On the third day of the fourth month, outside the Sword Gate.

When Liu Bei sent a messenger to find Li Su and ask him to return to Nanzheng to discuss important matters, Li Su was debugging and accepting his "lever trebuchet" outside the Jianmen Pass.

Li Su was also accompanied by the Youth League including Zhuge Jin, Zhuge Liang, Mi Wei and other youth groups who were originally supposed to study with him in name, so that Li Su could practice the application of trebuchets while teaching them basic physical principles and mathematical algorithms.

This winter, his "Agricultural Politics and Essentials" was finally written, and he didn't know a lot of details of farming experience, so he also asked the old farmers to make up for it. Since the beginning of the first month, Li Su has been tinkering with the lever-type catapult there when he has nothing to do, and occasionally fulfilling his obligation to be a teacher-

When Zhuge died, he entrusted the education of his sons to Li Su. Zhuge Jin has been dead for more than a year and a half, Li Su has always been free-range to Zhuge brothers and Mi Wei, and Zhuge Jin has been taught his younger brother by the subset of history.

It wasn't until Zhuge Liang was ten years old that when Li Su tinkered with the trebuchet, he remembered that Zhuge Liang in later generations was also an engineering genius, and improved the Yuanrong crossbow, as well as the legend of the wooden ox and the flowing horse. Li Su didn't want to waste Zhuge Liang's mathematical talent, so he took him with him, taught him mathematics with what he learned, and inspired his brain.

Before teaching, Li Su also tested Zhuge Liang's knowledge once.

It was discovered that he was a 10-year-old child, the age of a fourth-grade elementary school student, but his level of historical, literary, and philosophical speculation had already reached the level of later high school students.

Only the level of mathematics class is worse than his physical age, which is basically equivalent to the third grade of primary school, and physics does not even understand basic common sense, at most he only knows how to use the fragmentary experience of gravity buoyancy, and he can't talk about learning.

In this case, of course, Li Su has to show his skills, and after a few months of tinkering with the catapult, Zhuge Liang's mathematics level has been integrated and improved by leaps and bounds to the level of graduating from primary school, and the general knowledge of physics has basically reached the level of junior high school students who have just taken a physics class for a year.

It's just that Li Su didn't summarize so many system "laws" for Zhuge Liang, purely from a practical point of view, in the engineering practice of catapults, he talked about "gravity/buoyancy/action and reaction force/force decomposition analysis/thermal expansion and contraction".

These Zhuge Liang can understand, and even help Li Su make some practical calculations, so there is no one with IQ.

……

"Boom~"

With the first 100 Han catties of stone bullets fired from the lever-type trebuchet, under the cover of Teng Dun and the wooden fence fortifications, flew out a distance of 200 paces, smashed on the wall of Jianmen Pass, and shattered down to pull some gravel, Li Su knew that his experiment had preliminary results.

The head of the city was slightly flustered, apparently the defenders of Jianmen Pass were attacked by catapults for the first time, and they were a little caught off guard, although only two or three soldiers were injured by the debris because of the large support, and the noise caused by this lasted for a while.

The teenagers around Li Su cheered and felt the value of "learning physics" for the first time.

Ten-year-old Zhuge Liang was more careful than others, learning from the master to hold a small folding fan, gesturing there, muttering to himself:

"I didn't expect that all things can be transformed and quantitatively analyzed in this way. Adding an extra twenty pounds of stone yards to the weight basket can be equivalent to adding one more warrior to pull the cannon tip through the pulley, one increase and one decrease, so accurate, heaven and earth are not deceived. ”

Zhuge Liang's emotion is not unreasonable, but because the trebuchets in China since ancient times are actually easier to transform into "lever counterweight trebuchets" than those torque machines in the Western world at the same time.

Many people in later generations watched the romance and thought that the catapult was invented by Liu Ye during the Battle of Guandu, which is of course just a family saying. There have been catapults in China since the Warring States period.

At the end of Greece and the beginning of Rome, animal tendons were used to make torque springs, which were wound like clockwork and finally fired. The catapult of the Warring States period in China was a lever, with a long throwing arm and a short towing arm, and then a few hemp ropes hung down from the end of the towing arm, called a cannon tip, which was pulled down like a seesaw by manpower to shoot out the stone at the other end.

