After asking for details, the army gradually entered the city, but Bailiyan was not in a hurry to enter the city, and personally surrounded the Fuhe, surveyed the terrain around, and found some valuable clues.

Yin Yangcheng can be called a flat river, in addition to the Fuhe, the field of vision is wide and there is no danger to defend, which is convenient for the large army to move in the field, and at the same time there is no place to hide, which is also conducive to the defending army to look at the enemy. At the same time, because the Fu River is surrounded, there is no possibility of launching a cave attack.

At the end of the topographic survey, Bailiyan (also Wei Xian) entered the city last. Soon after entering the city, he was recruited by Zhao Xun to the Taishou Mansion to discuss military aircraft.

"General Yao Sheng, this general will introduce you, this is Wei Xian, the general's colonel."

Zhao Xun introduced, Yao Sheng was surprised:

"You are so young, your Excellency is no more than eighteen or nineteen."

"In the sixteenth of this year, there will be Lao Yaosheng and the generals in the future."

Baili Yan gave a deep salute, and everyone was incredulous.

After some greetings, Zhao Xun presided over the defense and began to assign tasks.

After entering the city, Zhao Xun inspected the city defense on the spot, so the first thing he did was to strengthen the city wall.

Although Yin Yangcheng is strategically important, because it is located in the hinterland, the repair rate of the city is very low. I never expected that the Jin army would take advantage of the unrest in Xian to attack on a large scale, and also attacked the bank of the Wangqin River in one go. Especially the one-word city, which has become a ruined wall, can not be defended at all.

"General Yao Sheng, it can be difficult to repair the city wall."

"Back to General Zhao, there is a lack of earthwork, stones, and tools at the moment, and I am afraid it will be difficult to repair in the short term."

Yao Sheng was embarrassed, but Zhao Xun said:

"Even if the house is demolished, the city wall must be repaired."

"No!"

"In addition, there is news on the west bank of the river, and whether people can be sent across the river to connect the news."

"No, you can't. The Jin army on the river was tightly blocked, and if it weren't for Yin Yangcheng standing on the riverside, I am afraid that it would have already been attacked on the shore. The last general sent people across the river six times, but there was no news. At present, even fishermen who are familiar with the water conditions may find it difficult to cross the river. Moreover, in the current winter solar term, the river water is cold, and it is difficult to dive across the river. Only by waiting until next spring will it be possible to dive across the river. ”

As soon as Yao Sheng's words fell, Bai Liyan said thoughtfully:

"General Zhao, there is something I want to clarify below."

"But it doesn't hurt to say it." Zhao Xun looked at Bailiyan and listened carefully.

"Before entering the city, the terrain around the Fuhe River has been explored, and it is found that there is clay nearby, it is better to take advantage of the Jin army before the arrival, let people excavate, and then either repair the city wall, or burn the stone, so that our army can repair the city wall, but also strengthen the defense."

"Oh, there's clay here!"

Zhao Xun's eyes lit up, looked at Yao Sheng, and Yao Sheng said:

The last general did not know about this, and it seems that he had never seen a potter in the area. If there is clay, it can indeed be used to strengthen the city walls. ”

Due to the low productivity of labor and the lack of developed technology, the vast majority of the walls were adobe walls and were not covered with bricks.

Even in ancient China, the brick-covered city wall was gradually raised in the Tang Dynasty, but there was no large-scale brick-wrapping, until the Ming Dynasty began to be Zhu Yuanzhang, and the country began to wrap bricks on a large-scale city wall from top to bottom.

At present, Yin Yangcheng is an adobe city wall, so the damage rate of the adobe city wall is much higher than that of the brick city wall, and the local area is located by the river, the soil has a large water content, and it is not a sunny day in summer, so it is very difficult to repair the city wall.

If clay is used, regular or irregular masonry can be fired from clay, then built and then compacted with clay, so that the walls can be repaired quickly. At the same time, it can also sinter pottery blocks and smash people.

After agreeing on the repair plan, Zhao Xun mobilized the people in the city to dig the clay one mile southeast of the Fuhe River.

At the same time, Yin Yangcheng's abnormal movements, three days later, reported to the Jin army's Feicheng camp Han He's ear, as soon as he heard that Yin Yangcheng was building a large number of buildings, Han He was puzzled, so he asked Tanma:

"Ben will ask you, can you know what the Xian army and civilians are excavating."

