Riding the wind of rebirth

Chapter 220 Multidisciplinary Analysis

Because Yan Xiao is leaving today, He Shiqing's interest is not high, and Yan Xiao is also trying to make jokes to make He Shiqing happy.

Zhou Zhi said: "Salt Mouse and Mangzi are people from the country, and they can't take a few days off every time they go on vacation. Fortunately, I will go to Sichuan Capital in a few days, and I will go with Shu Yi to see you when the time comes."

"Ah?" Jiang Shuyi became nervous: "No, I went to see grandma with my dad, I didn't say that I was with Zhou Zhi..."

"Another shameless!" Feng Xueshan once again expressed her contempt.

"That's true." Zhou Zhi didn't take it seriously: "Shu Yi, think about it, when you arrive in Sichuan, don't you visit Vice President Li? Don't you visit Sister Xue Li? The old director? For those who have selflessly helped Those who have passed us, we must do our best, right?"

"There are still learning materials, so we have to go to Zhang Weiran and Xu Hui, why don't we go together?"

"That's right...I'm sorry Zhou Zhi, I didn't think about Zhou Zhi." Jiang Shuyi hurriedly apologized.

"Oh my god, are you just apologizing?" Feng Xueshan hugged Jiang Shuyi to her side: "Shuyi, you are too easy to lie, you are obviously a dead hand trying to find a chance to get close to you, and you even made it to him Seems to make sense."

"But...it makes sense, you have to listen..."

"Shu Yi's attitude is correct." Zhou Zhi nodded in agreement, "Don't ask the source of the truth, ask yourself if it's right."

"Even if it is the enemy's claim, as long as it is right, then listen to it. For example, the Qin State repaired the Zhengguo Canal."

"How long has the Zhengguo Canal been built? How beneficial is it?" Zhang Lu asked questions without delay while eating.

"The record in "Historical Records Hequ Shu" is 'more than 110 hectares of irrigated land with bittern', which is almost [-] million mu, and 'the harvest is one bell per mu', which means that the yield is almost [-] catties per mu. Fertile, there is no evil year'. Since then, the flood in Guanzhong has been basically controlled, and it has the reputation of the first 'Land of Abundance'." Zhou Zhi also eats and explains without delay.

"The population of Qin State at that time, according to Mr. Fan Wenlan's estimation, was between 200 million and 300 million. The Zhengguo Canal project took about ten years, and it increased Qin State's per capita grain possession by [-] catties."

"Note that this is extra out of thin air. According to the analysis of the amount of three buckets of grain carried by each person in ancient wars, which can last for half a month in a regular march and battle, if all the extra grain can be transported to the front line, it can support a 30-year-old battle. Ten thousand troops, a one-month war."

"Of course it won't be so beautiful in reality, but it must also be noted that so much food is only a year's increment."

"So there is no doubt that Zheng Guoqu's increase in Qin's national power is at the level of progression."

"Is there any evidence for your data?"

"Yes, there is a record in the "Wu Jing Zong Yao": "In the old law, a person holds three buckets of dry food, which can be used for several ten days. If the teacher is in the Tao, the destination is still far away, and the storage is exhausted, so he must choose lean cattle and horses as soldiers. To serve as food for the army, with all the manpower, we will not be trapped by thieves."

"Are you a liberal arts or a science?" He Shiqing also became interested: "You are almost doing math problems."

"In the first place, we should conduct multidisciplinary analysis." Zhou Zhi said, "This is the advantage we have over the ancients. We study both arts and sciences, and use all available methods to study problems."

"For example, there is a famous historical event 'Iron Lock Hengjiang', because in Liu Yuxi's poem, 'Wang Junlou's boat went down to Yizhou, and Jinling's king's spirit was sadly collected. Qianxun's iron lock sank to the bottom of the river, and stones came out of a piece of falling flags.' In this sentence, I thought that the incident happened in Jinling, and Sun Hao used iron chains to cross the Yangtze River in the upper reaches of Jinling, so that the warships of the Western Jin Dynasty could not go eastward, but it was actually wrong."

