After Xue Shisan finished talking about Song Taizong's construction of the Great Wall of Water under the suggestion of He Chengju, the envoy of the Six Mansions, Zheng Shuang picked up and said: "Grandpa, you are right, He Chengju is indeed a talent; He couldn't help but suggest that Song Taizong build the Great Wall of Water, and also built an underground passage along the border; The underground passage and the Great Wall of Water go hand in hand, forming two strong military defense lines; The Great Wall of Water blocked the Liao army from being abused by the Tielin army, and the Song army ambushed in the underground passage was haunted and attacked the enemy by surprise; So that the Liao army is at a loss! ”

Zheng Shuang originally wanted to say: He Chengju took the lead in building tunnels, when the Japanese invaded China in the 20th century; The common people of the Jizhong Plain built the tunnels dotted around, firmly fixed the invincible little devils in the rear, and strongly supported the battle of the large corps on the front line.

However, the words came to his lips and swallowed back, glanced at Xue Shisan, and said, "Grandpa, the next Great Wall of Water and tunnels will be taken by Xiao Ke to talk about it!" ”

Zheng Shuang said to lift his spirits, and he waved his arms as if he had gone to the lecture hall; It tells about the Great Wall of Water and the underground passage built by Hebei East Road, Hebei West Road, and Hedong Road close to the first line of Yanyun Sixteen Prefectures.

Facts have proved that in Song Taizong's various unreliable military choices throughout his life; The excavation of the Great Wall of Water and the underground passage are rare and reliable, and they also leave valuable defense classics for future generations.

The excavation of the Great Wall of Water resisted the Liao Iron Cavalry, which was the most efficient recuperation for the Song army, which had been fighting economically weak and suffering heavy casualties for many years.

As early as the Han-Hungarian War, Emperor Wu of the Han Dynasty had the strategic idea of transforming the Yellow River to replace the Great Wall and resist the Xiongnu cavalry. However, the construction technology of the Han Dynasty was too low, and it was difficult to realize the grand idea, so I had to give up.

During the Three Kingdoms, Sun Quan once built a pond in Liuhe, Jiangsu Province with a scale of 100,000 troops, and successfully withstood the impact of the Wei Iron Cavalry; It is a classic template for the strategy of the Great Wall of Water.

The Great Wall project started in the Northern Song Dynasty far exceeded that of its predecessors, not only was the amount of work much larger; It is even more time-critical and heavy-tasked.

Zheng Shuang said this, looked around, and saw that Emperor Zhenzong and the civil and military ministers of the Manchu Dynasty were listening to his words, and he felt happy in his heart; Looking at Xue Shisan, he suddenly said: "Grandpa was the commander of the palace at that time, why did he go to build the Great Wall of Water?" ”

Xue Shisan was startled, and immediately came back to his senses and said excitedly: "The commander in front of the palace is a second-class member of the imperial court, and he is a forbidden army of the imperial court guarding the emperor; However, to build a grand project such as the Great Wall of Water in a very short period of time, gongs and drums are in unison; The emperor gave an order to reduce the guards around him and let the old ministers lead them; Rush to Hebei to build the front line of the Great Wall of Water! ”

After a pause, he swallowed his throat and said: "Repairing the Great Wall of Water is no different from repairing drought, and the big guy can only sleep in the tent built with tarpaulin at night, mosquito bites, bed bug bites; I couldn't sleep at night at first; The next day, I had to dig the river mud in an unknown day, and the degree of hardship can be imagined; Later, when it became a habit, I didn't care, not that I didn't care, but the soldiers thought in their hearts: the ravages of mosquitoes, bed bugs and the iron hooves of the Liao army are nothing! ”

Zheng Shuang was a little excited, and empathized with tears in his eyes: "I am afraid that this is the indomitable and indomitable will of the Chinese people in the face of foreign places; It is under the inspiration of this strong belief in protecting the family and defending the country that the Chinese nation can be inherited from generation to generation! ”

Zheng Shuang was moved for a while, and couldn't help asking: "The mosquitoes and bedbugs on the river repair site are so arrogant, why don't grandpa use mosquito nets!" ”

Zheng Shuang asked a very naïve question: "Grandpa is a second-class member of the imperial court, and there are a lot of followers; It's not easy to put up a mosquito net to keep mosquitoes and bed bugs at bay! ”

Xue Shisan laughed heartily, pointed his finger at Zheng Shuang and said, "Zheng Zi, you are really funny, it's right that the old man is a second-grade master; It's also very simple to hang a mosquito net, but where is the more than 100,000 troops supporting more than 100,000 mosquito nets? The key to being an official is blindly special, and the sergeant can still dig river mud with peace of mind; Therefore, the old man must share weal and woe with the sergeants, which is also called the unity of the officers and soldiers! ”

Zheng Shuang was dumbfounded, he only knew that the army of later generations practiced the same officers and soldiers; But I didn't expect that the Song Dynasty would have the same words and sentences of officers and soldiers!

