Lan Cheng.

Xue Dongting didn't die, Shi Dekai didn't die, and the officials of the state and county governments all survived.

But this was only temporary, because Luo Daniu and Liu Youzhu didn't have time to pay attention to them, so they only locked them up.

After Emperor Guan's army captured the city, it took two days to raid the large households in the city and roughly screen the prisoners, and almost all the large households were raided, and a total of more than 13,000 stone grain and more than 70,000 taels of silver were confiscated.

Among them, there are several families that have been officials and generals for generations, and there is also a right deputy envoy of the third grade, which was also copied, and several clansmen who desperately resisted were all cut off their heads.

There were not many soldiers in the city, only about 400, and there were more than 700 people in the courtyards of large families.

After a rough screening, these soldiers and the villagers of the courtyard were cut down for many evils, and those who were still willing to be soldiers were reorganized on the spot by Luo Daniu and Liu Youzhu and temporarily listened to them.

After the end of the Northwest Raid, these troops will have to go through a period of training, and after erasing the shortcomings of most of the Ming army, such as loose military discipline, ruffianism, laziness, and numbness, they can be officially incorporated into the Guan Emperor Army.

Those who do not want to continue to serve as soldiers will wait for resettlement on the spot, and they will be given land to rent and plant.

On the third day of breaking the city, Emperor Guan's army left the city of Lan in two ways, among them, Luo Daniu led 1,500 first camps, 200 reserves and 200 surrendered troops, and went north with Xue Dongting's seal letter, first opened the gate of Wuzhai Fort by fraud, captured Wuzhai Fort, and continued to go north after only one day of rest, sending 200 troops to enter Sancha City, and captured Sancha City with both inside and outside.

Then, Luo Da Niu will continue to go north, take Lougou Fort, Yongxing Fort, and enter the Biaotou Pass.

Liu Youzhu led 1,500 Wudang battalions, 200 reserves and 200 surrendered troops, and marched to the northwest with Shide Kaiyinxin, and met with Feng Yilong under Baode City, and after bombarding Baode City for three days, the city guards took the initiative to open the door and surrender.

After resting for two days, the two continued to move north along the Yellow River and besiege Hequ City.

This important military town on the side of the Yellow River, an important port of Jin-Shaanxi and Mongolian commerce, has been plagued by war since the fourth year of Chongzhen, has been captured twice by the Liukou, the city wall has long been dilapidated, there are few people in the city, and many piers on the riverside have long been razed to the ground by the Liukou.

After careful discussion between Liu Youzhu and Feng Yilong, they decided to attack with water.

The Guan Emperor's army knew nothing about water attack, but there were many merchant ships and fishermen around the meander, and there were not many boatmen and fishermen.

Liu Youzhu and Feng Yilong temporarily recruited all the boats and boatmen they could find, mounted dozens of guns on the bow of the boat, advanced the river meanders from the surface of the Yellow River, bombarded the officers and soldiers along the river meander, bombarded the officers and soldiers, and then docked, landed, and the river meander.

Next, Liu Youzhu and Feng Yilong will go north again, first take Yangtu Fort, and then join Luo Daniu to divide the head pass, and capture the most important strategic position in the northwest of Shanxi.

At the same time as the soldiers and horses of these three roads went north, the construction team was also divided into two roads, all the way to Baode City, all the way to Baode City, recruiting people in the local area, panning sand and selecting stones, repairing Baode City, and building four protective turrets around the city to strengthen the city's defensive ability.

The construction team also sent some craftsmen and people to transport reinforced concrete to Hequ City, and began to rebuild the military town and build a port.

In the future, the city will be an important transit point for Mongolian trade routes.

The other construction team advanced to the northeast, preparing to rebuild the military fort around the Inner Great Wall.

……

Qin Chuan did not kill Jiang Jiu, Wen Buyou and others, but sent people to send letters to their families and asked them to ransom them with food.

Among them, Jiang Jiu has 1,000 stone of grain, and Wen Buyou has 500 stones.

Jiang Hao was born in a Jiangmen family, a native of Yanchuan County, Shanxi, the Jiang family has been a general for generations, and he also has two brothers who are also in the general army and generals.

Although Wen Buyou is not from a family of generals, he is also a local son of a strong man in Shanxi, and his family is also not short of money and food.

On the day of the capture of Ningwu Pass, Qin Chuan sent Qin Boyang, Zhao Lishan and others, who had just surrendered, to lead 500 soldiers to open Yangfangkou Fort 25 miles to the north.

This military fort is the key pass of the Inner Great Wall, and it is also the northern barrier of Ningwu Pass and Yanmen Pass, and an important gateway to the north and south.

The 1,500 Ming troops in the military fort became prisoners, and after the persuasion of Qin Boyang, Zhao Lishan and others, they were basically subordinated to Qin Chuan, and Wang Pi, the general who guarded here, was pressed to Ningwu Pass, and Jiang Xuan, Wen Buyou and others were locked up.

Qin Chuan spent two days screening the surrendered troops, and scattered all these surrendered troops, some of them were sent to Ninghua Institute and Jingle City, and some of them were directly sent back to Lou Fu for training.

There were less than 1,000 people left in Ningwu Pass, and 500 people in Yangfangkou Fort, and these people had to be trained every day so that they could use some combat power when Jiannu arrived.

Qin Chuan also sent people to Shuozhou, took over the families of the surrendered troops, and arranged for the reclamation of farmland in the area from Ningwuguan to Jingle.

Two days later, Qin Chuan sent Li Dingliang, Hu Hai, Li Renjiu, Qin Boyang, Zhao Lishan and others, who had just surrendered, to carry Jiang Huang's seal letter and lead 3,000 men and horses to advance northwest along the Inner Great Wall.

