(Thank you for the reward, thank you for your monthly pass, stick to zuihou, and you must finish this book carefully.) ）

Science and technology are the primary productive forces.

This sentence is changed to more than 2,000 years ago, and it is also a truth that cannot be broken.

In addition to the rigor and advanced nature of the Legalist system, there are the factors of the sixth Fenlie and the first emperor, but the more important thing is that the Qin State is ahead of the opponents of the Six Nations in many fields such as agriculture, handicrafts, and military manufacturing (military manufacturing).

In terms of agriculture, the dredging of the two major water conservancy projects of Zhengguo Canal and Dujiangyan provided sufficient grain supply for the conquest of hundreds of thousands of troops of the Qin State.

In terms of handicrafts, Xianyang, Linxia, Yiqu, Didao and other Qin cities had professional workshops, and the products produced and processed by them were trafficked to the farther west by merchants from the Western Regions and other places, thus bringing additional profits to the Qin State, and after these revenues were obtained, they were uniformly distributed to the operation of the entire state apparatus, and Zuihou contributed to the great cause of the unification of the Qin State.

On the contrary, although the six countries of Kwantung also attacked in this regard, the national economy and trade under the control of the four princes, no matter how much interest they had, only supported thousands of guests under their doors, so that there was another country outside the country, and the weakness of the country was in stark contrast to the wealth of the four princes of Pingyuanjun, Xinlingjun, Chunshenjun, and Meng Weijun.

Zuihou a military manufacturing industry, needless to say, the Great Qin soldiers are famous all over the world, each weapon, there is the name of the craftsman, the time of manufacturing, the personnel who supervise the production, this production line is no different from the factory of later generations, and the traditional master with apprentice model on the side of the Six Kingdoms can obviously not compete with it.

Of course, these are just the glory of the Qin State in the past, in the face of the Xiongnu, a powerful opponent in its heyday, if the Qin State is only satisfied with this progress in the past and does not want to forge ahead. At best, the result of the Qin-Hun struggle for hegemony can only be a defeat for both sides, and at worst, it will be like the great Han in history, and he has to be humiliated again and again to "make peace", and exchange a humble attitude for time to recuperate.

The development of science and technology will inevitably bring about the improvement of comprehensive national strength, and the upgrading of the military industry, especially the weapon, will be able to give strong support to the new Qin in a short period of time.

At that time, the crossbow representing the highest level of bronze weapons supported a rapid Qin army, and the Qin army was guided by unified weapons, supplemented by strict military discipline and brave soldiers who could sweep through the pass. Help them sweep through the Six Kingdoms and achieve Great Qin.

But all this does not mean that the Qin State can rest easy. After the opponent was replaced by the Huns, these advantages of the Qin army were still there, but they were no longer obvious.

Now, the new Qin urgently needed another epoch-making military innovation to help the Qin army officers deal with the toughest opponent of the Cold Weapon Era, the Hun cavalry.

The horse guerrilla tactics of the Huns were like the German submarine Sea Wolves in World War II. Tracking all the way and biting all the way, no matter how powerful the bronze crossbow arrows of the Qin army are, there will always be a day when they will be shot out, and at that time. The soldiers of the Qin army with their bare hands could hardly have any chance of winning in the face of lightning-fast horse knights.

Of course, with the advance application of saddles, harnesses, and horse shoes, the performance of the Qin cavalry on the battlefield was not much worse than that of the Huns. But how long this equilibrium can be maintained, Li Yuan is not sure.

After all, things like saddles, harness, etc. In other words, as long as a Qin soldier is killed or captured by the enemy, it is possible that it will be imitated by the enemy, in which case, the Qin army will fall into a disadvantageous situation.

Therefore, from a long-term perspective, the Qin state must have a killer weapon that surpasses all the opponents of this era, and it is the invention and use of gunpowder.

Two years ago, Peng Sheng "unexpectedly" used the "Heavenly Fire" that he occasionally discovered while guarding the frustrated sailors, and this discovery was not realized by the officials of the Qin State when it was presented to Li Yuan's case, and this was a major discovery that could affect the course of history.

Fortunately, Li Yuan was not the mediocre emperor in Chinese history who finally made gunpowder into fireworks, and his personal experience has a deeper understanding and knowledge of gunpowder than anyone else in this era.

After Peng Sheng was promoted to the second division of military construction, he put the greatest effort into the development of gunpowder formulas, especially in the development of explosive gunpowder with great power, but there is an old saying that is good, but speed is not enough. Peng Sheng's impatience didn't allow him to make much progress in the expected time point.

The small "Tianhuo" army that accompanied Ji Bu and Ji Xin to the Western Regions was all the achievements of Peng Sheng in two years, and the so-called "Tianhuo" was just a simple innovation in black powder, and its power was not much different from the firecrackers of later generations.

