Zhu Qi helped measure the data and put forward the requirements. All that was left was on-site guidance, waiting for the Jinwu Guards to make the sand table. As for doing it yourself? Zhu Qi had never considered it. Now he is a prince. If he makes a sand table and does it himself, then the prince is too much.

If possible, Zhu Qi was too lazy to even guide him at the side, but there was no way. His grid sand table, equal proportions and other requirements seemed to be a bit too demanding for these Jinwu Guard's military officers and soldiers.

For the sponsorship of the 1,000 taels of silver by Prince Zhu Biao, Zhu Qi could only personally guide him. As a younger brother, Zhu Di naturally accompanied him throughout the process. Fortunately, Zhu Di did not complain, but instead stared at the side throughout the process, fearing that any link would be missed. As long as it was related to the war, Zhu Di was very interested.

After a busy schedule, I finally finished making the sand table. It was almost evening. Fortunately, these soldiers who often make sand tables were helping each other, otherwise it would be impossible to complete the construction in one afternoon.

Zhu Di turned left and right three times around the sand table, which was amazing. Although Zhu Di didn’t know much about the sand table, intuitively, Zhu Qi must have made this sand table better!

The other soldiers were also impressed by the Liao King Zhu Qi at this time and praised him. Zhu Qi thought they were flattering, so he didn't care much. He led Zhu Di back to the palace, had a good rest at night, and went to find Prince Zhu Biao to get money tomorrow!

…………

At night.

In the dark night, the continuous torches of generals were illuminated. The soldiers guarding and patrolling were patrolling each other in a team of five men and women holding spears to patrol within four miles of the barracks.

Xu Da rode all the way to the gate of Jinwu Guard Camp. After the soldiers guarding the gate checked the ultimatum for the military camp to pass the military camp, they quickly made way. Xu Da walked all the way to the military camp and summoned the military officer.

The military lecture will be held tomorrow, and Emperor Zhu Yuanzhang will also be present. Xu Da followed the convention and came in advance to ask whether the preparations were in place in the military camp. The most important thing is of course the weapons and equipment of the soldiers in the military camp, so as not to make any mistakes tomorrow.

The quarantine officer did not dare to neglect it. He led Xu Da all the way from the grain warehouse to the armory. After checking it one by one, Xu Da asked some questions about tomorrow's process arrangements. After confirming that it was correct, he stared at the whole battalion gathering tomorrow morning and turned around and prepared to leave.

But the quarconian hesitated for a moment and said behind him:

"General Xu, there is actually one thing that my subordinates think it is better to report to you."

Xu Da held the reins and asked:

"What's the matter?"

The quartermaster said:

"Actually, today the King of Liao came down to the camp and seemed to have come to make a map sand table under the order of His Royal Highness."

Xu Da, who was sitting on the horse's back, didn't notice anything wrong, and smiled and said:

"His Royal Highness of the Liao Dynasty is very talented in this regard. I am not surprised that His Royal Highness of the Crown Prince would ask for this."

The quartermaster thought to himself, "Then I'll surprise you, okay", and then said respectfully:

"What I am trying to say is not that, but the map sand table made by His Highness the King of Liao is very different from what we used in the past."

“Subtly different?”

"Please follow me."

The quarantine officer led Xu Da to the military tent that he had inspected before and pointed to the map sand table. Xu Da walked over with doubts. He had seen many map sand tables, and he had seen all those with dummies on it. Isn’t it all the same? Can you still make flowers? As for what needs to be reported separately?

Xu Da was full of doubts, but after seeing the sand table on the map, he saw the mountains and rivers above, as usual, but the heights of the mountains looked up and down, and the sizes of the lakes were different. In addition, on the sand table map, there were also square grids of ordinary sizes, and even the Zijin Mountain in the middle was marked with three different heights of the mountain.

Seeing Xu Da’s face full of confusion, the quarantine officer knew that his report was right. It was the first time that General Xu, who was knowledgeable, had seen such a map!

"General Xu, I'll tell you in detail..."

…………

An hour later, Xu Da brought the sand table map and the confused quarrel officer, holding the tokens for entering and leaving the palace, and asked to see Zhu Yuanzhang late at night.

The quartermaster was really stupid. Although he knew that the map sand table made by His Highness the King of Liao was very useful and novel, he never expected that after telling General Xu Da, he would directly bring himself and this map sand table to meet the emperor!

It was midnight. Who knows if His Majesty was in the gentle place with which concubine? Anyway, if it were me, if he was interrupted during the creation of a human movement, he would definitely be furious.

Fortunately, the internal official who was passing the message saw that it was Xu Da asking for a meeting late at night, but he did not stop him. Not long after he entered, he heard the emperor's order, asking them to wait in the side hall.

The quarantine officer wanted to ask, but General Xu frowned from beginning to end, staring at the grid-shaped sand table without saying a word, and waited until the Emperor arrived. General Xu had just rushed over to salute.

