River was getting lower and lower, revealing a large area of river beach, and pedestrians did not have to go to the Qin Pass again. ”

Liu Yi nodded, didn't speak again, and used a telescope to observe the surrounding landforms, the reason for the drop in the water level of the Yellow River...... He doesn't know too well, but even if Qinguan is rebuilt, there is no point in coming, there are too many places to come, whether it is Weihangu Pass or Hanguan on the Xin'an side, it is impossible to completely block the roads in Guanzhong and Luoyang, even if there is a detour, there is always a road to go, unless Guancheng is established in each place to form a zone dominated by Guancheng.

It's just that the point of doing this is not great, not to mention the loss of money and labor, there is no point, after all, not everything is easy to defend and difficult to attack, and without cement technology, most of the city walls of the Han Dynasty are rammed earth, and a heavy rain may collapse the kind, to all of them are made of bricks and stones like Hangu Pass, without technology, just this piece of defense system, it will take more than ten years, there is no need.

Not to mention the Wei side, under Liu Bei's rule, except for a few important cities, most of the cities are also surrounded by rammed earth walls, and such cities are generally not too difficult to fight.

"Let's go, let's go and see Hangu Pass on the Xin'an side, if we can, lay them together, and it is best for these two sides to form a whole!" Liu Yi stood up, threw away the dead branch in his hand, and smiled at Yu Ban.

"Whoa!" Yu Ban nodded in agreement.

Liu Yi looked at Pang De and asked, "Command, if you are asked to attack this level, how do you want to attack it?" ”

"Trick the Wei army into the pass, and take the opportunity to pass more." Pound was stunned when he heard this, and hurriedly bowed down and said.

"How many soldiers and horses do you need?" Liu Yi asked with a smile.

Pang De calculated in his heart and said: "With this scale, there should not be many garrisons in normal times, and they are not forcible attacks, there are enough for a thousand people." ”

Liu Yi nodded, and took off an arrow from his waist: "You take this order to find Guan Ping, give you 3,000 men and horses, take this pass as quickly as possible, and let Guan Ping divert to Xin'an, where we will meet." ”

"Whoa!" Pang De was overjoyed when he heard this, and now Cao Jun is completely defenseless against their soldiers and horses, and there is a great chance of winning this new pass, Liu Yi This is equivalent to giving him a merit.

"Go ahead!" Handing over the token to Pang De, Liu Yi waved his hand and smiled.

"Mo Hou's safety ......" Pang De hesitated for a moment and looked at Yu Bandao.

"Wen Ze will protect me, don't worry." Liu Yi smiled and said, this is also a test for Ban, he has the power of self-preservation, if Yu Ban really dares to take this opportunity to harm him, it can be regarded as pulling out a nail in advance, and in Liu Yi's opinion, it is unlikely that Yu Ban will play a bitter trick, after all, it is true that Cao Pi harmed his whole family, and the only possibility that Yu Ban hated them is that Yu Ban counted this account on the side of the Han, then Liu Yi has nothing to say, just kill it.

If Yu Ban didn't have this thought, then Liu Yi's words could also buy people's hearts, right? Anyway, there will be no loss.

"Oh, the last general will retire!" Pang De glanced at Yu Ban again, bowed and retreated.

After Pang De left, Liu Yi looked at Yu Ban and said with a smile: "General Wen Ze, let's go too, otherwise it will be difficult to find a place to stay tonight." ”

"Whoa!" Just as Liu Yi thought, Liu Yi's trust did make Yu Ban grateful, and he admired Liu Yi even more, and took care of Liu Yi quite properly along the way.

Compared with Xinguan and Qinguan, the defense of Hanguan is very wide, from the bank of the Yellow River to Yiyang, just like the kind of defense system conceived by Liu Yi before, although there is only one Hanhan Valley Pass, but the entire defense system is a hundred miles away, although the army is sad, but for small forces, there are many places that can penetrate.

Liu Yi remembered that when he studied the history of the Han Dynasty in the history books before, it was in this way that the Red Mei Army was broken into pieces, easily bypassing Hangu Pass and entering the pass, and easily passing through the weakly defended Qin Pass to directly break through Chang'an.

"Hangu Pass is the first of the eight passes in Luoyang, but in terms of topography, it is far inferior to Qin Pass and Xinguan." Yu Ban followed Liu Yi's side, explaining as he walked.

