It is necessary to help Zhang Fei advance by land and water, repel the waterway interception of Gan Ning, so as to cut off Zhang Lu's soldiers and horses in a roundabout way in the narrow valley terrain battle, so that they cannot take care of each other......

What should I open and hang up?

Faced with this problem, Li Su also went through all the gadgets he had tinkered with in the past half a month after he took down Nanzheng.

After taking Nanzheng for more than 20 days, Li Su was also a little busy every day.

In addition to focusing on the three major events of fighting against the residual poison of pyramid schemes, preparing for the education lottery, and eating, drinking, and bathing, he also listed himself as a liberal arts student and listed the small hangings that he could open in terms of technology and technology at this stage.

At that time, Li Su's first thought, and the easiest thing to think of, was to build a double-sided, metal-pedal stirrup, plus a saddle with a wooden liner bridge (the current saddle is soft, just a leather product spread on the horse's back).

These two things can improve the stability of the cavalry, and they can also allow the cavalry with ordinary riding skills to use the cavalry to charge without being pushed off the horse by the reaction force.

But then I thought about it, this year is mainly to fight Zhang Lu, and it is estimated that the next year after tomorrow will also be based on competing with Liu Yan first, and there is no room for large-scale cavalry charges in the battle of Shuzhong Mountain, so this thing can be suspended.

So Li Su just secretly made a few samples to make him more comfortable riding a horse, and used the experience first, not in a hurry to promote.

In addition to the stirrups on both sides, the second hanging that Li Su thought of was the gunpowder that was overused in later generations, and he really found someone to get the saltpeter, sulfur, and charcoal, which were the raw materials of gunpowder. However, under the initial encouragement, it can only be "burned without oxygen", but the blasting power is not at all.

Li Su estimated that with his half-hung liberal arts students and the level of experimental science of this era, he would not have seen the appearance of field gunpowder weapons in his lifetime.

(Note: The protagonist doesn't understand the liberal arts students in the first place, so don't expect guns to appear in this book, not even earth artillery, not even catapults that throw flower bombs.) Otherwise, it's not a trick, and it's not a reverse gold finger, I think it's very reasonable. ）

Although it is impossible to make gunpowder weapons, the thought that should be spent on gunpowder still has to be spent - it cannot be used on the battlefield, and it can be used when building water conservancy projects and opening mines, which can be regarded as benefiting the country and the people. In that case, you can slowly design and calculate, slowly dig holes and drill holes for construction, maybe the early black powder with an almost expansion rate is still a bit useful.

The reason why Li Su insisted so much was also related to an incident reported to him by assistant Zhuge Jin one day after he entered Nanzheng:

Before, when he set out from Chencang and crossed the Qinling Mountains along the Sanguan Road, didn't Li Su sigh "why is the stream flowing from the northern foot of the Qinling Mountains to Chencang so shallow, and there is only a river for a few months", and wanted to study the local transportation environment and the possibility of transformation. (If you don't remember, go back and read Chapter V, Chapter 73 "I Didn't Expect You to Be Such a Yangping Pass")

Li Su is a busy person, so he mentioned it at the time. But the leader said a word, the subordinates broke their legs, these days, after Zhuge Jin was empty, he went around to help check the information, and his younger brother Zhuge Liang liked to travel in the mountains and rivers, and took the soldiers to the scene to help Li Su dig rock samples, and by the way, he learned from Li Su how he looked at stones and recognized feng shui.

As a result, Zhuge Jin's hard work didn't matter, and he really excavated a very valuable major discovery for Li Su.

It was about half a month ago, and that day Zhuge Jin rushed to take the sample of "impact shale" that his younger brother obtained, as well as a copy of the "Book of the Later Han", and ran to Li Su to make contributions.

"Nakaro! Look what I found! The northern section of Chencang Road has been able to be transported by water since ancient times, and there is a river all year round! No wonder the roads were so difficult to walk and the grain transportation was difficult when our army entered Sichuan, but Han Xin could easily secretly display the warehouse back then!

It turned out that at the end of the Qin Dynasty, the Western Han River still flowed north into Weishui and finally into the Yellow River! Instead of flowing south into the Jialing River and finally into the Yangtze River, as is the case now! After the death of Emperor Gaozu, the Empress Lu called the system for a few years, because of the earthquake in Wudu County and the collapse of the Qinling Mountain, the Western Han River was squeezed into the Jialing River from then on!

You see, I found the original text for you from the "Book of Han", which is the original text of Ban Zhaoxiu's annotation "Gao Hou Ji": Empress Gao Lu, Emperor Hui...... In the first spring of the first year, the edict said: '......' in the spring of the second year, and the edict said '......'. Solo. In the first month of spring, there was an earthquake, and there was a landslide in Qiang Road and Wudu Road. Summer and June are obscure, and the sun is eclipsed. In autumn and July, the king of Hengshan does not doubt it. Eight baht money. ”

In the form of the Book of Han, each paragraph is an edict issued at the beginning of a certain year, and then ends with "Song Ke", indicating that the order of the emperor/empress dowager is over, followed by the major disasters or auspicious fortunes of the year.

Zhuge Jin read that "the first month of spring, the earthquake, the Qiang Road, the Wudu Road landslide", is closely followed by "Song Ke", which shows that it was a very serious disaster that year.

Zhuge Jin also helped Li Su check the date very sensibly, and the conversion of this "first month of spring" is the 27th day of January of the lunar calendar in the second year of the second year of Lu Hou (186 BC).

Li Su got this important clue from Zhuge Jin's inquiry at that time, and became more and more determined to "even if you can't make gunpowder weapons in this life, you must use gunpowder for engineering".