"If you look up the information, you will find that Wang Jun, the governor of Yizhou in the Western Jin Dynasty, was ordered to build a warship and planned to conquer Soochow. The sawdust produced during the shipbuilding flowed to Jianping County with the Yangtze River. Sun Hao submitted to Sun Hao, thinking that the Western Jin Dynasty was building warships and intending to attack Wu, and asked Sun Haozeng to send defenders to Jianping to defend, saying that as long as Jianping did not fall, the Western Jin Dynasty would not be able to cross the river to attack. But Sun Hao would not listen. I was helpless, The only way to do this is to make iron chains and put them down across the Yangtze River at dangerous places; and make big iron cones and place them in the river to try to prevent the warships of the Western Jin Dynasty from advancing eastward."

"Where is Jianping? It is now Zigui, a dangerous place in the Three Gorges. It is still thousands of miles away from Jianye in Soochow."

"So locking the Hengjiang River is actually cutting off the Three Gorges?" Zhang Lu asked.

"That's impossible." Wei Fei reacted quickly: "Looking at our Jiachuan, we know that the water level of the Yangtze River in the dry season and the peak season differ by more than 15 meters. How can we use iron chains to stop it? Also, even if we cross the river there, the length How long is it? How much iron is consumed? How much power can these iron materials be used to make weapons and arrows? Which method is more cost-effective?"

Zhou Zhi gave Wei Fei a thumbs up: "That's the way of thinking, the way of science. Even in Jianping County, assuming that the iron chain across the Yangtze River blocks the building and ships, it would not be possible for Wu's national strength at that time."

"However, there are indeed records in history. In the fourth year of Tianji, which is the first year of Taikang in Jin Dynasty, Wang Jun led his army to attack Wu. Most of the defenders of the cities along the river surrendered, or were soon attacked, but Wu Yan led the army to stick to Jianping. In the end, Wang Jun used a big raft to remove the iron cones under the water, and burned the iron chains with fire, and "then went down to Xiling."

"Xiling is Yichang, and Wang Jun finally broke out of the Three Gorges."

"Then this also shows that the 'Iron Lock Hengjiang' is true. How should this be understood?" Zhang Lu asked.

"Actually, it can be explained from the point of view of modern military science." Zhou Zhi said: "If you think of locking Hengjiang with iron and concealing iron cones as measures to protect Jianping, it can almost be explained."

"Zigui is located on a dangerous terrain. At that time, Jianping was located between the Yangtze River, Xiangxi River and Mancao River. If Jianping was properly guarded, it would be a nail in the middle of the Three Gorges. If it cannot be taken down there, Wang Jun would never dare Go east."

"This should be easy for us Jiachuan people to understand. During the Southern Song Dynasty, our Jiachuan God Arm City and the Diaoyu City in Hechuan downstream were the two places. The Mongolian army could not move eastward along the Yangtze River for decades. This is the reason for diverting to Xiangyang."

"Yes, otherwise the retreat will be lost, and the entire army will have to be wiped out." Zhang Lu nodded.

"Thus, the iron chains and the iron sign are mostly measures to defend Jianping City. They can only be set up in the Xiangxi River or Manger River around the city. They are powerful measures to prevent Wang Jun from using waterways to attack the back road of Jianping City. Compared to crossing the Yangtze River, it is much lower, and it can be accomplished by a prefect of a county."

"I wish I could go and see it sometime." Zhang Lu is a fan of the Three Kingdoms. After Zhou Zhi's analysis and Wei Fei's supplement, he realized how wrong the "truth" he once thought was: "Because of emotion and reason, this inference of yours is much more reasonable than the idea of ​​'Iron locks across the river'."

"You guys never stop talking about wars." Feng Xueshan concluded: "Have you finished eating? Let's go!"

(End of this chapter)