Therefore, in the Warring States Period, I have to admit that the efficiency and accuracy of the leverage machine in China are not as good as those of Greece and Rome. In those years, the geometry and physical theories of the West were indeed slightly stronger than those of the East, after all, they had Archimedes and Euclid. (But after Greece was replaced by Rome in the West, mathematics and physics basically stagnated and made little progress, and by the middle and late Roman periods it was getting worse and worse.) At the end of the Eastern Han Dynasty to the Northern and Southern Dynasties, there were Zhang Heng and Zu Chongzhi, who had already overtaken them, who let the West enter the Dark Ages)

The biggest disadvantage of the manpower rope lever machine over the torsion machine is that the range and power of each launch cannot be accurately quantified and controlled - how many turns on the twisted string clockwork, how far the stone will be thrown, this can be accurately mathematically calculated, and Roman and Greek war engineers also have a range meter. There are errors such as the size of each person's strength and whether the force is neat or not, just like a tug-of-war, and the accuracy and distance of the throw cannot be mastered.

The Warring States trebuchet basically only has a dozen people pulling the rope to exert force, and it is easy to coordinate. In the Qin and Han dynasties, the large trebuchet could have seventy people to pull the rope, so they could only get on the pulley group, turn the rope to be pulled horizontally, and many people pulled each rope together, like a tug-of-war. The simultaneity of the force is solved, but the power loss is greater, because everyone is pulling horizontally, rather than falling down on their own weight.

But all this, with the human dragging into a weight counterweight, directly skipped the drawbacks of the Western torque machine, and in one step put the lever into the "accurate power calculation" of the accurate killing weapon, and the charging effect far exceeded the West several times.

A small counterweight of 20 Han catties can smoothly equivalent to the performance of a strong man! What a manpower saving! The counterweight of 1,400 Han Jin (330 kg) is equivalent to the effect of the original 70 people dragging the cannon tip, which can throw a 100 Han Jin stone out of two or three hundred steps.

As long as you prepare two very long and thick hemp ropes, cut a small section of the knot before each launch, and re-tie the knot before the next launch. In addition, all that is consumed is the stone bullets, the physical strength of a few people, and the wear and tear of the machine.

Li Su watched for a while, and saw that Liu Yanjun's soldiers were all smashed and lost their temper and hid, and their morale was quite hit, so he announced in high spirits:

"I believe that in two or three days, the military information that is being continuously bombarded by the new trebuchet on the city wall will reach Liu Yan's ears. He must have thought that we were going to rely on this new weapon and take Jianmen Pass as the main direction of attack, so as to increase troops and mobilize vigilance here.

In this way, at least a large part of the reinforcement firepower can be attracted to the battlefield of Bajun on the Eastern Front. We can also rest assured that the virtual is the real and focus on the Eastern Front. ”

"Master, we also have to prevent them from being smashed into anger and going out of the customs to attack our catapult position." The young Zhuge Liang couldn't help but remind.

Li Su touched his hair proudly: "How could I not be guarded?" The terrain of Sword Pavilion Road is destined to suffer who takes the initiative to attack. Although there is no pass city wall on our side, we have also set up a camp more than 200 steps in advance.

There are wooden fence stakes and guards, and there are independent rattan shields in front of each machine, as well as arrow towers with buttresses and antler pits. If Zhang Ren's soldiers were smashed and dared to take the initiative to rush out, the 800 people in Gaoshun could teach Zhang Ren to be a man. ”

The Sword Pavilion Road is so narrow, and the attacker can't spread it out even if there are too many troops. As long as the defender's individual soldier quality is elite enough, he can defend no matter how he defends. Eight hundred people in the camp were iron-clad and slashed horses and swords, and Zhang Ren's people rushed up to the end of "everyone and horses were broken".

Wait obediently to be consumed until your morale is exhausted.

Li Suzheng was proud, and a herald came to report quickly: "Zhonglang, a messenger from the general of Zhengxi has arrived, please Zhonglang return to Nanzheng quickly, saying that he heard that the generals in other towns have launched a crusade against Dong Zhuo in the name of the three princes of Jingshi." At the time of the report, it was rumored that seven or eight foreign town herdsmen had responded, and General Zhengxi wanted to inquire about countermeasures. ”

Li Su was still unsatisfied, scratched the itch with a folding fan, and asked Gao Shun: "You will lead the people of the headquarters, block this camp, throw stones and harass you every day, don't let Zhang Ren come back and destroy the camp, no problem, right?" It may take months to keep it. ”

Gao Shun arched his hand: "Zhonglang rest assured, it's no problem to keep it for a few years." ”

Li Su patted him on the shoulder, and then he was relieved to return to Nanzheng.

……

After arriving in Nanzheng, he didn't talk nonsense, Liu Bei went straight to him and made a clear introduction to the response of the outside world to Dong.

Liu Bei: "We only got the news a few days ago, it is said that this matter was originally initiated by Cao Cao in mid-January, but except for Chen Liutai's guard Zhang Miao and Bao Xin, who was originally ordered by He Jin to recruit troops in Yanzhou, the rest did not make a sound.