Since the water of the Western Han Dynasty does not flow to Chencang because of the "landslide", that is, the rocks on both sides collapse to block the valley, rather than the entire uplift of the mountain, it is still possible to rescue this kind of river diversion through dredging. (If the whole mountain is raised, it will not be saved, and I don't know how deep the hard rock will have to be dug up)

Of course, maybe in this life, when Liu Bei comes out of Chencang in the future, it will not be so difficult, he has already done something to the city defense of Chencang City before, and he can fight it without a protracted war of attrition, and he does not need to continue to transport grain to the north through Chencang Road.

But Li Su wants to work hard and waste money to engage in this project, of course, there are other earth-shattering and poisonous conspiracy behind it, and the specific details behind it do not need to be repeated for the time being, in short, the farming technology of "gunpowder for engineering blasting", Li Su is ordered, and it will take a few years to slowly grind and improve it.

However, don't look at the fact that gunpowder can't be used as a field weapon, but when Li Su asked the craftsmen to tinker, he was still more open and encouraged, allowing them to use their imagination to make any research and development deduction of burning and poisonous smoke equipment.

In addition, at that time, Zhuge Jin was greatly praised by Li Su for studying the "Book of Han", and the young people's morale was high for a while, and they buried themselves in reading hard every day, and actually helped Li Su find some useful gadgets.

That was about Zhuge Jin's report on the Book of Han. A week after Gao Houji, I learned that Li Su was thinking about how to make strange tricks and tricks to build water conservancy, and after Zhuge Jin studied it, he came with "Historical Records" and "Book of Han".

"Zhonglang, "Historical Records" records that Li Bing repaired Dujiangyan, burned the rock wall with fire, poured cold water, and cracked the rocks on the riverbank alternately hot and cold. I don't think you can figure out what you said, 'medicine that can break the rocks', and you can use the burning method.

I wrote in the Hanshu. Geographical Chronicles" saw that 'Gaonu County has water combustible', that Gaonu County belonged to Shangjun in the Han Dynasty, and now it is considered Beidi County. I also asked the business traveler from Chen Cang, there is indeed this kind of strange goods to sell, the output is not large, because of the scarcity and slightly expensive, but the world also rarely buys, I take the money you gave, ask the Yongliang merchant to buy some, you see if it is useful, can it be used to build water conservancy when learning Li Bing to burn down the mountain stone? ”

Shangjun or Beidi County, located in the Hetao area, at the end of the Han Dynasty has not belonged to the jurisdiction of the thirteen states of the Han Dynasty, that place is in the north of Yongzhou, equivalent to the northern Shaanxi of later generations, and now the administrative division is the "five counties of the Xiongnu", in fact, after the Qiangqu Shan was killed, the three counties in the east were occupied by the pseudo-single Yu Xubu Guduhou, and the two western counties including the Beidi County were in the hands of the Qianghu people.

Specific to Gaonu County, in the west of Yulin and east of Yinchuan in later generations, it is equivalent to the area of the Mu Us Desert.

But in any case, the Hu people also had to do business with the Han people. The materials of Hetao Qianghu were still relatively easy to buy for Han merchants in Guanzhong.

And when Li Su saw the sample brought by Zhuge Jin, he was almost shocked: Isn't that an inferior heavy oil? It turns out that the Book of Han. It is no wonder that in the Tang and Song dynasties, the barbarians of the Western Xia people could use fierce fire oil as weapons, and they could produce a small amount of self-produced oil in the land of the Hetao at that time, and they could be self-sufficient.

Of course, crude oil is not so easy to burn directly, but a little processing, filtering the stagnant impurities, and adding other auxiliary materials to the light part still has a bit of a military future.

At that time, Li Su didn't think of any occasion to need this kind of weapon for the time being, so he didn't think much about it.

……

However, today, since he wants to help Zhang Fei find a way to break Ganning's naval warship, Li Su combed through the stirrups and gunpowder that he couldn't use in his mind, and finally keenly fixed on the fire oil.

"How do you make an incurov cocktail? The Molotov cocktail seems to be made of gasoline instead of hot oil, and it also has to add raw rubber, sugar, rags, etc.

Don't think about rubber now, it's an American crop. You can look for sugar, but I don't think I've ever heard of white sugar, I haven't even seen brown sugar......"

Thinking of this, Li Su immediately ordered people to look for sugar, and emphasized that it should be sugar made from bamboo cane.

His subordinates have long been accustomed to Li Zhonglang's "extravagant life", and they always want to rectify luxury hobbies, but General Zhenxi still spends all day drinking with him, no matter what he wants, he doesn't ask. So after some effort, his subordinates dared to get Li Su cane gum - a sticky sugar ball formed by taking sugarcane juice and evaporating it directly in the sun.

Li Su didn't know that it was not until the Sui and Tang dynasties in history that brown sugar began to be made by boiling. Prior to this, although bamboo cane and vinyl had been introduced from India during the Qin and Han dynasties, the Han people still relied on drying to produce sugar. Fortunately, sugarcane grows in the humid and hot areas of the south, and Shu is relatively close to the body poison, otherwise Li Su patted his head, and his subordinates would not be able to get sugarcane if they broke their legs.

"There's no way, it's simple because it's ugly, just take the fire oil that Ziyu asked the Qianghu merchant to buy, mix it with sugar gum and other auxiliary materials, and try it, it's not fast to burn the boat."

Li Su thought so in his heart, so he made a few monkey version of the Molotov cocktail and gave Zhang Fei a try.