Although Zhu Yuanzhang was shouted in the middle of the night, his face was pretty good and he didn't look displeased. Especially when he heard that Xu Da had a report on military affairs, he was even more expectant. After asking Xu Da and the quarrel to be exempted from the ceremony, he said:

"Xu Tiande, do you have any military affairs to report?"

Xu Da hurriedly asked someone to push the map sand table up and said:

"Your Majesty, I have obtained a powerful weapon to deal with the Northern Yuan Dynasty today. If I could carry this powerful weapon in the last conquest of the Northern Yuan Dynasty, I would definitely not be easily defeated by Wang Baobao in Lingbei. It would be hard to say whoever wins and loses!"

Zhu Yuanzhang was particularly surprised when he heard this, because he knew Xu Da very well, and was definitely not the kind of person who could find reasons or exaggerate. If he could say this, this powerful weapon would definitely be something that could control the situation of the war.

When he saw Xu Da pushing out the map sand table, Zhu Yuanzhang saw that the map sand table was indeed different from what he had seen in the past, but the mountains were still mountains and the river was still river.

Zhu Yuanzhang was quite puzzled and asked:

"Xu Tiande, this map sand table is what you call a powerful tool for the Yuan Dynasty?"

"That's right! What Your Majesty thinks must be because he thinks there is nothing special about this sand table? In fact, it seems that the Wei-Minist and His Majesty think the same."

Xu Da smiled, raised his hand and pointed to the sand table, and said:

"At first glance, this sand table seems to be no different from an ordinary sand table, but there are two unusual points. First, whether it is the height of the mountain, the size of the lake, the length of the road, the length of the road, it is called equal proportions. That is to say, the mountain is 120 feet high, and any section of the road is the same length as the mountain, in reality, it is 120 feet long!

Second, Your Majesty, please look at the squares one by one. The length and width of each square represent a mile length in reality. In this way, as long as you can obtain detailed information in advance, and then know where the army is on the map during the battle, even a mediocre general can see the distance around you at a glance!"

Zhu Yuanzhang also led his troops to fight himself, so he naturally understood the importance of the map. Maps are the foundation. If you lead a large army to march and fight, you will be blind to the surrounding environment. That would be a big fuck.

This is also why Zhu Qi drew a detailed map. Zhu Yuanzhang felt that he had a general. He recognized the map and recorded the map. That was the first element of a good general!

But many times, even if there is a map, how long it takes to go from one place to another? Such problems are often based on inquiries or the general's own intuition to judge.

This leads to a problem, that is, the accuracy is greatly reduced, and the personal experience of different generals is different. It is better to join forces in one place. Once the troops are divided and they arrive in a strange place, they can only fight for their own battles.

During the second Northern Expedition against Yuan, the Yuan people were more familiar with the local area than the Ming army, and they knew very well how long it would take for their own march and what time it was about the time when the Ming army arrived somewhere.

The Ming army's plan was to move forward with three armies, with offense and defense echoing each other, and to respond quickly when encountering enemies along the way. It looked perfect, but the reality was not the case.

For example, the army on the middle road crossed the desert and knew that there was a valley, but they didn't know how long the valley was and how long it took to travel. They could only look at the map and estimate that even if it was wrong for two hours, it would be enough to distance the left and right troops, and they could not pass messages and support each other in time. In addition, each general's judgment and intuition are different, and there will be different results in actual operations.

Because of this and that, it was difficult for the three armies to arrive at the location according to the established plan and time. However, the Yuan people were different. They could predict various situations based on their past experience and thus responded.

This is also an important reason why Xu Da failed to fight against the Northern Expedition of the Yuan Dynasty.

Zhu Yuanzhang was not a mediocre person. He knew that the benefit of such an accurate and intuitive map was that it could make the formulation and execution of combat plans more accurate, especially execution.

Equal proportions and grid sand tables seem to be a very simple method, but they were not invented until modern times, and at the same time made the sand table one of the extremely important props in modern wars!

Zhu Yuanzhang knew that this sand table must have been not what Xu Da did, so he asked:

"Who did this sand table? There is such a great talent in our Ming army!"

Xu Da smiled and said with a fist:

"Go to your Majesty, this sand table is made by His Highness the King of Liao!"

"What?!"

Zhu Yuanzhang was stunned. This was really something he never expected. Xu Da pointed at Zijin Mountain and said:

"By the way, the height of this mountain was measured by His Highness the King of Liao himself."

Zhu Yuanzhang was even more strange and said:

"It's impossible. I've never heard of Zhu Qi's child who asked someone to measure how high the Purple Gold Mountain is."

The quartermaster knew it was time for him to appear, so he hurriedly answered:

"I'm not hiding it to you, Your Highness, the King of Liao, went to measure it myself today."

Zhu Yuanzhang's great wonder:

"Today? He only took one day to measure how high the Purple Gold Mountain is?"

"Your Majesty, you guessed it wrong. Your Highness, the King of Liao, has not used it for a day."

The quartermaster shook his head and stretched out a finger:
Chapter completed!