In the southeast of Tongwancheng, a new tent was set up at the corner of Wuding River and Heishui River.

The terrain taken by this tent is extremely clever. It is backed by the angle between the two rivers and facing Tongwan Jiancheng. On the side of the city, a long moat was dug and sandbags were built. After more than ten days of intense construction, the long moats in the besieged city changed a little more. Near the east and south of Tongwan City, the trenches on the south sides were deepened and widened. The chest wall built with sandbags behind the trenches became tall and wide, and many side rows were also set up on the top of the chest wall.

The trenches on the northwest side of Tongwancheng are still perfunctory, narrow and shallow, and at first glance they are a tofu project that cuts corners.

In addition, at the junction of the southern and western sections of Changhao, as well as the junction of the eastern and northern sections of Changhao, two circular fortresses made of sandbags, called "South Fort" and "East Fort". Although the fortress is not large, it has become two support points that can cover the flanks of the two southeast sections of Changhao.

And under the protection of the two forts in the southeast, the two sections of Changmo, Heishui River and Wuding River, is the camp of the 25,000 troops of Wuhaogu.

Because there were no trees, Wu Haogu's camp did not set up camp bars or horse-rejecting horses, but used sandbags to build a protective wall. The "Tree of the Skip" (also cut down) that was finally found was used to build a tall viewing building, standing in the center of the camp.

Military opportunity, the former Knight of the Imperial Class, Li Yongqi, took a bronze-skinned telescope and climbed up along the wooden ladder of the building. On the roof of the building, the two soldiers under the command of the building were smart and clever, literate and literate. The younger soldiers were all from Jiehe Shang City, most of whom were from the Wu family, and the children of the Ximen family or customers (tenants) had arrived. Seeing Li Yongqi climbing up, they bowed their hands.

Li Yongqi nodded, "Can the flag be carried? Can the tripod be prepared?"

"Reporting the opportunity has been prepared."

One of the soldiers answered and took out three triangular flags, red, yellow and green, respectively, while the other soldier supported a tripod.

The small flag is used to transmit signals. The Jiehe Knights' School and the Shipbuilding School compiled a simple set of flag languages ​​based on Wu Haogu's commands and prompts. The tripod was designed by Wu Haogu based on the later triangular easels. It can be used for drawings or to set up a telescope.

The telescope is the long tube made of leather rolled by Li Yongqi's back. The two sections of the long tube have a crystal-ground convex lens each. It was easy for the telescope to invented by the Song Dynasty, because the people of the Song Dynasty would have used crystal-ground convex lenses as magnifying glasses or glasses.

Wu Haogu only needs to find two convex lenses and a long cylinder to make a simple telescope. However, the things you can see through this telescope are upside down and left and right... This is because grinding a concave lens is more difficult than a convex lens, after all, no one has ever worn it. Moreover, the crystal is not glass, not only expensive, but also less output. Grinding two lenses at the same time is not conducive to lens exchange.

Therefore, with military opportunities like Li Yongqi, he had to endure an upside-down world.

However, compared to taking turns to climbing the tower and watching an upside-down and enlarged world with a strange telescope, what makes military opportunities even more trouble is that they have to face a lot of copywriting work every day.

For example, you have to write various "Battlefield Logs" and "Train Logs" every day, and you have to be responsible for drawing a large number of maps, including topographic maps, defense maps, etc. You have to formulate very trivial "Fighting Formation Strategies" at all levels, and supervise the implementation of troops at all levels. Finally, you have to summarize the battle formations and write them into text for archive.

Moreover, based on various "logs", "strategy" and "summary", military command is constantly improving a series of regulations and regulations that guide troops' combat training, called "Infantry Regulations", "Cavalent Regulations", "Engineering Regulations", "Baggage Regulations", and "Staff Command Regulations".

This set of things is natural to later generations, but for soldiers of the Northern Song Dynasty like Li Yongqi, the entire thinking method has to be completely changed. Because this set of methods that have been improved through repeated practice and meticulous observation is the application of positivism in military science.

Various logs and strategies are actually to infer or understand experience through direct or indirect feelings. Various regulations are summaries of these experiences and inferred hypotheses that have not yet been verified. These hypotheses can be verified through practice!

This is a method of making progress and knowledge, which can be used not only in natural sciences, but also in the development of military and various social systems.

Don’t underestimate the impact of these thinking methods that are natural for future generations on the Song people. In the Northern Song Dynasty, the Chinese people’s thinking was relatively dogmatic, and they valued the things written by the sages in books. Writing books is even a sacred thing. No matter how great scholars or old military strategists are qualified to write military books. Young officers like Li Yongqi can now participate in the writing of various regulations with extremely high value in actual combat, which is really incredible to them.

