At the mouth of the Lanyufen River valley in Yangqu County, north of Jinyang, a barrage dam is under construction. After the completion of this reservoir, which later became known as the Second Reservoir of the Fen River, almost all the hundreds of thousands of hectares of farmland north of Jinyang could be irrigated.

Inspecting the dam and the attached water conservancy workshop construction site really made Li Qi feel a huge sense of accomplishment from the bottom of his heart. This is the world's first reinforced concrete main structure of the dam, although many of the reservoir's cofferdams are still made of bamboo and non-concrete skeletons, which is a standard "tofu slag project" in later generations, but in this era of lack of steel, it is much stronger than earth and rock cofferdams.

With the increase of steel production, steel products are increasingly used in machinery and tools and other areas of life, with the gradual popularization of ironware, metal processing technology and tools are more and more abundant, some primitive lathes, drilling machines and hydraulic forging machines and other metal processing machinery are also used more and more.

The level of science and technology and production technology in China, which had been developing slowly, has once again shown a trend of accelerated development, which has laid a good start.

Students from Jinyang Academy, including Zhou Tingyu, Chong Sheng and Shi Mian, are surveying along the side of the mountain, and the main canal leading from the Fenhe Reservoir will lead directly to the south of Jinyang City, so as to solve the problem of water for daily life in Jinyang City and agricultural irrigation water in the southern suburbs of Jinyang and Qingyuan.

The agricultural civilization is more advanced than the grassland civilization in that the construction of various water conservancy and irrigation projects has increased the efficiency of water and land use by several times, and greatly enhanced the ability of human beings to resist natural disasters.

Due to the construction of the Fen River dam, coal ships sailing along the Fen River were blocked, and a coal market was slowly formed on the official road not far from the dam. There are a large number of coal mines along the Fen River, such as Gujiao, Loufu, Lanzhou and Xianzhou, and Jinyang has a large population, and the main fuel for daily life and heating in winter is coal and stone produced in these places.

At dusk, Zhou Tingyu and others returned to the academy against the instruments, and saw a large group of students panting in their mouths, lying weakly in the grass next to the playground of the academy. From the north, exhausted students dragged their heavy legs back to campus one after another.

Zhou Tingyu walked in front of Li Jiyu, who was covered in mud and pale with a pale face, and stopped and asked, "What's the matter, it's all so embarrassing?" ”

"Yuan Ren, this guy is back!" Li Ji rubbed his sore legs and said with a wry smile.

"Patriarchal Demon? It's really not easy, what did he do to everyone? Zhou Tingyu raised his head and looked around.

"That bastard asked all the third-grade students to walk thirty miles, and when they came back to the coal market, they carried fifty catties of coal back, and they were not allowed to take the official road, and specially demarcated the path along the foot of the mountain, which was the ...... we measured a few days ago."

Zhou Tingyu smiled, squatted down and whispered: "This is what you asked for, it is not appropriate to let a good prince go, you have to take the path of a general...... "He spent the winter with Zhou Guangfu in Longshou Mountain Hot Spring Manor every winter when he was a child, and he and Li Ji were childhood playmates. Li Ji used the pseudonym Li Tong in the academy, and there were not many people who knew that he was the prince, and Zhou Tingyu was one.

Li Ji's eyes were red after hearing his words: "My mother was forced to death by Li Siyuan, and I want to take revenge with my own hands!" ”

"Let me tell you, when we graduate, maybe the emperor boss will already kill Li Siyuan, and it is not your turn to take revenge, it is a pure waste of effort."

"You don't understand...... When I was in the Luoyang Palace, everyone was running away, and no one cared about me in the palace, I was crying and crying, and no one cared about it, that kind of despair...... Later, an old eunuch really saw that I was pitiful, and took advantage of the chaos to secretly take our brother out of the palace and send him to General Yuan's mansion. Li Ji said, "Later, I heard that this inner prisoner died at the hands of the mountain bandits when he was protecting Jisong and them to escape......

"Well, you choose your own path, just don't regret it in the future...... I'll have to get the instrument back first, and I'll talk about it in the evening. Zhou Tingyu said helplessly, reached out and patted the poor prince in the future on the shoulder, stood up, and walked towards the courtyard of the academic affairs institute with the bracket.

Xi Yuanren, the chief teacher of the academy, is back, and everyone will definitely not have a good time this winter.

……

Over the years, the Ganzhou Hui have become stronger and stronger, robbing passing caravans, blocking the trade routes of the Western Regions, and sending troops to attack the Guiyi military town in Shazhou three times, and the first emperor also specially canonized the Yingyi Khan...... I don't want to admit this khan. After listening to Zhang Quan's report, Li Qi spoke.

"Our plan is to first provoke a fight between the Liangzhou army in Hexi and the Hui in Ganzhou, and then the imperial court will send troops to crusade against the Hui, which is also justified." Zhang Quan said.

"It's just an excuse, it doesn't matter what the truth is, they have robbed a lot of caravans over the years, just find a caravan from the Western Regions to come out and complain." Li Qi smiled, "It just so happens that in the past two years, I also plan to make a stable transition with the south and the Khitan, and I will personally conquer Hexi in the next spring, just for a long-distance training." ”

"You don't need Your Majesty to do this kind of thing, you just need to send a general to lead the army." Ren Yuan, as the prime minister, got up and stopped after hearing this.

"Since the Anshi Rebellion, the subjects of Hexi have not known about the Son of Heaven in the Central Plains for a long time, and I went to Hexi in person this time, just as a compensation for the previous dynasty for these Chinese brothers who fell into Hexi. Hexi has been separated from the Central Plains for a long time, and those people have not seen the brilliant Tianwei of the Son of Heaven in the Central Plains for hundreds of years, I am afraid that they have forgotten it, and this time it is a thought for everyone," Li Qi said indifferently.

"Logistics is a big problem for the labor expedition, and you need to prepare in advance." Yuan Xingqin said.

He did not object to the conquest of Ganzhou, for the soldiers, the recovery of the old frontier is also the work of opening up the territory and expanding the territory, which is the largest of all the credits, and it is easy to leave a name in history.

"With Lingzhou as a logistics base, it will take almost enough time to transport and hoard grain and grass in one winter." Li Qi said, "Is it appropriate to set the specific departure time after the spring sowing next year?" ”

Yuan Xingqin thought about it in his heart: "It should be about the same, the road from Yunzhou to Hetao, after several years of renovation, is quite smooth." ”

Li Qi smiled: "When the cavalry arrives, it will cross the border from Xiazhou, so as to deter the restless psychology of the Li family." The cause of this incident may be their doing. ”

After the decision was made to send troops to recruit Hexi Huifu next year, the transfer of grain and grass to Lingzhou in winter became the focus of this military operation. While discussing the details of the dispatch of troops, the Privy Council and the Ministry of War were immediately busy.

Although the route from Yunzhou to Lingzhou via Hetao is relatively far, it is relatively smooth......