By means of deceit, surrender, internal response, and strong attack, he successively captured many military forts such as Shenchikou, Yijingtun Fort, Wuzhou, Limin Fort, Octagonal Fort, and Daworming Fort, and finally entered Laoying Fort.

Qin Chuan also sent hundreds of troops from Lao Huang Ling to Luya Mountain to control the Malun Army Horse Farm.

The meadows of this horse farm are more abundant than the Genting Mountain horse farm, and these subalpine pastures grow several times higher than the pastures of the Mongolian steppe, and the meadow on the top of the mountain at an altitude of more than 2,000 meters alone has more than 6,000 acres, plus the surrounding gentle slope meadows, more than 20,000 acres of meadows can be grazing.

This place is also to be enclosed as a military horse farm.

Qin Chuan stayed at Ningwu Pass and presided over the defense and the expansion of Yangfangkou and Ningwu Pass.

The city wall of Ningwuguan is three feet and five feet high, the bottom is more than four feet thick, the top is two feet and three feet thick, and the bricks are three feet.

Qin Chuan didn't plan to rebuild the city wall for the time being, because the amount of work was too large, so he only built two protective turrets in addition to the two zhang of the east, west, north and south four city walls.

This kind of fortress is circular, five zhang in diameter, three zhang and five feet high like the city wall, divided into three layers, the foundation should be dug one zhang deep, the wall is two feet thick, and the whole is poured with reinforced concrete.

There are six holes in the walls of each floor, twelve holes, but no doors.

Because the turret and the city wall are only two zhang away, between the top floor of the turret and the city wall, there is an overpass, which is built with dozens of logs, which is convenient for transporting soldiers and ammunition, and also facilitates retreat, if the turret falls, it is also convenient for the soldiers to retreat, and destroys the overpass.

After the completion of these eight turrets, they will form a three-dimensional intersecting firepower network with the city wall, which will greatly improve the defense capability of Ningwu Pass.

Yangfangkou Fort because it is close to Changfang Mountain in the east and Huihe River in the west, and there are only two city gates in the north and south, so the terrain is very dangerous, easy to defend and difficult to attack.

However, this is only an earthen city, the city wall with a circumference of two miles is all rammed earth, and there is no brick, and the city wall is only two zhang high, if you want to rebuild, you can only build a new city wall outside, and the amount of work is very large.

Qin Chuan thought about it for a long time, and decided not to build Yangfangkou Fort first, but only put a small number of sentry troops there, and when the enemy attacked, he would retreat to Ningwu Pass.

He was not afraid that the Ming army would reoccupy it, because Jiannu was coming, and that low earthen city would definitely not be able to stop Jiannu.

……

When the northwest strategy was advancing step by step, Wen Cheng, Wang Jizong, Niu Sanchun and others also led some officials from the Department of Officials and the Department of Household Administration to the north and began to establish the internal affairs system of the various prefectures and counties they had just captured.

Among them, Lanzhou is not only an important military place for the defense of the north, but also an important tuntian land for the army in the northwest of Shanxi, starting from Sanjing Town in the north of the state city, to Shenchikou in the northeast 80 miles, and then to Sancha City in the northwest 80 miles, there are nearly 400,000 acres of cultivated land on this large triangular small plain.

Originally, most of these cultivated fields were tuntian fields of the border army, which belonged to more than a dozen military towns and military forts in the northwest of Shanxi.

However, after years of desolation, coupled with the continuous encroachment of military officers and local officials, there are now less than 100,000 mu of military land, most of which are barren land with scarce water sources.

Wang Jizong once sent people to survey this land boundary and came to the conclusion that in addition to the existing 400,000 mu of cultivated land, this small plain can at least one million mu of cultivated land.

However, there is a serious problem with this cultivated land: lack of water.

There are no rivers that flow all year round, and there are many seasonal streams, but in dry years, these rivers are not watered for a few days a year.

In other words, the hundreds of thousands of cultivated land are completely dependent on the weather, and a lot of grain can be produced in years with plenty of rain, and it is possible that there will be no harvest in drought years.

In this regard, Qin Chuan, Wang Jizong and the officials of the household administration department formulated a complete set of agricultural development plans after a long discussion.

This is a huge and protracted project, based on environmental transformation, to build a large number of reservoirs and reservoirs, to deepen the channels of dozens of seasonal rivers in the territory, has achieved the purpose of water storage.

Moreover, all the mountains in the territory should be renovated with greening.

Although the soil erosion situation on the Loess Plateau is not as serious as that of later generations, and the environment around Lanzhou is not as bad as Shaanxi, it is not much better, and the trees are cut down to build houses, used as firewood, and grazing without control, etc., so that many of the mountains around the small plain are bare.

In the areas of Xingxian, Baode Prefecture and Hequ County, the degradation of vegetation and soil erosion are even more serious, and in some places there is not even a single tree within a radius of tens of miles.

The way to renovate is simple: mandatory planting of shrubs and trees.

People in all counties, villages and towns are required to plant trees every year.

Because of the large demand for groundwater, a large number of shrubs and pastures such as sheep firewood, bush clover and satawang will be planted in large quantities in the early stage, and trees such as saxon trees, willows and spruce trees can be planted directly in areas near the Yellow River or other rivers with sufficient groundwater.

With vegetation, soil and water can be maintained, and when there is a large area of vegetation cover, the transpiration of plants will increase the moisture content in the air, and the precipitation in the area will also increase.

When the overall ecology gradually recovers and the amount of precipitation gradually increases, the land will gradually become fertile.

Qinchuan's plan is to green the entire northwest region in his lifetime.

This is a far-reaching, protracted, and costly mega-project, and it may take 10 or 8 years to see a little bit of success, and it should be able to take shape in 30 or 50 years.