Zhao Bing was in a hurry, but the envoy who persuaded surrendered to return the revenge. Xuyi prefect was tough and refused to open the city to welcome the surrender. In the afternoon, Badu went to persuade him personally, but there was no result at the moment. He didn't say anything, and thought he should still be based on fighting. He opened the city map drawn by the scout and looked at it. Xuyi's city was destroyed by war and rebuilt repeatedly.

Zhao Bing knew that the closest large-scale reconstruction was during the Shaoxing period of this dynasty, and it had been a hundred years. He saw that the regulations of the city far exceeded the scale of a county seat at that time, slightly more than the regulations of the prefectures such as Hang and Run. According to the dangers of mountains and rivers, it was opposite to the Sizhou City on the other side, and it was in line with the status of a military city. At this time, the city was built by Zhang Jun, one of the four generals of Zhongxing. At that time, the war in the Jianghuai River was in a tight position, and the Song court appointed him to guard Xuyi. He set up a tent on the first mountain to climb high and look out over Sizhou. When he saw the dilapidated old city wall, because the war had been severely damaged, he decided to rebuild the Xuyi city wall.

The newly built city wall is twenty-seven miles round, facing mountains three sides and water one side. According to the terrain, the west side of the city stands along the Huai Bank, majestic and tall; the south, east and north side of the mountainside are steep and winding. The surrounding Shanggui Mountain, Taizi Mountain, Qingfeng Mountain, Dongshan, Ershan, and Xiangshan are all surrounded within the city wall. The first mountain, Fengpoling, Banbian Mountain, Cishi Mountain and the city streets are all in the city.

In order to ensure the solidity of the city wall, the base of the city wall is made of huge stones, lime and glutinous rice juice are used as adhesive, and then a rammed earth wall is built on the base of the stone wall. In places with valleys, drainage channels are reserved to prevent rain and water accumulation. Every other mile, a circular "fire tower" or an arc-shaped "horse face" is built. Because the city wall is built with rammed earth, it is impossible to use a rectangular horse face, so it is arc-shaped.

In Zhao Bing's view, it is very innovative. This kind of enemy platform is conducive to construction and ensuring sturdiness. Bluestone ridges are set up to transport soil, which is convenient for soil transportation and also forms a step-by-step attack and defense. You can also observe left and right to defend the enemy. You can also combine the horse face, flint platform, and whistle tower to see and observe the enemy situation, burn wolf smoke to inform the enemy situation, and also station troops for defense.

On the inside of the city wall, there is a "horseway" that is five to ten feet wide to adapt to mobile troop movements. Finally, the wall bricks are wrapped on the outside of the rammed earth city wall. From the outside, it is no different from the brick city. The wall along the Huai city wall is made of huge stones, and the walls are built with large bricks, with walls of more than three feet high. On Liangshan north of the Ershan Mountain, there is also a "horseway" and "ancient city wall" surrounding the entire mountain. It is more than five miles away. It is said that Gao Shi, a great poet of the Tang Dynasty, built the "long besiege city" built in the second year of Zhide when he was the governor of Huainan Jiejun to attack the Anshi rebels.

There are six city gates at the same time: the east gate is Xuanhua Gate, the west gate is called Ginmen, the south gate is called Danan Gate, the northwest gate is called Shuimen, also known as Yongbian Gate, Huaibian Gate, the northeast gate is called Cishi Gate, and the southwest gate is called Baoji Gate. There is also a small south gate in the west of Danan Gate. From the north gate from the northwest, all the mountains are steep and steep, approaching the Huai River, or facing the height, the shape is dangerous and solid. Looking down at Huai Si, it is in sight. Although there is no danger of blocking water, the slopes outside the city are each 10 or 20 ft or more than 30 ft wide, and the cliffs and rocks are unkempt, so you can't enter, and you can't jump, just like a natural danger. Only from the east gate is about three miles long, and the slopes outside the city are flat and wide.

After Shaoxing negotiated peace, the Song and Jin Dynasties "demarcated Huai as the boundary". Xuyi is located in Huainan, separated by the Huai River, which is Sizhou under the jurisdiction of the Jin Dynasty. Xuyi is at the forefront of the war between the Song and Jin Dynasties. At the same time, according to the "Shaoxing Peace Agreement", the Song Dynasty had to pay 200,000 taels of silver and 200,000 pieces of silk to the Jin Dynasty every year. Therefore, a "year-old coin warehouse" was built in Baoji Mountain in Xuyi to store silver and silk. After the Song Dynasty transported silver and silk to Xuyi, it was sent to Sizhou on the other side in the spring of the following year for payment.

Although the peace agreement was temporarily peaceful, the Jin Dynasty and the pseudo-Qi often sent troops to cross the river to invade, plunder border residents, and even captured Zhenzhou, Shanyang, Chuzhou and other places. Xuyi was often lost due to the attack of Jin soldiers, so he had to retreat to Tianchang to protect himself. The Song Dynasty launched Longxing and Kaixi's two northern expeditions, fighting with the Jin soldiers in Xuyi and Sizhou. Xuyi was in the Song Dynasty and was in the Jin state, and it was always in a state of war. The city defense facilities built by Zhang Jun were seriously damaged and it was difficult to play a role.

Later, the officials of Mu Shu were cautious in accordance with the provisions of the Jiading Peace Agreement and were not allowed to build cities on the border, increase troops and exercise, so that the city defense fortifications had long been abandoned. It was not until Ge Hongren Zhijun that the city defense was repaired again. However, the solid city in the later period still did not block the invasion of the Mongol Yuan. After falling into the enemy, the city defense in Xuyi City was not repaired again, but the main body was still intact. For the Song army, which lacked heavy weapons, it was still an insurmountable obstacle in the short term.

