"President Pan is really naughty!" After Zhao Bing, who was watching the battle in the mountains, saw that the attack in the south gate was blocked, the six armies immediately stopped attacking and retreated to the starting position. At the same time, they used mortars arranged on the front to bombard the enemy on the city. After two repetitions, they caused great casualties to the enemy on the city. But even if the Song army attacked again, they did not dare to ignore it. What if this time was true? After teasing several times, the enemy on the city did not dare to counterattack wantonly. After all, the arrows shot down could not be picked up, and they were just careful to monitor and were ready to go, which made them very depressed!

"General Pan is also an interesting person. In this way, the enemy will be negligent and create an opportunity for our army to attack the city!" Xu Wunan also smiled.

"He has many ideas, not only to lure the enemy into paralysis, but also to brew a bigger offensive!" Zhao Bing chuckled.

"Oh?!" Xu Wunan couldn't think of any mystery, and the emperor did not point it out, so he could only watch the changes.

Zhao Bing understood that the body-barrel cannons he equipped had a huge defect. Nowadays, the cannons are loaded in front, using shellless shells, and the launching medicine bags and shells are loaded in two times. Therefore, after each launch, you need to use a gun brush to dip water to clean the barrel. One is to clean the gunpowder residue after the fire; the other is to extinguish the unburned gunpowder; and the other is to cool down.

Because the ignition point of black gunpowder is very low, the purpose of these measures is to prevent the ignition of the launching medicine during secondary filling, causing the cannon to explode. However, after multiple rounds of launch, these measures still cannot reduce the temperature of the cannon, so they have to stop firing and reduce the temperature of the cannon. Pan Nian is familiar with this disadvantage of artillery, so he took the opportunity to trick the enemy during the waiting time.

Press this side to show. At this time, the direction of Xicheng seemed to be lukewarm. After the first round of artillery fire was prepared, the city's defense measures had been destroyed, and several floating bridges were built. Under the cover of artillery fire, several rounds of impact were launched, but they were all repelled halfway through the attack. Now we have gathered our troops again and launched a strong attack under the cover of artillery fire.

"The cloud ladder is up!" Xu Wunan was also attracted by the war here. The assault battalion of the Seventh Army divided into several routes to the city, and the enemy troops on the city were suppressed by artillery fire and lacked enough troops. Although he tried desperately to push the cloud ladder, he was unable to take care of both of them for a while, which made the Song army successfully erect the cloud ladder, which made him shout with great excitement.

"Well!" Seeing that the assault camp had begun to organize the city, Zhao Bing was not at all happy. He knew that the Mongolian Yuan was no longer the barbarians who only knew how to ride horses and bend their bows. They had learned to siege and defend the city in the battle world. In addition, they absorbed a lot of conquered troops in this process, especially after the Jin army and the Southern Song army, the technology of defending the city had been greatly improved. It was impossible to just join the Song army to climb the city so easily.

After the assault camp began to climb the city, in order to avoid accidental injuries, artillery extended forward and fired into the city to prevent enemy reinforcements. At this time, several secret doors suddenly appeared on the city wall, and some of them rushed out. Some of them destroyed the ladder, and some of them fought to fight. The two sides immediately fought together. The enemy continued to rush out from the secret door, and the Song army also increased troops under the city through the floating bridge.

Zhao Bing felt nervous when he saw this. As a defensive building for cities, cities and castles, the city walls are mainly composed of walls, women's walls, battlements, city towers, corner towers, city gates and urns. However, in addition to the main gate, side gate and water gate, in order to prevent it from being difficult to leave the city after being besieged, secret doors will be opened in advance on the city walls or walls, which are used to send people out of the city to collect wood, draw water, and smuggle supplies. At the same time, it also facilitates troops to go out of the city to reconnaise and raid the enemy, so some are also called raid gates.

According to regulations, a bumper door will be set up every 100 steps in the city wall. The bumper door will generally be dug from the inside of the city wall to the outside, and the part left outside will not be dug through. When it is necessary to attack, it will be pushed temporarily, and suddenly attack will be made, and the opponent will not rub your hands. Because the location of the bumper door is related to the safety of the city, it is top secret where it is opened, and it will be covered up on weekdays, and it will even be rebuilt. It is difficult to obtain a specific location in advance, making it difficult to guard against it.

"Oh no!" The space under the city is designed very small, which makes it difficult for the siege party to gain a foothold, so although it will receive reinforcements, it cannot be launched. The two sides fought together and could not launch artillery bombardment. Even if they could repel the enemy's surprise attack, it would also allow them to get on reinforcements to the city. In this way, it would be difficult to get into the city again.

"Master Xu, I think this is an opportunity. As long as we seize the secret gate, can't we go straight into the city and open the city gate to help the army enter the city!" Ma Duanlin next to him felt that this was a good opportunity to seize the city and waved his hand.

"Master Ma, that's almost impossible!" Xu Wunan shook his head and smiled bitterly.

