"I see!" After listening to Liu Chan's explanation, Zhang Fei suddenly realized.

Looking at the map, Liu Chan's face showed a solemn expression, and he muttered: "Not only can Zhang Ren not come back, but I also feel that the garrison in Jingzhou is insufficient, and I want to transfer some back." ”

Wancheng is the barrier of Xuchang and Luoyang, once Wancheng is lost, then Wei can be said to have the worry of destroying the country, and if Wei is destroyed, Jiangdong will not be able to survive for a long time, so Liu Chan knows that in this battle, Wei and Jiangdong will definitely fight hard and want to force themselves to retreat.

Relying on Ma Jian and Zhang Ren alone, if you want to defend Jingzhou, I am afraid that it is not enough insurance.

Zhang Fei smiled when he heard this: "Your Majesty, with Zhang Ren and Ma Jian guarding Jingzhou, Jingzhou can be said to be as stable as Mount Tai, you don't have to worry too much." ”

Liu Chan just nodded and didn't say anything.

Due to the fatigue of the march, Liu Chan and the generals rested early, and the next morning, Liu Chan summoned the generals to come over, first out of the camp, and inspected Wancheng well.

After inspecting Wancheng, Liu Chan returned to the camp with the generals.

In the big tent of the Chinese army, the generals are lined up on both sides, and on the left are Zhang Fei, Deng Ai and others, led by generals from Guanzhong. On the right are the generals from Jingzhou, led by Guan Ping, Guan Xing and others.

Liu Chan sat on the handsome case and said to the generals: "You have also seen Wancheng, and let's talk about it, what is the way to take Wancheng?" ”

Deng Ai arched his hand and said: "Today's Wancheng has two city walls, which are in the shape of a zigzag. The inner city is made of rammed earth, four feet high, and the rammed earth city wall cannot withstand the bombardment of the return artillery.

The outer city wall is made of concrete, except for the east gate city wall, which is only one zhang and eight feet, the other three gates have a height of three zhang, and a female wall is also built on it, soldiers can go up to the city to defend, this kind of city wall cannons can not be destroyed at all.

Fortunately, the east gate is not high, only one zhang eight feet, due to the destruction, the wall is uneven, the Wei army can not build a female wall, the wall can not stand people, so if you want to take Wancheng, you can also use the east gate as a breakthrough. ”

Liu Chan nodded and asked, "Then I don't know what your plan is?" ”

Deng Ai smiled and said: "The Wei army desperately wants to build a concrete city wall, isn't it our return cannon that is afraid?" Now you can also take Wancheng with the return cannon. Your Majesty, please borrow pen, ink, paper, and inkstone! ”

"Hmm!" Liu Chan nodded, indicating his intentions.

Seeing Liu Chan's answer, Deng Ai walked to Liu Chan's handsome case, picked up a piece of rice paper, and drew it on the handsome case.

After a while, Deng Ai painted Wancheng, put the pen and ink away, walked to the map with rice paper, took the map down, and hung up the rice paper.

The generals looked at the rice paper, which was painted with a glyph-shaped diagram of Wancheng.

Deng Ai pointed to the map and said: "Generals, please see, now Wancheng has two inner and outer city walls, which resemble a huizi, and between the inner and outer city walls, there is a huizi corridor more than eight zhang wide.

The outer wall of the east gate was damaged, and it was only one foot and eight feet. The remaining three doors are three feet high, and it is a concrete city wall, the return cannon can not be destroyed, if it is attacked, it must be lost to the soldiers, even if the outer wall is taken, there is a city wall inside, and between the two walls is only eight zhang wide, the terrain is narrow, although there are many soldiers and horses in our army. But it can't be separated from this cast.

If you choose to attack, if the enemy throws fire oil and dry wood from the inner wall and sets fire to this zigzag corridor, the consequences will be even more unimaginable.

Therefore, if you want to take the second of our army, you can first use the return artillery, and you have to start from the east gate. ”

Deng Ai paused and continued: "You can first build a large number of return cannons and place them outside the east gate. The eastern gate wall was only one foot eight feet high, and could not defend the inner city inside, so it could be bombarded with return artillery, and although the inner city could not be razed to the ground, it could be cut to the same height as the outer city. ”

"Not bad!" The generals nodded when they heard this.

The first general muttered: "Even if the return cannon is placed at the east gate and the inner wall of the east gate of Wancheng is cut down, it is still one zhang eight feet high, and the eight zhang wide corridor in the middle is still insurmountable." ”

"Can't you fill it up if it's insurmountable?" Deng Ai smiled and said: "Our army can prepare more sandbags, accumulate rolling stones, throw rolling stones first, and then throw sandbags to fill in this zigzag corridor." At a height of one foot and eight, it doesn't take many rolling stones and sandbags.

After filling it in, the east gate of Wancheng has become a wall pier more than eight zhang wide, one zhang and eight feet high, and one zhang and eight feet high. ”

One foot and eight feet, but four meters high, the city wall of this height is simply undefensible, arrows can be easily shot up, and soldiers can climb up in a few steps.

In siege battles, it takes a certain amount of time for soldiers to climb ladders, and it takes time for soldiers at the head of the city to defend the city, throw stones, and shoot arrows.

If it is a high city, the siege soldiers climb the ladder, it takes a long time, and the defending soldiers release arrows and hit one down, but they still have time to move the stones and bend the bow and arrows again to deal with the next one.

But in a low city like that, the soldiers climbed up in a few steps, and the soldiers defending the city threw a stone and went to pick up the second stone, and maybe the next besieging soldier would climb up to his face and not be able to defend it at all.

That's why tall cities are easier to defend and lower ones are harder to defend.

"Wonderful!" Listening to Deng Ai's words, Liu Chan couldn't help but stroking his hands in admiration.

"Thank you, Your Majesty, for the compliment!" Deng Ai arched his hand and retreated to his position.

Liu Chan said to the generals: "Shizai said such a clever plan, if I don't use it, wouldn't it be a tyrannical thing?" Deng Ai! ”

"The last general!" Deng Ai heard the words and gave up his hand again.

"I'll give you 10,000 soldiers and horses, cut down trees, and build a return cannon!"

"Huang Xu!"

"The last general!"

"I will give you 10,000 soldiers and horses, collect stones, the more the better!"

"Guan Ping!"

"The last general!"

"I will give you 20,000 soldiers and horses, prepare bags, fill them with sand and soil for later use, the more the better!"

"The last will obey!" The three generals will give up their orders.

Liu Chan gave an order, and the three generals immediately led their troops into action.

It is not difficult to cut down trees to create return artillery, there are many trees in the nearby mountains and forests, and there is no shortage of craftsmen who are good at building return guns in the Han army.

As for the preparation of stones, it is not difficult, and there are also stone mines that were mined by the Wei army in the vicinity.

The only trouble is to prepare sandbags, the Han army does not have extra linen in their hands, this has to go to the nearby city to purchase, and then compile the city bag, so Liu Chan gave Guan Ping 10,000 more soldiers and horses to facilitate action.

With such a big move by the Han army, it was naturally impossible to hide the soldiers and horses of Wancheng.

Hu Zhen and the generals came to the city and looked at the Han troops who were heading in all directions.

"The Shu army is menacing, it just arrived yesterday, and today it is busy preparing to attack the city." Looking at a group of soldiers and horses entering the mountains and forests, Hu Zhen understood that the Han army wanted to build a return cannon to attack Wancheng.