But the order is the order! Li Yongqi doesn't understand it, and he has to complete it without hesitation. Every day, he has to record as meticulously as possible on his own camp, enemy cities, and everything he can see from afar.

If there is any abnormality, you must report it in time through the flag language!

After placing the recording book and pencil he brought with him on a small wooden table, Li Yongqi placed the telescope on a turntable on the wooden rack, and then tied it tightly with a leather rope. Then he began to observe... The observation was in sequence, following the cycle of "four sides - enemy camps (city) - one side trenches - one side camps - four sides". Every time he looked at a place, he had to inform him of any abnormalities. The soldier who was responsible for setting up a tripod was also a recorder, and would record the situation reported by Li Yongqi on the notebook one by one.

"north……"

Li Yongqi first turned the telescope to the north, and the dizzy inverted image appeared in the eyepiece. The sky was below and the ground was above. There was a layer of gray smoke and dust floating in the middle, with a sharp head, which showed a continuous diffuse shape backwards.

This is?

Li Yongqi's head buzzed and became nervous. This was a squad of cavalry moving in! Judging from the scale of smoke and dust, there were at least 10,000 horses (actually far exceeding, but Li Yongqi didn't know how to judge the number of enemies through the smoke and dust in the telescope), and was bypassing dozens of miles north of Tongwan City!

"Enemy! Western thief! About 50 miles away, smoke and dust were visible. It was located north, with about 10,000 horses, and was moving west quickly! No, no, it was moving east! They were moving east!"

With his roar, the soldier holding the triangle signal flag desperately waved the red and green flags in his hands, and sent his report to the central tent of the Sanzhi Army as fast as possible.

“10,000 horses 50 miles away are heading east?”

"The Western Pirates want to fight the Stone City?"

"Impossible... There is a general from the Hedong Army in Shicheng. How can the Western thieves be attacked at most more than 10,000 Western thieves?"

"It must be that I want to cut off our food route?"

In the central army's tent, the left-behind military affairs were sending people to Wu Haogu, Gao Qiu, Tong Guan and Zhao Zhongge to inform him, while discussing them.

After a while, Wu Haogu, Gao Qiu, Tong Guan and Zhao Zhong brother rushed from their resting camps in a hurry.

"What's going on?"

Wu Haogu was the most nervous among the four people, and he asked as soon as he entered the big tent.

"Report to the Du Yuhou," a young man named Liu Bin, who had a short figure but had a big brain and bright eyes, replied, "The observation deck reported that a large amount of smoke and dust was found 50 miles north of the north. It was judged that Western thieves were passing by, with about 10,000 horses."

Tong Guan interrupted and asked: "Is it ten thousand horses and ten thousand cavalry?"

"It is not certain yet," said Liu Bin. "The distance is too far, and only smoke and dust can be seen on the watchtower, and there is no way to judge."

"Where is the detective cavalry?" Tong Guan asked, "Have you put it 50 miles away?"

"I've been put on 30 miles," said Zhao Zhongge, "but they should be able to find a situation that is 50 miles away, and there will be rewards in a while."

Rangers are not meant to be more farther away, especially the better. The cavalry released often hunts enemy rangers, which requires forming a larger ranger team, usually 50 to 100 (including auxiliary cavalry). The cavalry, including auxiliary cavalry, has more than 3,000 people, and they are dispatched in turn, and they have to block and guard in all directions. Naturally, it is impossible to open the net too large.

Wu Haogu walked to the front of the map platform with his arms in his arms, and the approximate location of the Western Pirate Cavalry who had just been discovered was marked with a small wooden sign.

Obviously, this cavalry was deliberately avoiding the three elite troops surrounding Tongwancheng!

"Where do they want to go?" Wu Haogu asked.

"It should be between Tongwan and Shicheng." Tong Guan gave the seemingly most reasonable answer.

"Break our food route?" Gao Qiu asked.

"It's probably true," Tong Guan smiled, "There are only ten thousand people up to the sky. Can you still conquer Shicheng?"

"Master, Dalang," Gao Qiu smiled at Wu Haogu, "It's better for me to take the cavalry and defeat these ten thousand Western thieves!"

Tong Guan nodded, "Dalang, what do you think?"

Now the command authority of the Sanzhi Imperial Army is quite strange. To outsiders, it seems that Tong Guan and Gao Qiu have the final say. Tong Guan is the sacrificial commander, while Gao Qiu is an international general who "brings" the elites of Sanzhi. In contrast, Wu Haogu is just a businessman who can't fight. How could the people below listen to him?

But in fact, through military command, knights, Jiehe cavalry, two engineers and one baggage soldier command, Wu Haogu firmly grasped the command of the Three Direct Imperial Guards.
Chapter completed!