"I don't know what I do. The Xian army was full of sentry horses, so many people such as subordinates could not approach. But after observing for two days, I saw fireworks all over the place one mile south of the city, as if something was burning. ”

"What can you burn?" Han He was suspicious and worried that there would be changes, so he asked: "In addition, what is abnormal, the number of defenders of the Xian army can increase." ”

"When the subordinates arrived, they didn't see any reinforcements, and if it was a few days ago, the subordinates wouldn't have known. However, the Xian army cut down a large number of trees and spread logs and straw on the city walls, and I don't know what to do. ”

"Shhh...... Laying logs on top of the city walls? ”

Hearing this, Han He was even more suspicious, and said to Wang Shuo after retreating:

"General Wang Shuo, how can the old man feel that Yin Yangcheng seems to have reinforcements arriving."

However, according to the report from the navy, the navy has blocked the river, and the Xian army has no sign of crossing the river. But the previous attack on Feicheng and the robbery of our army's grain and grass have not been found so far, could it be that this wandering enemy has entered Yin Yangcheng? ”

"Well, it's possible. That being the case, when the front army was quickly ordered, it was necessary to take Yin Yangcheng directly. We also moved the camp quickly, as long as Yin Yangcheng was captured, the Xian army would have no hope of counterattacking. ”

Han He's old man made a deep calculation, and it was expected that the change of Yin Yangcheng's Xian army must be a sign of increasing military strength and strengthening the city's defense. If there are only more than 2,000 defenders, it is obviously not normal to cut down and dig the soil in such a large number of people.

At this time, Han He was still in Feicheng, and more than 20,000 people in the vanguard of the Jin army had been ordered to hold the southwest of Feicheng to provide a barrier for the army to repair.

The reason why Han He did not capture Yin Yang at first was only because two hundred miles south of Yin Yang was the mouth of the Fork River of Wangqin River, and the southwest of the mouth of the Fork River flowed into Zhiguo, so Yin Yangcheng's position was sensitive.

And when the time comes, Zhiguo will come out for Xianguo, and Jin Guo will not be shattered.

So after thinking twice, when Han He captured Feicheng for repair, he transferred 30,000 conscripts from the rear to fill the gap in the division of troops all the way to the city, and then hit Yin Yangcheng when the repair was over.

It's just that he didn't expect the Xian army to react quickly and disrupt the deployment of Hanhe, so he could only urge the 20,000 men of the front army to besiege the city in advance, and wait until the army arrived, and then attack the city.

So it was for four or five days to go back and forth, and Zhao Xun not only repaired the city wall, but also prepared enough rolling wood and stones, and waited for the Jin army to attack the city.

On this day, the Bailiyan city wall commanded to pour dung and pee, in order to prevent the fire from attacking the city wall, temporarily hung logs and straw woven bags on the city wall, and the woven bags were filled with mud and straw dung, and then spread on the city wall, so as to resist the bow and crossbow drenched with pine oil, rocket attacks, and also to resist stone attacks, so it is equivalent to putting a layer of body armor on the city wall.

This kind of defensive measure Han He is also unheard of, obviously not something that can be had at the moment, and it is naturally the result of Bailiyan's tossing.

This measure of "hanging body armor" on the city wall is also a technology that appeared during the Southern Song Dynasty, and the black technology used to defend against the solid projectile of the breech gun at that time is of course impossible nowadays.

Nowadays, the siege equipment is relatively primitive, only rushing cars, ladder cars, broken walls, temporary cars, nest cars, tower cars, crossbows, etc., and trebuchets also have them, but there are many kinds.

The most primitive stone cannon cart needs to be pulled by manpower, and the most advanced giant lever counterweight trebuchet is a product of imitation from the Central Plains of Jinxuedi's instrument technology, but the construction period is very long, time-consuming and laborious, the size is huge, and the transfer is not convenient

Therefore, the city wall is an important means of destroying the city in addition to the city gates. If you can't get to the city by ladder cars, temporary cars, and tower cars, you can only destroy the city walls and gates.

