Kudu fled back to Pengshan City in one go, and when he counted the number of people, he found that although the battle was not very fierce, the losses were very heavy. Only 370 of the 1,000 new troops escaped, and only 30 of the 800 minfu returned, and most of them were taken prisoner, except for a few who died in the shelling. For Kudu, these two-legged sheep were used as consumables and cannon fodder, and when they died, they died. But only two hundred and ninety of the four hundred horsemen returned, and it made his heart bleed. In fact, there were not many Mongolian cavalrymen who died in the artillery of Changqiuzhai, and they all died on the way to escape. Yu San with the special battalion had long been ambushed on the escape route of the Mongolian army, and the cavalry not only enjoyed the welcome of mines because of their fast running, but also received warmly with muskets and grenades. On the other hand, the new annexed army and the people in the back saw the tragic situation in front, and either escaped over the mountains and mountains, or simply surrendered, and not too many people died on the way to escape.

After this battle, the Mongolian army did not go to Changqiu Village again to retaliate, mainly because it was beaten out of the psychological shadow. Kudu went to Changqiu Fort with the belief of victory this time. In his eyes, the Thunderbolts were still nothing more than a group of grass-eating peasants, relying on nothing more than firearms. Now that the dignified northern man not only has artillery, but also thunder, coupled with the invincible cavalry and archery in the world, how can he be invincible? It's just that they don't know that the Han people have a proverb that says: "People have to die more than people, and goods have to be thrown away than goods." Although their artillery is much more powerful than trebuchets and bed crossbows, it is a substandard product in the eyes of the Thunderbolt army - the gun body is full of potholes, the barrel is rough, and the pipe diameter ratio is not ......., not only the technical indicators are not qualified, but also there are serious safety risks. In Yu San's opinion, these weapons of great destruction that the Mongolian army had worked so hard to concoct were not as affordable as those horses that were blown up, and horse meat was extremely popular. And these shoddy artillery, in the hands of the Thunderbolt army, there is only one end - to return to the furnace to make iron, and they have to be pulled back to Qiongzhou with great effort.

Another reason why the Mongol army did not come to retaliate was with the arrival of spring. As if to make up for the drought in winter, the time has just entered March, and there have been several heavy rains in a row, which confirms the saying that "a long drought must have a long rain". As the saying goes, "spring rain is as expensive as oil", and these rains were especially true for the Perak army, which not only solved the drought and ensured the grain harvest, but also caused the water of the Nanhe River and Jinma River to soar, and also washed away some of the water barriers laid by the Mongolian army in Pengshan City. Although the current water level and the width of the river are not enough for the passage of the Perak heavy gunboats, the light gunboats and light frigates are now able to move freely around Pengshan City. Taking advantage of the rising water level, Le Quanan sent Xia Dagen to attack the Mongolian naval army in Pengshan City at night, burning more than 20 enemy ships. Now the Mongolian army is doing its best to prevent the Thunderbolt army from moving south to Pengshan, and it has no intention of attacking Changqiu Village again.

Although the weather was still warm and cold, the brightness of early spring and the good news that followed made Ouyang Xuan feel good. First of all, the rising water of the river greatly reduced the number of times the Mongol army smuggled across the river. The stable environment has set off a new upsurge in the construction activities of the Perak military area. Ouyang Xuan's Dayi Arsenal is close to completion, and according to the requirements of production while building, Li San'er and a group of people eat and sleep in the factory every day, which has reached a quarter of the designed production capacity of the arsenal. According to the design capacity, if the raw materials are sufficient, the Dayi artillery factory can produce about 100 light and ultra-light guns, 40 medium guns and 20 heavy guns per month; The bomb factory can produce 200 mines and more than 1,000 grenades per month; The musket factory was able to produce about 300 muskets per month. It should be noted that these firearms are all upgraded new products, and the quality is greatly improved compared with the old products, but the technical requirements are high and time-consuming. For example, the barrel is not cast but bored and milled by a machine tool, and the barrel is also drilled with a straight hole in the barrel blank using a machine tool, and then a turning tool is inserted to pull out the rifling little by little. Although the original machine tools of the Perak Army are not very efficient, they can only be said to barely meet the production requirements, but these machine tools will continue to be improved and iteratively upgraded.

Another piece of good news for the military industry is the successful development of telescopes. The production of glass is also relatively simple, that is, quartz sand, limestone, feldspar, soda ash, boric acid and other prepared raw materials are heated at high temperature to form a uniform bubble-free glass liquid, and then the glass mud burned at high temperature is put into the mold to cool. In fact, the Thunderbolts made a lot of glass before, but it was mainly used as a firing device for grenades and mines together with copper wire, and its optical performance was not high. During this time, after repeated trials and tests by the research institute, high-quality glass was finally produced, and a convex lens was polished according to Ouyang Xuan's instructions, and a telescope was made. Cao Ergou, the first batch of equipment, and Wu Qing, the commander of the reconnaissance battalion, and others were full of praise for this equipment, and praised Xuan Ge'er for inventing "clairvoyance".

The good news for the civilian industry is the commissioning of caustic soda plants. Hydrochloric acid, sulfuric acid, nitric acid, caustic soda and soda ash are the basis of the chemical industry, which can synthesize many important chemical raw materials. Before the mass production of caustic soda, the only thing that the Perak Army could produce in large quantities was sulfuric acid. With the knowledge of Ouyang Xuan University's chemical engineering major, it is not difficult to make the above compounds, but there is a lack of raw materials. For example, caustic soda is very simple, only sodium sulfate is heated together with charcoal and limestone in the furnace. When the large-scale mining of miscanthus (sodium sulfate) in Yixing Township, on the edge of Wugen Mountain, the commissioning of the caustic soda plant seemed to be a matter of course.

Compared with the above good news, Ouyang Xuange attaches more importance to the two seemingly inconspicuous news brought by Lu Dezhi. In Ouyang Xuan's view, this will have a significant impact on the future development of the Thunderbolt Army. The first piece of news is the development of textbooks. When Ouyang Xuan went to various places to teach before, Yang Xiucai recorded it and organized it into a booklet. Later, Ouyang Xuan wrote textbooks for various schools such as night schools, county schools, and state schools, but they were not systematic. Based on this situation, Lu Dezhi organized personnel to sort out the above content again, and combined with the needs of primary, intermediate and senior students, it was classified into five courses: mathematics, physics, chemistry, general knowledge, and politics, which were reviewed and checked again by Ouyang Xuan. As a basic discipline of scientific research, mathematics, physics and chemistry are very important, and Ouyang Xuan spends the most time in this regard. As for the general knowledge class, it includes medicine, agriculture, astronomy, geography and other subjects, and Ouyang Xuan, as a science student, does not know much and can only write what he knows. As for politics, it focuses on Ouyang Xuan's concept of democratic and fair governance.

The second piece of news is the development of the printing industry. Due to the war, there were not many books under the Thunderbolt army, and there was a lack of printing equipment. Rude ordered a set of movable type printing equipment to be manufactured, in which the commonly used characters were cast in copper, and the unusual characters were fired with cement. The first set of books printed by this set of equipment was Ouyang Xuan's textbook. If you want to say that Lu Dezhi really put a lot of money in the textbook, the paper used for printing is made of citric fiber, which is the paper used to make Jiaozi! Due to the high cost of textbooks and the fact that the knowledge was too advanced, Rudezhi deliberately controlled the number of copies and numbered each book to ensure that the textbooks were sufficient and not easily lost.