Well? How could he have seen it? Didn't the first contour topographic map be drawn in 1791 by Tapontrier in France? Later, Cupin Trillime used contour lines to represent the landforms of the French realm; In the late 18th and early 19th centuries, contour lines gradually began to be used in surveying topographic maps; In the second half of the 19th century, the contour line method broke through the barriers of difficult identification and became recognized. Chen Qingzhi lived in the 5th and 6th centuries AD, where did he see it?

"Qingzhi has seen several woodblock maps in His Majesty's library, and two of them are quite similar to the maps drawn by the lord!" Perhaps seeing Li You's doubts, Chen Qingzhi explained.

Li You didn't know that in the wooden board map of the end of the Warring States period unearthed from Tianshui in later generations, there was a method of drawing mountain peaks with a closed curve, and Mawangdui had also unearthed similar cultural relics! He could only secretly guess now whether there would be other traversers who had been to the plane where Chen Qingzhi was.

While drawing, he checked the terrain he saw along the way with Chen Qingzhi, and explained to him from time to time the usefulness of scale and contour lines, Chen Qingzhi nodded from time to time and felt that he had gained a lot.

Early in the morning of the second day, the mission returned to the road, and the evil boys of Chang'an after the battle were refreshed, and the nervousness when they first went on the road became self-confidence after a big victory, and the scattered on weekdays gradually disappeared, and the long line looked much more regular than when they first came out of Chang'an.

And Chen Qingzhi also gained their recognition through this brilliant victory, and whenever he rode past the soldiers, they would always stop and salute respectfully.

"General Chen!" "General Chen!" The greetings were endless, and Li You was also quite happy to see this, a general who was trusted by the soldiers would undoubtedly have more room to play!

Of course, Chen Qingzhi would not let go of this opportunity, and while leading the team forward, he told the commanders and chiefs in the mission about the essentials of marching and entering battle!

The military system of the Han Dynasty inherited the Qin system and developed, and the military positions from small to large were Wu Chang - Shi Chang - Du Bo - Hundred General - Yamen General, Cavalry Governor, Ministry Governor and so on - Other Sima (Jun Sima) - Du Wei (Riding Du Wei) - Captain - Zhonglang General (Wuguan, Left, Right, Tiger Ben Zhonglang General is similar to the Five Schools) - General Pi - Partial General - Miscellaneous General - Four Expeditions, Four Towns, Front and Rear Generals and so on.

Five people are in the army, the army is set up as the chief, ten people are the chief, and the chief is set as the chief; Wu Chang and Shi Chang were both the most basic officers, and Li You controlled this army of less than 100 people by issuing orders to them! And now he has handed over this power to Chen Qingzhi.

Chen Qingzhi's command was obviously much higher than Li You's, and the speed and order of the team's march had improved compared to before! So before sunset, I arrived at the scheduled resting place.

Tangyi's father stopped the team and came to Li You to report, "Envoy, the road ahead is difficult, and there is no place to rest and camp; Why don't you spend the night here today, and then move west tomorrow! ”

"The deputy envoy is familiar with geography, according to your wishes!" Li You nodded in agreement, watched the members of the mission turn over and dismount, and began to set up camp in an orderly manner, cutting down grass and trees, and boiling water for cooking.

Unless the last resort is to march along the road, you must drink boiled water, which is also the rule that Li You made at the beginning, he remembered that the newborn champion Hou Huo was sick because he drank unclean water in the battle of Mobei when he pursued the Xiongnu in the future! And it seems that the reason why Huo Qubing is sick is because the Huns buried sick cattle, sheep and other livestock at the water source!

This primitive biochemical warfare method is from the first traitor in Chinese history who has just fought against Li You, although I don't know if the current BOC has studied this strategy, but Li You doesn't want to take risks! Moreover, drinking boiled water can also avoid all kinds of pests and diseases, as well as the problem of water and soil adaptation! Only good for soldiers.

After eating, he discussed with Tangyi's father, Chen Qingzhi, Pan Feng and others the matters to be paid attention to during tomorrow's march, and Li You began his own mapping work again! Yesterday I had already mapped most of the distance, and today I just need to make some additions!

Therefore, today's work was completed very quickly, and while drawing the map, I listened to Chen Qingzhi tell what kind of tactics should be adopted in the terrain he had just drawn, and before I knew it, the map was drawn in more than half an hour.

Li You carefully put away the map, this is the biggest gain of his trip! Even if you arrive at the Otsuki clan in the future and make an alliance with the other party, it may not be as important as this map! This will be the best information for the Han army to invade the Western Regions! With these things, I believe that in the future, the Han Dynasty army will definitely have fewer regrets like Li Guang who lost his way and lost his way.

After doing all this, Li You knelt down again at the back of several cases, added tea to Chen Qingzhi, and said respectfully, "General Ziyun, please advise!" Now that I finally have time to listen to Chen Qingzhi talk about his invincible and invincible mysteries of the art of war, Li You's calm appearance is extremely excited!

"The lord doesn't need to be so polite! Keiyuki learned such a wonderful drawing method from the lord, and it is also appropriate to repay it a little! Chen Qingzhi still looked so elegant, and he couldn't see that he was a famous general who won all battles, he sat up straight, ready to start telling Li You about his way of using troops.

"Qingzhi thinks that there is no victory in the world! No matter which famous general is on the other side of the battlefield, what kind of army of bears and tigers he leads, and what kind of dangerous passes he occupies! At most, these can give the enemy a greater advantage, but it is impossible to cut off all the chances of our army's victory! No matter what the enemy will show flaws, but the famous generals will show fewer flaws, and they will cover them better; And the flaws exposed by mediocrity are bigger and more obvious! In four and a half months, this world-famous general who captured 32 cities, won 47 complete victories in field battles, swept away millions of soldiers and horses, and had almost no casualties in the 7,000 trilogy under his command.

Then he stretched out his hand and dipped the tea to write and draw on the table, and drew the distribution of the Hun cavalry led by the Bank of China on several cases, and explained in detail to Li You the reason why he adopted the original strategy, "Although the enemy army is numerous, the valley is small and disrupts the enemy's layout, and our army has a chance to take advantage of it."

Li You kept nodding his head when he heard this, at that time he only felt that Chen Qingzhi won easily, but he didn't figure out what was the reason for winning, and now listening to Chen Qingzhi's explanation is quite open.

Suddenly, there was a heat in his chest, and the voice of the tiger talisman sounded again, "The host has obtained the inheritance of the famous general Chen Qingzhi and obtained the skill: Eagle Eye!" ”

Well? Skill? Eagle Eye? What is this?