Burn the city wall or use people to attack the city, with hay and firewood poured with pine oil, tung oil fire, causing the wall to expand and shrink by its own explosion, the early opening of the mountain to build the road, is to use pine oil fire to burn the rock, and then splash water and wait for themselves to burst.

Or use a giant crossbow or crossbow cart to fire a crossbow bolt with pine oil, which pierces the city wall and burns, causing it to explode.

Pine oil and tung oil are commonly used combustion agents nowadays, and the calorific value after combustion is very high. Nitrate and sulfur have not been widely used, especially sulfur, only known to Changsun produced a large amount of sulfur, and the output of other countries is almost negligible, so sulfur has become a controlled strategic material, rarely used, and the Jin State is not much.

And the feces and urine can suppress combustion, as long as they withstand the offensive of the Jin army in the first ten days, the next days will be much better.

In the afternoon, the Malay newspaper reported that the forward of the Jin army was less than ten miles away from Yin Yangcheng, but in fact, it could be seen with the naked eye. At this time, Bailiyan was still organizing preparations for war in the city, and Zhao Xun led a group of people to the city wall, and they smelled a smell of that was disgusting.

"Wei Xian, how is the layout of the city defense."

"Back to General Zhao, in addition to the west of the city wall, the east, south, and north sides are hung with straw mats."

"Is there enough rolling wood and stone?"

"Even if it is sticking to it, there is naturally no sufficient use of military equipment, and the more the better."

"Well, that's a good point." Zhao Xun was quite satisfied, and then said: "You go to the enemy building with me, there will be a matter that has been decided, I want to know what you think." ”

"No!"

Follow Zhao Xun to the enemy tower, look northeast for a while, and then say:

"Sit."

"General Xie."

After he sat down, Zhao Xun said:

"General Ben is determined to sneak attack the Jin army tonight, what do you think?"

"This ......" Baili Yan said thoughtfully: "There are more than 20,000 pioneers of the Jin army, and there is still a day away from the Han He army, although the sneak attack is indispensable, but the cavalry of the Jin army is strong, and the vanguard does not see the cavalry accompanying him, so I suspect that Han Heding has already expected that our army may sneak attack him when its vanguard foothold is not stable, so it is very likely that the cavalry will wander nearby, if our army steals the camp at night, it may not only be exterminated, but even broken by the cavalry." ”

"Well, that's right, go on."

"Therefore, it is not advisable to attack the vanguard camp, but it is possible to rob and kill its cavalry."

"But a sneak attack at night, how to rob and kill cavalry. It is not easy to fight head-to-head in daytime foot combat, let alone at night. ”

"General Zhao, there is still a pit in the southeast of the prefect river."

Zhao Xun's eyes lit up when he heard the news:

"You mean, luring the cavalry into a pit while it is dark, and causing them to trample on themselves."

"Exactly, the Jin army must have scouts and scouts to wander around a few days ago, so after the Jin army's front army arrived, it was inevitable to survey this pit, and for a while I didn't know the intention of our army, and this pit was already very deep, and it was time-consuming and labor-intensive to fill, so most of the Jin army would not fill the pit. Since it is not filled, under the blind fire of the black light at night, the cavalry will definitely not be on guard against Yin Yang, if it is poured out of the nest through this pit, our army can not spend a soldier and kill the cavalry of the Jin army, and frustrate its spirit. ”

Because a few days ago in the southeast of the Fuhe River digging clay, was dug out of a big pit, if you can take advantage of the night, take advantage of the Jin army's paralysis carelessness, at night to lead the Jin cavalry to the pit, the Jin army went forward and fell down one after another, followed by falling, and then stepped on the front, and finally planted heels, responsible for covering the Jin army's forward, plotting that the cavalry of the Xian army stealing the camp can suffer.

And what is even more lacking in virtue is that such a big pit is clearly there, and the Jin army didn't know why for a while, and he didn't think that he could plant it at night, and this pit is said to be deep, and it is only a soil pit of two or three meters, and people can't die. But who would have thought that a large number of cavalry would fight here at night, and they were still unfamiliar with the place, so they went to the pit when they were chasing and killing.

So this is a conspiracy, put it in front of your eyes, so that you can see it, but you don't understand how it can be planted. Zhao Xun didn't mention the stealing of the camp, and even Bailiyan himself didn't expect it.