It wasn't until the beginning of February that Qiao Mao pretended to be a series of fake books in the name of the three princes, and only then did he pull up seven or eight families. Si is subordinate to Hanoi Taishou Wang Kuang; Jizhou has Han Fu and Yuan Shao; Yanzhou has Liu Dai and Yuan Yi; There is a thorn in Yuzhou, Kong Ling; Jingzhou has the rear general Yuan Shu and Changsha Taishou Sun Jian.

The men and horses of the eleven roads in the five states were stationed in four places, the soldiers of Jizhou and Wang Kuang joined forces in Hanoi, and the other three states were stationed in the counties bordering Sili in their own states. ”

Of course, the so-called eighteen road princes to discuss Dong do not exist, and Liu Bei knows a total of eleven roads. In the official history, Liu Yan and Liu Yu did not ask Dong, and Gongsun Zhan naturally followed Liu Yu and did not ask Dong.

In fact, Zhang Miao's younger brother, Guangling Taishou Zhang Chao also joined with his brother, which is considered the twelfth road, but Guangling is in Xuzhou, it seems that his people also played the banner and did not rush to the front-line battlefield in the end.

Of course, Liu Bei didn't have time to know such remote gossip here-with the difficulty of Shu Dao, you must at least be the person who "telegraphed" and said that he would raise troops before the end of February, so that Liu Bei could hear it.

After the introduction, Liu Bei also added his attitude: "I also specially inquired, Liu Youzhou Bo'an Gong has no intention of raising troops, Bo'an Gong is your and my old master, and he has the grace of promotion and appreciation, so he can't help but report it." My original intention was that if Bo'an Gong raised an army, then we must follow it no matter what. But since Bo'an Gong and Brother Bogui were afraid that the court would not move, we had to be cautious.

As a shepherd of the Han family, he was the first time to ask for Dong, and it was inevitable that the Seven Kingdoms would seize the throne. Even if I wanted to raise troops, I categorically couldn't raise troops in person, so I had to excuse myself on the grounds that I was an assassin and had no direct military authority, and let my subordinates choose one or two to send troops.

However, we also got the news later—we got information about the situation at the end of February in the Kanto region, and even the information in Kinai and Sansuke at the beginning of March. According to the latest information, Dong Zhuo's gang actually killed the abolished emperor Liu Wei after hearing the news of Qiao Mao's fake book raising troops! This crime is several times heavier than the previous abolition. If it is just the abolition of the establishment and the chaos of the government, it may not be possible to attack by force, but the killing of the old monarch must be condemned, otherwise there will be no clear righteousness. ”

Li Su patiently listened to all of Liu Bei's views: "Since my brother has already made a decision, and I feel that Dong Zhuo's killing of the abolished emperor is intolerable, then it will be made clear in the letters and tandems to the other princes at that time, so that it seems that our troops are even more 'forced to be helpless', and the division is famous and righteous." In this way, even if we are a few months or even longer late, we will not be accused of delaying, but will gain more fame.

As for how to send troops, or how to find an excuse to explain the temporary attempt, I don't think it's difficult - do you think that as long as you make up your mind, you can definitely send troops? Shu Dao attacked, nothing more than a few roads.

The election is to go to the Guandao, go back to Chencang, go to Chang'an, go out of Tongguan, and go to the Cuihan Road to attack Dong Zhuo. But Chen Cang is still the general of the cavalry, Huangfu Song, guarding the town. When I entrusted Princess Wannian to the jurisdiction of the general of the chariot cavalry, my brother also said that only the head of the general of the chariot cavalry should be seen.

This time, why don't we directly send thousands of troops to Chencang, and ask the general to accompany him? If Huangfu Song blocks and does not let him pass, it is not that we don't want to please Dong, but we are forced to attack by two righteousness, and we can't help ourselves. ”

When Liu Bei heard this, his eyes lit up, and then he was surprised: "Does Brother Xian think that at this juncture, Huangfu Song will still stand on Dong Zhuo's side?" Not only does he not personally ask for Dong, but he may even bear the notoriety of blocking us from courting Dong? ”

Li Su smiled: "Huangfu Song is sixty years old, he is already a hero, he has been a loyal minister of the Han Dynasty all his life, I expect that he will want to leave a name in history in the name of a loyal minister of the Han Dynasty, and he will not be lost in the evening." Not to mention that he will be foolish and loyal to the imperial court now, even if Dong Zhuo pretends to use the name of the Son of Heaven to cut his military power, I don't think Huangfu Song will necessarily resist. ”

Liu Bei was stunned, he was still young, and he really couldn't understand how strong this kind of inertia that would sink for a lifetime was to smash down.