How to quickly conquer this strong city, Zhao Bing first launched a strong attack, and he could not bear huge casualties at all. Moreover, the city bases were built with giant stones. Not to mention the black gunpowder now, even TNTs in the future could not guarantee the successful explosion. The enemy defenders in the city knew that they had few soldiers and were reluctant to leave the city to fight. It was not easy to lure the enemy out and annihilate them. The remaining method was to do it.

It was difficult to accurately see the flaws of the city defense from the map, so Zhao Bing decided to take a trip himself. So he asked Tan Fei to lead a team of guards to sneak out of the camp and run away from the city. He rushed to the foot of the mountain in the east, abandoned his horse and walked up the mountain until the peak. He stopped until the peak. At this time, the sun was already west, and the Sizhou City on the other side was bathed in the sunset. The water of the Huai River rolling east was also reddened by the sunset, and the towering Xuyi City was under his feet.

Their location is very close to the city, and even with the naked eye, the figures of the enemy soldiers on the top of the city were clearly visible. Tan Fei was very nervous. If the enemy was discovered by the enemy and sent troops to encircle and suppress them from the city, they would likely be blocked on the mountain. In addition to setting up a warning post, they also sent surveillance posts to the city gate so that the enemy situation can be discovered in time and early warning.

"Tan Fei, if you were asked to defend the city with 4,000 troops, how would you arrange it?" Zhao Bing held the telescope and observed it carefully from a distance to near. After a while, he put it down. He raised his hand and pointed at the city and asked Tan Fei beside him.

"The Xuyi city wall is long, but the troops are insufficient. If the troops are equally divided, the troops will be insufficient to resist the enemy's heavy troops attack. However, the north side of the city is surrounded by a river, and the city is thick, and it is difficult to conquer without naval forces. There are mountains outside the other three sides, not only roads are difficult to move, but also troops are difficult to expand. Even if it is temporarily broken, the follow-up troops will be difficult to keep up, which is not enough to worry. Only outside the East Gate can Chen heavy troops be used to attack the city. Therefore, if the subordinates defend the city, they can only concentrate their forces, and the main force is arranged at the East Gate, leaving a small amount of troops as mobile forces. Set up guard posts in the rest of the places. If the enemy attacks in time, timely warnings will be made, and the mobile forces will be mobilized to drive the enemy!" Tan Fei thought for a moment.

"If I defend the city, I will concentrate my troops in the long encirclement of the city. In this way, a small amount of troops can be used to defend the dangerous land for a long time, consuming the strength of the enemy. When reinforcements arrive, they can turn the tables immediately. Instead of gradually exhausting the troops on the top of the city, they will eventually burn them all." Zhao Bing said.

"I'm afraid that there are few people in the world who are as brave as Your Majesty dare to abandon the high city and deep moats, and only defend the dangerous land." Tan Fei was stunned when he heard this, and immediately understood that if he gave up the long front line when there was insufficient troops and chose to defend the dangerous land, he could do ten, and exert his limited force to maximize his combat power, so that the enemy could not fully control the city. But he also knew that even if someone thought about it, no one dared to do this, because it seemed too risky, and replied with a wry smile.

"Fortunately, they dare not take risks and survive in death, otherwise we would have to sigh and do nothing!" Zhao Bing said.

"In this way, Your Majesty wants to use a partial army to attack, mobilize the enemy's troops, and then use the main force to break the city?" Tan Fei asked.

"I ask you again, if you are an ordinary soldier in the city, what is your mood at this moment?" Zhao Bing did not answer, but asked back.

"If the subordinates are a soldier in the city, they want the enemy to conquer Yangzhou City and defeat tens of thousands of troops in a row. In addition, the disparity in the forces between the two sides, they will naturally be frightened and frightened to guard the lonely city with a group of mobs." Tan Fei thought about it and replied.

"The frightened bird! This metaphor is appropriate. What would they do if we fired an arrow at night?" Zhao Bing asked again.

"Of course, it's like a bird or a beast scattering, and I'm eager to run!" Tan Fei replied without hesitation. He seemed to have thought of something, but he couldn't catch the flash of inspiration.

"I think this high city and deep moat is unattainable for ordinary people, but it is not insurmountable for those who are good at climbing!" Zhao Bing said with a smile.

"I understand. I just need to select an elite soldier, sneak into the city at night, and then create chaos, and then seize the city gates in the chaos, and let the army enter the city!" Tan Fei finally figured it out and said excitedly. He knew that there were many talented people in the guard camp. It was easy for them to sneak across the city wall. It was impossible to seize the city, but creating some chaos was a piece of cake.

"Not bad! The spies sneaking into the city of the Bureau of Affairs have already heard from them. They are ready to receive the army into the city. Once we receive our signal, they will cooperate with the action to create chaos in the city, trigger riots, and cover our actions." Zhao Bing only expressed his plan at this time.

Then Zhao Bing went close to reconnaissance again, looking for weak points that facilitate city defense and hidden and convenient climbing places, and marked them one by one on the map, and quietly returned to the camp after dark. Before they could sit down, Badu came to ask for a meeting. Zhao Bing saw his face and knew that the outcome of the negotiation was not good. After asking, no surprises occurred, the other party refused to surrender, and scolded Badu, which made him feel very depressed. He still breathed a sigh of relief, and felt that it was a disgrace to not complete the task.
Chapter completed!