Of course, with the sound and power of firecrackers, at best, it can only scare the war horses of the Huns, and once the other party gets used to this new thing that is very loud but actually not very lethal, the effect of "heavenly fire" is not so great.

How to make gunpowder a member of the Qin army's arsenal is a difficult problem in front of Li Yuan, and it is certainly unrealistic to expect Peng Sheng to do it behind closed doors, so in the past two months, Li Yuan has taken the opportunity to confuse the Huns, secretly arrived at Fushui, and concentrated on pointing out Peng Sheng and a master of military construction.

Under the auspices of Sima Yin, with the help of the abundant open-pit coal and stone resources in Yunzhong and Hedong, coupled with the wrought iron craftsmen who were incorporated into Handan and Xiping, Jinyang made it to the forefront.

At present, the large-scale refitting of the Qin army has come to an end, except for the special arms such as the border army, which are accustomed to bronze machine crossbows, most of the main field forces of the Qin army are equipped with iron weapons, and only the local county soldiers, the temporary young men in the county, and the errand soldiers of the township pavilion are still using the replaced and eliminated bronze weapons.

In contrast, the Fushui military construction is the most mysterious, especially after the accidental invention of gunpowder, Li Yuan mobilized the Yulin troops of the forbidden army and classified the Fushui area as a military forbidden area.

This time in Fushui, Li Yuan personally explained some of the knowledge he learned from the Republic Army to Peng Sheng and others, these knowledge in the 21st century, is just some popular things, as long as Baidu can know, but in the Qin period, these purely theoretical things made Peng Sheng and others frightened.

"King Wu, sure enough, he is a king appointed by the gods, and he can even know these profound conclusions that I don't know how many attempts it takes to get to-!" Peng Sheng was frightened, and his heart fluctuated.

Knowledge, even if it is a sponge that absorbs water.

These days, Li Yuan is like a teacher, helping Peng Sheng and other students to understand the relevant knowledge of physics and chemistry little by little, and when they try to take risks again and again, Peng Sheng and others are surprised from the beginning, to the habitual, and then to Zuihou's inferences, these simple Qin people return to Li Yuan, is a surprise.

September 7.

A day that is worth remembering forever for the Qin people.

In the deep mountains in the western part of the Qinling Mountains, the craftsmen of the Fushui Soldiers finally succeeded in developing the "Tianlei" explosives with good reliability, stability and practicability after 318 shiyans.

Heavenly thunder and heavenly fire.

A word difference. Its power is not the same.

Skyfire, at best, is an ignition device capable of breathing fire and making small explosions that can scare horses within a certain range.

The thunder is filled in a clay pot, in addition to the proportioned black powder, there are tiles, stones, copper clusters and even blinding white ash, etc., these things are tightly filled together, and then use twine as the fuse, in battle, the canister soldiers can hide behind the shield soldiers, pikemen, and when the enemy rushes to the right distance, ignite the twine and then quickly throw it.

This method of warfare is somewhat similar to the grenade of later generations, of course, its power is impossible to compare, however, the role of the thunder is not mainly to kill how many enemy soldiers, but through the sudden explosion, the enemy horse is panicked, so that the enemy horse into chaos.

This time back to Chang'an, along with Li Yuan, there were nearly a thousand Tianlei soldiers who had undergone special training, these young soldiers from the forbidden army, in the deep mountains of the Qinling Mountains, overcame unimaginable difficulties, some of them, before the application of this new weapon, lost their young lives in Shiyan.

In the process of production and application, there are still many defects in Tianlei. For example, the fuse problem can now only be replaced by twine. This is due to the fact that cotton in the real sense has not yet spread from the Indian Peninsula and the Arabian Peninsula to China, in the area south of Bashu, there may be kapok, but in the Central Plains, there is almost no such thing as cotton, and the people's clothes are mostly linen cloth and kudzu cloth, while the rich merchants and nobles are mainly brocade forging and silk.

The stability of twine burning is lower than that of cotton thread. The main thing is that the ignition point is unstable, sometimes it burns too fast, causing the thunder to explode before it can be shot, and sometimes because of the twine moisture or other reasons, the fuse is extinguished when it burns half or is about to take over the entrance of the clay pot.

Under the lessons of blood and life, the makers and designers of Tianlei have explored the infinite mysteries of new science and technology with the rigorous attitude of an ancient scientific explorer.

Under the expectation of the people of Qin, Li Yuan, the king of Shenwu, finally returned to Chang'an.

In the face of the large-scale invasion of the Xiongnu, he will personally conquer the Hetao, and he will lead the soldiers of the Qin army to recover the lost territory occupied by the Xiongnu and rescue the compatriots who are struggling to survive under the iron hooves of the Xiongnu.

Great Qin!

Dignity cannot be trampled on.

In the new Qin State like the sun rising, a group of soldiers of the Qin army will use victory to prove their strength and glory. (To be continued......)