The night is deep, and all that can be seen is only the vague outline and the faint firelight in the night, this Hangu Pass, together with Lu Hun Pass and Mengjin, is a whole system in the west, but the direction of defense is different, but because of the establishment of Xinguan, the defense of this Han Pass is a little weak.

Liu Yi took advantage of the light of the torch to roughly sketch the map, and at the same time ordered someone to inform Guan Ping, asking Meng Da to bring a group of soldiers and horses over first to occupy the Han Pass, and then talk about the rest.

Liu Yi came this time, with 30,000 troops, in terms of tasks, his troops are relatively abundant, after careful investigation of the topography of this area, Liu Yi decided to ignore Tongguan first, first cooperate with Guan Yu to Hangu Pass, Mengjin, Luhun Pass, Yiyang, Xin'an This area occupies, and Guan Yu formed a two-sided attack on Luoyang, blocking Luoyang's reinforcements, after going to Xinguan and Qinguan to block all the roads, not allowing Cao Jun to have the opportunity to support Guanzhong, as long as Cao's reinforcements are blocked, Hongnong River Tongguan occupies little significance, As long as Guanzhong succeeds, Tongguan and Hongnong will become lonely cities, and they will naturally be in the pockets of the big man.

This battle can be won!

Liu Yi took Yu Ban and a group of guards to hide in the mountains, temporarily built a few grass huts to live, and began to make a sand table in his tent, the terrain and landform between the three Hangu Passes along the way are almost explored, and at this moment to make a sand table, it looks more three-dimensional than the map.

"Mohou, are you a grass hut?" Yu Ban felt that this was the most luxurious straw hut he had ever lived in.

Although it looks like a straw hut from the outside, it is quite exquisite in terms of structure and furnishings inside, with special beds and tables, and the most excessive thing is that there is an independent kitchen, in which the mind is relaxed, it is obviously a bed made of hay, but it is very comfortable to sleep on, and I feel that the fatigue of the day is quickly eliminated, which is probably more comfortable than the most luxurious house in the capital.

"yes, you can't see it?" Liu Yi carefully placed the finished Guancheng in the gap of the mountain road, measured it with a measuring stick, and compared the proportions of the two sides.

"Look...... I saw it. Yu Ban sighed, I had heard that Liu Yi was good at craftsmanship, and it was really unusual when I saw it today.

"Wen Ze can't have lived in Xiangyang or Gangneung, right?" Liu Yi had already gotten a glance at Yu Ban.

Yu Ban's face was a little embarrassed, he had been in Xiangyang Prison for more than seven years, after coming out, Guan Yu didn't treat him very well, and sent him directly outside the city, he lived in it, but he lived in a cell, Liu Yi didn't set up a cell at that time to let the prisoners enjoy happiness, Liu Yi remembered that the attributes at that time were more than 30 times less comfortable, more than 30 years of mental torture, and more than 30 years before the painful reform, but these attributes were obviously of little use to Yu Ban.

After all, it will only take effect on the basis of his own mistakes, and from Yu Ban's standpoint, he is not wrong, and naturally it will not take effect, but the attribute of reduced comfort and mental torture, Yu Ban has definitely not been very good over the years.

"I didn't ask." Liu Yi saw that Yu Ban's face was wrong, and he changed the topic and smiled: "This battle can make contributions, Wen Ze is indispensable, after the war, I will ask the court for Wen Ze's credit, and when the time comes, a new Chang'an will be built, and even if Luoyang can be captured, it will be built together, and when the time comes, it will be settled here, and these things will not be strange." ”

Yu Ban smiled reluctantly, sighed and said: "When I have been forbidden to live in seclusion for several years, and I don't want to come out again, the world has changed greatly, and now that I am old, most of my old friends have passed away, and those who are alive are afraid that they will be enemies when they see each other in this life, and I don't ask for these things outside my body." ”

"You're not much older than me, so why do you have such thoughts?" Liu Yi shook his head with a smile and said: "Even if Wen Ze is unwilling to be an enemy of Cao Wei, it is not impossible to use it in the future, so the Southern Xiongnu, the Western Regions and even ...... Soochow, why do you have to get old so quickly? ”

Yu Ban heard this, and was silent, now he has indeed lost the enthusiasm and pride of the past.