In addition to the naval army and the fortified fort, the immigrants were also an effective means of defending against the Mongol army. The establishment of a large number of cantonment points at the junction with the areas controlled by the Mongol army can not only provide the defenders with grain and grass, as well as auxiliary military support such as vigilance and reconnaissance, but also take advantage of the slack time to plant fast-growing forests and thorns, and dig a large number of criss-crossing trenches to delay the movement of the Mongol cavalry. Chengdu and Han Peng are densely networked with rivers, especially suitable for growing rice, and there are many ponds and lakes for fish farming and marshes for taro, and if you add dense irrigation canals like spider webs, it will become a nightmare for the Mongol cavalry. Judging from the large number of reclamation points along the Jinma River and the Nanhe River, this management model of integrating farming and warfare has an extremely significant effect on the defense against harassment.

Jiading Province and Meizhou can attract people from the surrounding Yibo tribes, but the two prefectures are rich in products, fertile land, and extremely high land carrying capacity, so the number and demand of the surrounding mountain people attracted are simply a drop in the bucket. It is obviously not possible to rely on the local population alone to build these reclamation sites, so in addition to increasing the clearance of hidden populations and attracting displaced people, the Perak Army has also introduced preferential policies for people from Chongqing Province and Qiongzhou to visit. It's just that the risk coefficient of these reclamation sites is significantly greater than that of Chongqiong and even Yazhou and Jiadingfu, so there are not many people who voluntarily go there. In desperation, Li Shuang had to draw lots and selected more than 60,000 people from 20,000 households to Chengdu Prefecture and Penghan Prefecture for reclamation. For example, Cao Ergou's father-in-law, Qian Jia, and Lu Wen'an, the eldest son of Lu De, moved their families to Shifang and Mianzhu respectively, and even Yang Yan moved the headquarters of Nanyang Company to Chengdu.

When the people saw that the top leaders of the Perak Army took the lead in moving to the border states and counties, they naturally followed suit. In fact, they also knew that Chengdu Province and Han Peng Prefecture were the core of the anointed land, and that the degree of wealth was no less than that of Chongqing Province, but they were only worried about safety. Now that the top management of the Thunderbolt Army has sent all the family members over, what are you worried about? Seeing this, Li Shuang lost no time in increasing the preferential policies, such as free rationing of iron tools and farm tools for farming, interest-free loans for the purchase of cattle and piglets, barefoot doctors and teachers given priority to the reclamation sites, and even providing free building materials. As a result of these measures, the number of applicants soon reached 100,000 within a few days, and the number of applicants had to be stopped. Many people who did not report their names regretted this, and even beat their chests in frustration.

In the early stage of development, due to the majority of coal, iron and lime mines under their rule, and the captured prisoners of war and bandits and other criminals could not let them sit idle, the Thunderbolt army accumulated a large amount of coal, iron and limestone. After reaching a strategic cooperation agreement with Miaojiang, although part of the iron production capacity was digested, due to the distance, the trading volume between the two places could not digest the surplus production capacity at all. Therefore, although Jiamei and Chengdu Penghan also had a boom in fortress construction and reclamation points, the demand for building materials increased greatly for a while, but there was no shortage of building materials. Li Shuang also organized people to continuously transport building materials such as iron nails, cement, and lime from Qiongzhou, Dayi, Chongzhou, and other places through waterways, and there were also a large number of limestone and bamboo and wood resources in the local area, so the military and civilian construction projects in various state capitals were relatively smooth. The only limiting factor is the problem of insufficient labor, and Li Shuang is helpless about this problem, after all, the population problem has its natural laws, and it cannot be solved in the short term. Fortunately, Ouyang Xuan ordered the local garrison to transfer manpower to help the construction of military fortresses and cantonment points on the premise of doing a good job of defense.