Not only the Great Song Dynasty, but also Wei Yan during the Three Kingdoms was a model of consistent officers and soldiers; Wei Yan has an arrogant psychology towards his superiors. But to the soldiers, that is concerned remarks.

Liu Bei asked Wei Yan to be the Taishou of Hanzhong, and he and the soldiers fought together in various passes and fortresses around Hanzhong to leave heavy troops to resist foreign enemies.

If the enemy came to invade Hanzhong, it could be blocked from entering the pass, and it could not pose a threat to Chengdu, the center of the Shu Han regime.

After Wei Yan and Wang Ping died, Jiang Wei adopted a completely different strategy of death to defend Hanzhong.

Jiang Wei felt that it was a waste of manpower and material resources to scatter a large number of troops in the pass fortresses around Hanzhong, so he withdrew all his troops to Hanzhong.

In Jiang Wei's opinion, although Wei Yan's method is in line with the "heavy gate" of "Zhou Yi", he can resist the enemy, but he cannot obtain great results.

In order to expand the results of the battle, Jiang Wei thought that it was better to let the enemy army enter Yangping Pass; The Shu army retreated to the two cities of Han and Le.

If the Wei army attacked, Jiang Wei thought that this method would lengthen the enemy's supply line; Prompting the other party to be unable to get the replenishment of grain and grass on the spot, and if the enemy army is tired for a long time, the Shu army will be able to wipe out the enemy.

But it's one thing to envision, it's another thing to change; After Sima Zhao mastered Cao Wei's army, he sent a multi-way army to attack Hanzhong, but at that time, Jiang Wei arranged all his troops in Huzhong, and was finally restrained by Deng Ai; The main force of the Wei army went directly to attack Hanzhong.

Due to the relatively small number of troops in Hanzhong, there was a large gap between them and the Wei army in terms of strength; So it was broken without waiting for Jiang Wei to come to the rescue.

Hanzhong, which Wei Yan and Wang Ping had long held, was soon lost in the hands of Jiang Wei, and Hanzhong was the gateway to Chengdu; It is an inevitable fact that Hanzhong lost Shu and Han perished.

Zheng Shuang's thoughts interjected Wei Yan and Jiang Wei, two Shu generals, to ponder for a moment, and then looked at Xue Shisan: "Grandpa and the soldiers share weal and woe with the spirit of praise, but let mosquitoes suck blood like that at night?" ”

"Not really!" Xue Shisanqi Yuxuan said: "Later, the soldiers picked mugwort and burned around the tent all night, and there were far fewer small bites!" ”

"Smoking mosquitoes is also a solution!" Zheng Shuang asked again: "How was your life at that time?" ”

"Each person has two bar buns and a bowl of gnocchi soup!" Xue Shisan said solemnly: "Without vegetables, you can only eat meat once a month, and life is very hard!" ”

Zheng Shuang blinked his eyes and said, "How long is the Great Wall of Water?" ”

Xue Shisan fixed the god and said: "If it is a straight line distance, it should be more than 300 miles, from Baozhou (Baoding) to Jizhou (Tianjin) into the Bohai Sea; However, if you count the Juma River, Hulu River, Hutuo River, Baiyangdian Lake, and the artificially excavated Caoqu Canal, etc., the entire Great Wall of Water is more than 1,000 miles! ”

"That's a long time!" Zheng Shuang exclaimed in surprise and frowned and said: "Grandpa is a personal experience of the Great Wall of Water, and the information you said about the Great Wall of Water is exactly the same as that of the kid!" ”

Zheng Shuang said, clearing his throat and calming down; Then the story of the Great Wall of Water will continue.

The engineering science and technology of the Northern Song Dynasty has developed by leaps and bounds, and after He Chengju, the chief designer appointed by the emperor, came up with the design plan, the elite forbidden army from all walks of life was dispatched; In less than a year, an above-ground canal with a length of more than 300 miles and a depth of two meters was dug - the Great Wall of Water.

The grand scene of the Great Wall of Water is completely comparable to that of the Great Wall of the Han Dynasty: a 300-mile river stretches across the Song-Liao border, and artificial ponds of all sizes have been excavated all over the surrounding area; There are also various Northern Song Dynasty border guards echoing each other, and hundreds of ships are cruising back and forth on the Great Wall of Water; It is like a new type of defense line integrating land and water, waiting for the Liao army with open arms.

Many Western scholars in later generations believed that the Great Wall of Water in the Song Dynasty was a very classic operation in the history of medieval military engineering.

How classic is the Great Wall of Water, the most vocal is the Khitan army of the Liao State, which has been fighting for many years.

In the following Song-Liao War, the effect of the new Great Wall of Water was immediate; The Khitan cavalry corps, which had galloped like no man's land before, stepped into the crisscross of the river, as if it had been put on a rope of all sizes and could not move.

The easy battles that used to be fought are gone; On the contrary, the infantry-based Song army could easily deploy troops and deploy troops by virtue of its absolute superiority in water transportation capabilities; Concentrate superior forces to meet the Liao army, and even be able to stabilize the front at the same time; Launch a surprise counterattack......