O Yellow River! Li You secretly sighed in his heart, before the overhaul of the palace of the Han and Tang dynasties, the mountains of the Longxi generation are still lush with towering giant trees, and the Yellow River, which has not suffered from soil erosion, should still be clear water, right? I really want to see this kind of beauty that future generations will not be able to appreciate as soon as possible!

"General Ziyun! How did you discover the flaws in the Huns and come up with such a brilliant strategy? The Han mission continued to move forward, and Li You couldn't help but come to Chen Qingzhi and ask him about his thinking on formulating tactics at that time.

"I can't tell!" Chen Qingzhi scratched his head in annoyance, "It's just that after hearing that the lord relayed the strategy of the Xiongnu and the deputy envoy of Tangyi's father explained the terrain of the Xiongnu ambush, I vaguely felt that this method was useful!" However, if it weren't for the lord having a fierce general like Pan Feng, the strategy under him would not be able to be implemented! General Pan Feng's courage is outstanding, even compared with Yang Dayan of Great Wei, I am afraid it is not much better! ”

Yang Dayan is a famous general of Emperor Xiaowen and Emperor Xuanwu of the Northern Wei Dynasty, and is called Yang Dayan because of his big eyes like a wheel. According to the "Book of Wei", even if the three-zhang long cloth is tied to the bun and runs forward, Yang Dayan can make the cloth stretch straight behind without falling to the ground.

In addition, Yang Dayan was also praised as "the enemy of Guanzhang Ten Thousand People" because of his bravery on the battlefield, Chen Qingzhi followed Wei Rui in the Battle of Zhongli and the Northern Wei Dynasty's Zhongshan Wang Yuanying and Yang Dayan in the Battle of Zhongli, and the opponent's superb martial arts left a deep impression in Chen Qingzhi's heart! Now he uses Yang Dayan to praise Pan Feng, which is the highest praise for his martial arts.

Since Yang Dayan has been compared with Guan Yu and Zhang Fei, Pan Feng's martial arts are still far behind Guan Zhanglai, he is probably still inferior to Yang Dayan, right?

Hearing Chen Qingzhi say this, Li You sighed, it seems that Chen Qingzhi is a natural skill, I'm afraid there is no way to learn it? It seems that his hope of learning the art of war from Chen Qingzhi is not great!

It is also recorded in the history books about this aspect that Chen Qingzhi served as the personal entourage of Emperor Xiao Yan of Liang Wu in his childhood; One day, Xiao Yan was bored and asked Chen Qingzhi to accompany him to play, and Go is the same as the art of war, it is difficult for novices to defeat veterans! Chen Qingzhi, who is only thirteen years old, is certainly not Xiao Yan's opponent! But Xiao Yan made a wrong move carelessly!

And Chen Qingzhi immediately landed the chess pieces in the only place where the victory and defeat could be reversed! Xiao Yan couldn't help but be surprised, and immediately summoned the old chess players in the mansion to play against Chen Qingzhi! After taking Xiao Yan, he was surprised to find that as long as the old chess player did not make a mistake, Chen Qingzhi would definitely be defeated; And once the old chess player makes a mistake, he can always be caught by Chen Qingzhi.

It seems that this kid has the talent to get a glimpse of the only chance to win in a complicated situation! So Xiao Yan opened his family's private collection of books and allowed Chen Qingzhi to learn the art of war from them! And when he became an adult, despite his non-noble background, he was entrusted with a heavy responsibility! Chen Qingzhi did not disappoint him, and repaid his monarch with incredible victories again and again!

Just as Li You sighed, Chen Qingzhi spoke again, "But Qingzhi has also had a little experience after fighting over the years, if the lord doesn't dislike it, Qingzhi will communicate with the lord after camping!" ”

"Thank you so much, General Ziyun!" Seeing that the situation had taken a turn for the better, Li You couldn't help but be overjoyed, "Today I will wait for Ziyun's drive!" ”

"Well, it doesn't seem to work tonight!" In an instant, Li You seemed to think of something again, and said helplessly, "Today I am going to draw a map along the road for these two days, and I am afraid that I will not be able to ask General Ziyun for advice until I cross the Yellow River!" ”

"Oh? Will the lord also draw maps? As a famous general, Chen Qingzhi naturally understood the importance of maps, and as soon as he heard that Li You had this skill, he was immediately interested.

"If Ziyun doesn't dislike it, you might as well help me take a look at it later!" I haven't forgotten the geography of high school, and in this day and age, I'm afraid I can't find anyone who knows how to draw maps better than me, right? Li You finally found a trace of the superiority of the traverser in front of Chen Qingzhi.

At sunset, the mission stopped advancing, and Li You summoned everyone to write down their merits on the battlefield, and announced that when they returned to Chang'an, they would report their merits to His Majesty the Emperor and ask the Emperor to give them a reward! Then he ordered his cousin to arrange a celebration of wine and meat! The morale of the mission was boosted! Later, he handed over the scene to his cousin, who arranged the night watch and celebrations, while he returned to the tent to prepare a map.

"The rewards and punishments are clear, and the lord is the essence of the army!" Chen Qingzhi and Pan Feng also followed, Chen Qingzhi was curious about his drawing method, and Pan Feng was to protect his safety.

gave Pan Feng a jar of wine, and then gave Chen Qingzhi tea, Li Youfu held a brush on a few cases and began to draw a map on the sheepskin! At present, Cai Lun will not be born for more than 200 years, and the silk book is too fragile and the bamboo slips are too bulky, so the sheepskin has become the best choice for drawing maps.

Li You first drew a compass in the upper corner of the map, and then marked the scale in the lower right corner! As soon as these two methods came out, Chen Qingzhi was amazed, "The lord is wonderful!" ”

In ancient China, there were generally three methods of cartography: maps based on mountains and rivers, maps based on travel routes (waterways, roads, sea routes, etc.), and maps based on objective scales; These three methods were immature in both the Han Dynasty and the Northern and Southern Dynasties in which Chen Qingzhi lived.

There is no standard arrangement of up north and down south, left west and right east, nor does it have the concept of scale! If it weren't for people who were familiar with the area drawn on the map, most of them would only look confused! There's no way they can get any valid information from those stick figure maps!

Moreover, the scale of these maps is extremely irregular, some places are obviously hundreds of miles away, but only a few centimeters away on the map, and conversely, some places are several miles away, but they are separated to a few feet! Not to mention the width of the river, the height of the peaks! If anyone dares to really march according to such a map, General Fei will probably end up with him getting lost and committing suicide!

And with the scale, the leading general can get a more accurate distance by measuring! Although there is still a certain discrepancy between Li You's hand-drawn and visual data and the real distance, this is much better than that original map after all!

After doing all this, he started drawing the map with the contour line drawing method pioneered by Ducterrier in France in 1791. ”