With this sand table, strategizing, arranging troops, and winning thousands of miles is not an empty word.

Although the Book of the Later Han Dynasty and the Biography of Ma Yuan Lie recorded a three-dimensional geographical model of gathering rice as a valley and fingering the situation, in the following era, the sand table that was really used to praise and paint military operations was not popularized in practice.

It can even be said that for a long time, almost no one used it.

This should have been a strange phenomenon, but it is not uncommon in Chinese history.

Many new technologies, new creations, and new inventions were first developed by the Chinese, but later they were either lost, or only a few strokes on paper, and did not spread them, let alone continue to progress and develop on this basis.

One of the reasons is the limitation of knowledge, and there are not enough scientific theories and technologies to support new things and principles.

Therefore, even if a few people with superior IQ or skills have achieved invention and innovation, it does not mean that all people can do it, and it is easy to "die and be perfect".

Another reason is the inter-industry estrangement, that is, most of the inventors and innovators have no cultural knowledge, and the scholars who are recorded in the book do not understand science and technology.

Therefore, if future generations want to re-restore these technologies and innovations according to the records of ancient books, they will find that the description is too brief, and a few words need to be repeatedly studied and pondered, and there will even be ambiguities and disputes.

For example, frying steel is a technological revolution in the history of steelmaking, and China is more than a thousand years earlier than Europe. However, in the earliest historical accounts, only indirect descriptions can be found.

As recorded in the 72nd volume of the Taiping Sutra: "Let the engineer smelt the stone, ask the iron to be smelted, and make it into water, and then make the good work ten thousand forged, and it will become Mo Xie (the ancient sword)." ”

In just one or two sentences, first of all, the word fried steel is not clearly proposed, and secondly, the process of frying steel is omitted to the most streamlined.

Therefore, in later generations, there was a controversy about China's steel frying.

Some people are proud of this, the ancestors are really powerful, leading the crooked nuts for thousands of years; Some people say that this method makes sense in principle, but the problems of furnace temperature and removal of impurities are difficult to overcome and are technically impossible.

Xu Qilin has seen the controversy on the Internet in later generations, you quote the classics, I list the data, and the fight is full of spittle and blood.

Ancestors, ancestors who read and read and recorded in history, you just didn't practice it yourself at that time, but you could die if you wrote a few more words?

Having said all this, it is to explain these strange phenomena in Chinese history.

Although many innovations and inventions are recorded in the annals of history, later generations read them more as a story, as a legend or apocryphal fabrication, as an example of what to say. Rather than actually doing it, to achieve it, to prove it.

Just like His Majesty Li Er, although he has read the record of Ma Yuan's "gathering rice for the valley", he does not know whether it is true or false, and he does not have the insight to really point to the three-dimensional geographical model of the situation.

Therefore, when the three-dimensional sand table made by Xu Qilin was presented in front of him, it brought him not only shock, but also surprise.

As one of the best emperors in Chinese history, His Majesty Li Er has an intuitive sensitivity to military affairs and a fanatical fondness.

As long as the terrain of the battlefield can really be reconnoitred clearly, and it can be displayed in this three-dimensional form. Then His Majesty Li Er can indeed strategize, formulate battle plans, or grasp the battlefield situation in the distance, and even intervene in time to indicate the strategy.

Similarly, this is also an idea that Xu Qilin uses to provide in kind. It is of great significance to military command, and it is not an exaggeration to say that it is a milestone.

“…… If it is here, it is necessary to line up and fight the enemy. Xu Qilin continued to pose the little wooden figure and explained, "According to the terrain shown above, the cavalry can be placed here, and the infantry can be placed here......"

His Majesty Li Er immediately shook his head and said, "The terrain here is uneven, it should be a hilly area, which is not conducive to cavalry. ”

Xu Qilin looked at His Majesty Li Er, blinked his eyes and said, "This, there will be some flat land in the hilly area, right?" ”

His Majesty Li Er waved his hand, and he didn't want to explain more.

Xu Qilin is young and doesn't understand the battle formation, if it is a military general under him, he will have to reprimand him, and even reconsider whether he can use it in the future.

"Why is my Tang Army a black armor suit?" His Majesty Li Er picked up a small wooden figure casually, fiddled with it twice in his hand, and took off the small wooden plaque on it.

Xu Qilin looked at it for granted, and said: "The grass people only know that my Tang Xuanjia Army is invincible and incomparable, isn't it named because of the soapy black armor?" ”

His Majesty Li Er was stunned for a moment, then stroked his beard and smiled, showing smugness and pride.

In the last years of the Sui Dynasty, the world was in turmoil, and the Li Tang group took advantage of the situation to unify the four seas and establish the Tang Empire that would shine in later generations.

Among them, the then King of Qin, now His Majesty Li Er, almost single-handedly laid down half of the country, eliminated Xue Rengao, Liu Wuzhou, Dou Jiande, Wang Shichong and other separatist regimes, and unified northern China.

And His Majesty Li Er's ability to establish such a world-renowned feat is inseparable from a strong army under his command. That is the Xuanjia Army, which has made great achievements and is famous through the ages.

Among the strong armies in Chinese history, the Xuanjia Army is also on the list. Its combat effectiveness is comparable to the Beifu soldiers of the Eastern Jin Dynasty, Genghis Khan's cowardly Xue army, Yue Fei's Beiwei army and other ace troops.

Doesn't Xu Qilin know the color of the Tang Army's clothes now, and the Tang Army can't be seen in Chang'an City?

That's right, this is a very ingenious sycophant, Xu Qilin deliberately pretended to be stupid and tender, relying on his young age, and gave His Majesty Li Er a high hat without a trace.

You see, His Majesty Li Er, who put on a top hat, was immediately happy.

The Xuanjia Army is the sword of His Majesty Li Er's expedition to the east and west, sweeping the world, and breaking 100,000 in the Tiger Prison Pass, which is the pinnacle of glory.

Praise the Xuanjia Army, it is equivalent to praise His Majesty Li Er; mentioned the Xuanjia Army, that is, it scratched the itch of His Majesty Li Er; How can His Majesty Li Er not be happy, how can he not be unhappy?

"Qi Lin doesn't know the clothing and armor of my Tang Army." His Majesty Li Er explained with a smile: "This is also understandable. ”

While speaking, His Majesty Li Er inserted the small wooden card on the head of a little red man, groaned for a while, and put it in the position of Songzhou.

Songzhou, now Songpan, Sichuan, is known as the "gateway to western Sichuan", and its geographical location is extremely important.

Xu Qilin also had to secretly admire that as a generation of military strategists, His Majesty Li Er's vision was quite accurate and unique. A few months later, the first war of Tang Tu broke out in Songzhou.

His Majesty Li Er was a little fascinated by deducing the command on this sand table, one in the east and one in the west, so anxious that Xu Qilin scratched his ears and cheeks.