"Huangfu is such a person...... In this regard, the foolish brother is not as accurate as the virtuous brother. Even so, the virtuous brother can also negotiate with Huangfu Song first, and put on a righteous and awe-inspiring posture. ”

Li Su was not satisfied, and continued to add: "We want to go out of Shu to ask for Dong, and the road is not only one of Huangfu Song's Chen Cang Road. Theoretically, Shangyong went out of Hanshui to Nanyang, and he could also join forces with Yuan Shu and Sun Jian.

However, it is easy to advance the Qinling Han River channel downstream, but it is difficult to retreat against the current, and our army has not built the water transport locks and Tuntian Pantan transfer points in Shangyong counties - even if they are built secretly, we can keep it secret from the outside world at this moment, as if it has not been built yet.

Even so, our military rations could not be transported from Hanzhong to Nanyang for self-sufficiency. If we want to take this road and send troops, we must first give Yuan Shu a letter, and then give Sun Jian a letter to persuade Yuan Shu from the side, and by the way, make a circumstantial evidence. As long as Yuan Shu is willing to supply us with 20,000 soldiers and horses for half a year's grain and grass, about 300,000 or 400,000 stones, and directly allocate it to us, then we will send 20,000 troops to Nanyang and Luyang to help in the war. If Yuan Shu is unwilling to give food, it is Yuan Shu's fault, it is Yuan Shu's lack of sincerity to please Dong, which just hits Yuan Shu's prestige and makes Sun Jian recognize Yuan Shu.

Even if these two roads out of Sichuan are blocked, theoretically we have a third one - from Jiangzhou, out of the Three Gorges of the Yangtze River to Jiangling, and then take the Jingzhou waterway to the north to seek Dong. It is far easier to transport grain by ship in the Three Gorges of the Yangtze River than in the upper reaches of the Han River in the Qinling Mountains, but in this way, the beneficiaries should also cooperate with us to take Diaoyu City first, and then take Bajun County to govern Jiangzhou, so that we can go out of Sichuan to fight Dong. ”

Liu Bei was analyzed by Li Su and was dumbfounded.

, Brother Bo Yaxian thought about it for a few minutes, and came up with three routes to ask for Dong, and the reason why each of them couldn't send troops was that even the people who took the blame were found?

Anyway, Liu Bei had no choice but to shout slogans, gain a good reputation, and get a vote if he could actually send troops to get a vote. If you don't have a chance to make a profit, then you can make a reputation, and there are three back-pot heroes for Liu Bei to "suck the blood of fame", and draw the reputation of others to make up for his own reputation.

It's so vicious, fortunately, Brother Bo Yaxian is on our side.

This kind of traitor really didn't open for half a year, and he ate for three years. Just for the occasional flash of inspiration, it is also worth serving the Turkish bath Finnish bath hot pot skewer kung fu tea every day, and wait for half a year to wait for the occasional plan.

Liu Bei thought about it, but he was very unsure: "Brother Xian looks down on Yuan Shu so much? Do you think Yuan Shu is the kind of person who will be stingy with hundreds of thousands of stones of his own grain reserves, and is unwilling to contribute to the country, the court, and the public welfare of the world? ”

"Brother thinks too highly of Yuan Shu...... He is not Yuan Shao, if he is not careful, then he is not worthy of being called Yuan Shu. ”

Li Su said very firmly, he didn't think there was anything about it, and continued to play casually: "Isn't Yun Chang too guarded in Hanzhong?" Let Yuan Shu take the blame, come forward in the name of Yun Chang, and this road belongs to him. Isn't Yide too guarded by Wudu, so he took Chen Cang Road to let Huangfu Song take the blame for the negotiation, in the name of Yide.

Cai Gong is not too shou of Bajun, so he pretended to go out of the Yangtze River to Sichuan to ask for Dong to carry the banner, and let Liu Yan and Jiangling, Jingnan and other places also let him come, Cai Gongwen is brilliant, and the writing of the essay must be very exciting, which will definitely make my brother not arouse Dong Zhuo's vigilance, but also collect a wave of good reputation among the people of the world, which is conducive to attracting talents in the future. ”

"Okay, Brother Yixian, Brother Yixian! Foolish brother, this is arranged! Liu Bei agreed in a loud voice, and quickly sent an envoy to let the three roads prepare people and messengers together, and act in a full set.

In the afternoon of the same day, Guan Yu's messenger took a flat boat from Hanshui, "six hundred miles of Wudang in one day", went straight to the direction of Xiangyang, and turned to Nanyang to ask the miser Yuan Shu for food.

Two days later, Zhang Fei also reorganized 5,000 soldiers and horses in Hechi County, Wudu County, and traveled across the Dasan Pass in a full set of performances, and went to Chencang to discuss with Huangfu Song about borrowing and asking for support.

——

PS: This chapter is more than 5,000 words...... Then let's have two shifts today, four thousand plus five thousand, as much as three nine thousand.