In fact, it was the middle of August, which was the time of the scorching heat in western Sichuan, and the weather was very hot, so it was not the best time to start construction during the rainy season. It's just that for the Thunderbolts, time is an extremely precious thing, and they can't wait for the weather to cool down before acting. Because there are still more than 20 days, it is the autumn harvest season. Although Jiading, Meizhou, Chengdu, and Penghan Prefecture experienced wars, due to the relatively short period of time, the crops were not seriously damaged, and more than 5 million mu of grain still needed to be harvested, while more than 4 million mu of grain fields needed to be harvested in the pre-war jurisdictions such as Chongqing Prefecture and Qiongzhou. Although this season's autumn harvest can guarantee a year's worth of grain, the Perak Army's top brass has decided to carry out large-scale land reclamation after the autumn harvest and strive to cultivate 12 million mu of land under its rule, and to plant wheat and rapeseed, peas, broad beans, and other crops. It's a daunting task.

After the autumn harvest, thunderbolt is not only an important thing to open up wasteland and farm, but a lot of things, the first of which is "autumn prevention". The so-called autumn prevention is to prevent the Mongols from plundering in autumn and winter. The hot and humid summer in western Sichuan made the Mongolian soldiers who had lived in the north for a long time extremely uncomfortable, so every year when the autumn was cool, the Mongolian army would take advantage of the fat and strong horses to burn and loot everywhere. Western Sichuan, which is rich in grain and horses, is naturally the first choice for the Mongol cavalry, and at this time, the water level of the river will drop significantly, and the movement of warships will be greatly restricted. In order to maintain water conservancy facilities and ensure a bumper harvest in the coming year, and to reduce the adverse impact of the drop in water level on the "autumn prevention", after the autumn harvest every year, the Perak army organizes personnel to dig ditches and weirs and dredge rivers, and also digs trenches and traps in shallows that are easy to wade across the river, so as to prevent the Mongolian army from wading across the river as much as possible.

The second most important thing after "autumn prevention" is the construction of new industrial sites. At present, the military and mining industry in Perak is mainly concentrated in the mountainous area between Chongqing Province and Qiongzhou, followed by Liuqiu Island far overseas, and Banzhou is also a part of it, but the volume is very small. The construction of industrial sites is first of all safe and secure, followed by rich minerals and raw materials, and convenient transportation, preferably beside waterways with large volumes. Ouyang Xuan thought about it again and again, listened to the opinions of Li Shuang and Li San'er and others, and prepared to build two new industrial points - Jiading Industrial Point and Pengzhou Industrial Point.

There are also many mountains and valleys near the steep terrain of Jiading Mansion, which are easy to defend and difficult to attack and easy to keep secrets, so the safety of building a factory here is guaranteed. There are also a large number of coal, iron and other mines in the surrounding area, which has the foundation for industrial development. What's more, the waterways of Jiading Fu are extremely developed, not only to Xulu and Chongqing, but also to Yazhou and Lizhou waterways, with large transportation volume and low cost. The bulk raw materials used in the Chongqing and Qiongzhou factories even need to be transshipped through this. After the establishment of the industrial site in Jiading, the bulk commodities of the Perak Army were transported to Banzhou and Yali Prefectures, saving a lot of distance. Ouyang Xuan decided not only to establish a complete industrial system in Jiading, but also to build a large arsenal.

The topography of Pengzhou is similar to that of Dayi, which is close to the water and mountains and is very convenient by land and water, with waterways leading directly to Hanzhou and Jintang. Ouyang Xuan planned to choose the arsenal on the side of a mountain not far from the city, and built a fortified city similar to Hengyuan Fort to protect it. Pengzhou in the development of industrial resources, even more abundant than Qiongzhou's resources, there is the whole of Sichuan is scarce copper, although the reserves are far less than the copper mines in Dali, but can also greatly solve the dilemma of lack of copper. The Perak Army will also establish a complete industrial system here, and will also build an arsenal more advanced than Dayi to mass-produce copper-shelled bullets and also trial production of copper cannons. Although copper is more expensive and heavier than iron, its barrel can be cast thinner than iron cannons, and it has better ductility, and its performance is better than that of iron cannons, which is more labor-intensive.