Li Laoer's advantage is that his cavalry was all elite cavalry wearing thick armor, one man and two horses, and holding armor-breaking heavy weapons.

"The commander, Huang Taiji's invasion was to plunder the population and rob food and property, not really to attack the capital. They were originally thinking of leaving with the idea of ​​robbing Huang Taiji! In view of Huang Taiji's characteristics, we should be firm in the walls and clear the fields! Taking advantage of Zunhua City's time advantage to temporarily hold Huang Taiji back, let all the villagers in nearby villages escape and hide in the city. In this way, Huang Taiji would not be able to rob food." Li Laoer pointed out the way to deal with the Later Jin army.

"Maybe Zunhua can't last for a few days. Once Zunhua is lost, Jiannu will come here soon. We have no time to notify all the people in the entire Jingji area." Sun Chengzong lamented.

Li Laoer said: "The subordinates all have one man and two horses and cavalry under their command. They can be divided into pieces and inform the people separately. Supervisors, we will let the nearby people enter Tongzhou City as much as possible."

"Tongzhou is just a small city after all, and I'm afraid it can't tolerate the surrounding people."

"City defense can be expanded and fortifications can be built outside Tongzhou city, so that an additional group of people can be taken in."

"Go out of the city to build fortifications?" Sun Chengzong was stunned.

"Can you use the paper and pen of the supervisor? The subordinate wants to draw a map of the city defense fortifications." Li Laoer pointed to the four treasures of the study on the table.

Sun Chengzong smiled and said, "Just use it."

Li Laoer thanked him, took out a piece of paper from the table, ground ink on the inkstone, then picked up a pen and drew the defense drawings outside the city on the paper. Sun Chengzong looked at the drawings drawn by Li Laoer curiously, and saw three trenches on the drawings. There were a low wall behind each trenches, and a wooden fence was tied on the low wall. In addition, Li Laoer also drew a floor plan, and there were deliberately left channels between the trenches and trenches, and artillery was arranged at the end of the passage.

After the drawing was finished, Li Laoer said: "Secretary observes that there are many guards in Tongzhou City, and there are a large number of bird guns and rockets. We dug three trenches that are one meter wide and three feet deep outside the city. Five-foot-high sheep and horse walls are piled up behind the sheep and horse walls. The lances and bird gun soldiers are placed behind the wooden fences. If Jiannu attacks, he will definitely use a shield chariot to approach the sheep and horse walls, but the trenches will block the Jiannu shield chariot. At that time, the cannons arranged at the top of the city can bombard the Jiannu shield chariot."

"After the three trenches, a hundred steps of open space is reserved between the city walls to accommodate villagers, so that Tongzhou City can accommodate more people from the Ming Dynasty and protect the people from being robbed by Jiannu."

Sun Chengzong asked: "What is the purpose of the passage specially set up between the sheep and horse walls in the trenches?"

Li Laoer said: "These passages were deliberately left for Jiannu to walk! As long as Jiannu enters the narrow passage, the cannons arranged at the end of the passage can work! One shot is blasted out, and the shells are bounced back and forth on the wall of the passage, which is enough to penetrate the front and back of the Jiannu formation! One shot is blasted out, and dozens or even hundreds of Jiannu people can be killed!"

Those passages are digging traffic trenches in the middle, allowing their soldiers to shuttle between the front and rear trenches, and pile up the dug out of the ditches into walls on both sides of the traffic trenches. In this way, once the Jin army enters the passage, the general artillery and red artillery cannons arranged at the end of the passage are fired with one shot. The shells can cause greater damage to the Jin army in a narrow space!

In an open ground, after the shell lands, it bounces irregularly. When hitting a person, the shell will also change its movement trajectory. However, tying the shell with a narrow passage can allow the shell to form a front-and-back killing effect on the formation of the Later Jin army.

In addition, there are many rockets in Tongzhou City. Although the swarm of rockets of the Daming Shenji Camp are very accurate, they have a good killing effect on dense formations.

Although the range and accuracy of the Folang cannons in Tongzhou City are poor due to serious air leakage, the Folang cannons are loaded quickly and can fire cannons quickly, killing the Jin army in the siege.

The positions arranged by Li Laoer, various cannons, muskets and rockets, formed cross-fire power, fired from both wings, and could form cross-fire strikes on the enemy in the middle, leaving the enemy with nowhere to escape.

"Li Shoujie is indeed a talent!" Sun Chengzong sighed, "The fortifications I built in Liaodong are far from enough than your simple defensive position!"

"Supervisors, we need to seize the time to send the people into Tongzhou City. These people can help us build trenches and fortifications together. As for the food issue, the people can bring their own food into the city. Even if the food carried by the people is eaten, it doesn't matter. Tongzhou is at the intersection of the North Canal and the Yongding River. It has convenient transportation and a lot of food is stored in the city. Even if Jiannu besieged us for half a year, Tongzhou will not be able to eat up the food in Tongzhou. They cannot be besieged us for half a year. If they besieged us for half a year, they may be exhausted."

"According to what Li Shouji said, Jiannu's invasion was to rob people, property, and he would run away if he robbed him. Since we had a strict defense, why did Jiannu attack us again?" asked Sun Chengzong.

"As the commander, as long as we strengthen the walls and clear the fields and send all the people into Tongzhou City, Jiannu cannot rob the population and food, he can only attack Tongzhou. In addition, the lower officials will personally lead the brothers to break the pieces and follow the harassed Jiannu. If he meets a small group of Jiannu robbed the village, the lower officials' cavalry will immediately turn into pieces and eat the gang of Jiannu. If Jiannu sees that our army is broken into pieces and also turns into pieces to try to disperse our army, then our army will turn into pieces and eat Jiannu in batches."

"It's easy to say that it's really easy to implement, if it's really difficult, the team has already dispersed. How do you contact the team and issue a gathering order?"

The communication back then was backward and there was no radio. It was indeed not easy to command the troops scattered around the world to assemble. In this regard, Li Laoer had already made a countermeasure: "Cabinets of various units carried fireworks and rockets, and raised the fireworks signal code to set the fireworks signal. Only our people knew which fireworks signals represent what. When they saw the signal, they would naturally assemble in a certain place according to the signal prompts and attacked in which direction. These things have been practiced by the officials and brothers when they were outside the border."

Sun Chengzong nodded: "Okay, then we will act immediately. I will send you out of the city and bring the people around you back to the city."

After receiving the order from Sun Chengzong, You Dai immediately led 3,000 Ming cavalry out of the city and went to various surrounding villages, and advised local villagers to leave the village and go to Tongzhou.

Just when Li Laoer assisted Sun Chengzong in the arrangement, the Jin army had not yet conquered Zunhua City. Because the spies in the Later Jin city had long been caught in one go, it was difficult for the Jin army, which lacked cannons, to conquer Zunhua without internal support.
Chapter completed!