"Why?" Ma Duanlin said in confusion.

"This..." Xu Wunan frowned. The war was in urgent need of his time. He didn't want to distract himself to explain. But Ma Duanlin was also the head of the same room, and he couldn't refuse. Thinking about it, "Ma Zheng, the outside of the city wall seems straight, but in fact, there is another world inside, especially the border guards, which is even more so. A big city like Xiangyang must have another arrangement in the walls, which is definitely not what you see in front of you."

"Oh, I'd like to listen to the details!" Ma Duan leaned forward and said.

Xu Wunang heard it and complained in his heart. He wanted to give it a few perfunctory words, but he didn't expect that his desire for knowledge was so strong. But he could only say: "There will be some secret doors on the city wall at the beginning of construction. The door openings may be opened on the inside of the city wall and lead to the top of the wall; or through the wall to communicate with the inside and outside of the wall; there are also some that are opened on the outside of the wall and lead to the top of the wall. The door that only opens on the inside of the city wall and leads to the top of the wall is called "City Gate", or is located next to the enemy platform or in the middle of a longer section of the wall. It is built to facilitate the defense of the city and the upper and lower walls of the guest soldiers. This type of door is generally small in scale. If the wider is in parallel, two people can only be allowed to pass by alone."

"In addition, there are also smaller sizes, mostly hidden doors. Unlike the above two categories, this type of door is generally small in scale and only allows single people to pass through; non-traditional routes for people passing through, and the location is hidden and difficult to find; there are also hidden doors that open on the outside of the wall and lead to the top of the wall. From a defensive perspective, opening the door on one side of the enemy is simply a death-sending move. However, those who are well versed in the way of defense understand the reason. Such secret doors are generally small in scale and the shape is simplest. Without guidance, they cannot be discovered."

"Of course, in case of things, in order to prevent the secret door from being exposed, there will be mechanisms to block the enemy's entry. The "Mozi·Motu" chapter records that a tile-shaped stove should be built in each tile-kiln-shaped stove, and the stove should be built four or five feet inside the door. The tiles on the tile can allow rainwater to flow into the door, and a military officer will be arranged to block the tile-shaped door. The method is: tie two wheels with wood, apply mud on it, and hang them in the tile-shaped door with ropes. According to the width and narrowness of the door, the wheels should be hung four or five feet in the door. Set up a kiln stove, and then install a leather bellows next to the door, and the stove is filled with firewood and mugwort leaves. When the enemy attacks in, they put down the wheels to block them, ignite the firewood in the stove, activate the bellows, and smoke and fire to roast the enemy invading."

"It turns out that there are so many twists and turns in it, I'm talking nonsense!" Ma Duanlin understood and bowed his hand.

"I dare not, it's my squad who is showing off!" Xu Wunan quickly returned the favor and ended the conversation, and said to His Majesty, "It's no longer possible. If you continue to fight, you will only increase casualties. Will you want General Wu to withdraw?"

"We only watch the battle, don't say much. They will decide everything. Don't interfere with the determination of the front-line commander!" Zhao Bing turned his face and glared at him.

"Yes, my subordinates know their mistakes!" Xu Wunan naturally knew that his Majesty had granted them the right to make an opportunity before the war, and said that he did not need to ask for instructions in everything and could fight according to their ideas. And his suggestion was a taboo, which might disrupt the deployment and attack rhythm, leading to delays in the war, and even failures.

While the Ximen and the two sides were fighting for control of the city, the South Gate also launched an attack. The enemy in the South City was teased several times and learned his lessons, but he did not show off his eagle. And what Pan Nian wanted was this, and he grabbed the empty space of the city and sent troops across the river to erect a ladder. The enemy was unable to mobilize troops. After a fierce battle, the Song army successfully climbed to the top of the city.

Zhao Bing's eyes were attracted to Nancheng again. He understood that climbing to the city does not mean controlling the city wall, but this is also a node that affects the situation of the war, and the key to success is one word - fast. The soldiers in the upper city must quickly consolidate the breakthrough and gain a foothold; and the troops under the city must also quickly climb the city to reinforce, assist the commandos that first climb the city to establish a solid bridgehead and meet the subsequent troops to the city.

The follow-up troops should also move quickly. They must quickly assemble troops to reinforce and send the troops to the city through the breakthrough point, compete with the enemy for control of the city wall, and repel the enemy until they seize the city gate and allow the army to enter the city. These three links are linked together, and as long as one fails, it is difficult to succeed.

In this regard, the enemy has obvious advantages. The enemy troops hidden in the hidden military cave can quickly climb the city through the climbing road hidden inside the city wall, and the enemy troops under the city can also go up the city from the horse road and the stairway. The city wall can also be regarded as the outer ring road of the city. The enemy soldiers from other places can also avoid the blockage of artillery attacks, use the city wall to quickly climb the city, reinforce along the city wall, and attack the Song army in the city.
Chapter completed!