It was necessary to block the entrance. Otherwise, once the enemy came to sweep through, the base would be exposed in front of them. At that time, they could only transfer the people, but they could not transfer the property such as houses. If the Japanese couldn't find him, they would definitely burn houses everywhere. Especially since Su Yang had built a factory in the base, it was even more impossible to move.
Therefore, the only choice was to block the entrance.
The ultimate tower defense!
They used fortifications to fight the Japanese head-on.
After some construction, the mines, cement factories, and steel factories were put into production. The logging and wood processing factories were also put into operation.
The base had formed an industrial capacity of 1500 tons of cement and 1000 tons of steel per month.
The engineering team had already completed the construction of the railway in the base area. The steam locomotive brought the train carriages and began to operate in the base area, transporting all kinds of mineral resources and wood to the Chen family town and then producing them in the factory.
The operation of the factory had engineers and technicians as the backbone. A large number of workers were recruited from the villages, and the factory started to operate smoothly.
The workers in these factories were the key literacy areas, especially the young people. After literacy, they would be arranged to learn skills and build related factories in the future. Su Yang would not have to buy engineers and technicians from the system.
Although the carbon-based IAs that Su Yang bought were not as intelligent as ordinary people, they were not a problem in teaching skills. On the contrary, they were very professional. They were like intelligent learning machines. Although they couldn't teach learning methods, they were very good at explaining techniques and knowledge points.
As long as he arranged for a group of elite scholars to learn, it would be too easy for them to master the technique. History had proven time and time again that the Chinese had the strongest learning ability in the world. In terms of IQ, the number of people in China with an IQ of more than 125 was definitely the highest in the world.
The biggest problem in China was that due to the ruling style of the Qing Dynasty, the intelligence of the Chinese could not be turned into productivity. As long as Su Yang organized a group of highly intelligent scholars to invest in the industry, with the talent and diligence of the Chinese, it would not be a problem for them to understand these advanced technologies.
At this time, Su Yang had a large amount of cement, steel, wood, and an engineering team. In addition to the terrain of the Changbai Mountains, all the conditions to block the entrance were met.
Su Yang immediately organized the people of the base and began to build fortifications in the narrow areas of the north and south entrances of the base.
After Su Yang personally inspected the terrain, he came up with a plan to build fortifications.
There were only two purposes for building fortifications in such a narrow terrain. One was to block the enemy outside, and the role of the fortifications was to prevent the enemy from bombarding and shooting, so as to ensure the safety of their own firing points and personnel.
The base was located in a relatively wide river valley with mountains on both sides. There were two narrow exits in the north and south of the river valley. The distance between the mountains was 120 meters and 180 meters.
The method of blocking the entrance was very simple. They would directly pull barbed wire and mines at the entrance. After that, he would dig a tunnel on both sides of the mountain and dig out a space from the mountain. This space did not need to be very big. It was enough to arrange two combat teams and store food, ammunition, and fresh water.
Blocking the entrance in such a terrain and setting up a crossfire net could make the Japanese feel like dying. This was because the enemy's artillery and heavy machine guns could not do anything to the crossfire.
The reason why crossfire was so terrifying was because they used the method of shooting from the side. The enemy's heavy firepower could not hit them at all.
Many people had the impression that the firing point of the fortifications was to fire directly at the enemy, but that was not the case. If you faced the machine gun directly at someone, even if you were hiding in a bunker and firing an eye-catching shot, the enemy's bullets could still enter through the eye-catching shot. Moreover, you could directly use the cannon to blow up the machine gun.
On the other hand, the crossfire net was shot from the side, and the muzzle was not aimed at the enemy's front. The enemy would attack from the front, with machine guns placed on the sides, and the front facing the enemy would be covered. When the enemy rushed to the side, the machine gun would start to kill the enemy.
The reason why they formed a crossfire net was to cover each other.
Two machine guns, or even multiple machine guns, formed an X-shaped fire net. For example, if the enemy attacked in the direction of →, then a fire net of →X would be formed. The machine guns would be placed at the edge of the reverse slope, and the enemy's artillery shells would only fly over the mountains, so they would not be able to directly hit the crossfire points. The enemy's machine guns in the frontal attack direction would also be unable to do anything to the crossfire points.
Unless the Japanese used their cannons to close in and launch a high angle of fire, but the distance had to be very close. The Japanese's artillery positions were exposed to the enemy. As long as they had artillery, they could fire at the enemy's artillery and immediately take out the enemy's artillery.
Su Yang did not have any powerful cannons at the moment, so he only obtained two 75mm infantry cannons. Therefore, Su Yang used the actual terrain to design a more tricky crossfire.
This crossfire was an X→X pattern of fire distribution. The first layer of fire was fired from the back, which was equivalent to the position where the enemy was about to pass through the first layer of fire. The first layer of fire was fired from behind the enemy, and the other directions were all covered by cover. The enemy would not be able to hit this firing point from the front. As for the second net of fire, it was at a crazy angle. From the edge of the reverse slope, it could only hit a position about 50 meters in front of the first net of fire, thus forming a fire cover for the first net of fire.
It was equivalent to an X-shaped fire net covering each other, and two X-shaped fire nets covering each other.
The first barrage of firepower was covered by the mountain, and the interior was reinforced with logs and reinforced concrete. Even if the Japanese brought their heavy artillery over, it would be useless. The artillery shells could not penetrate the mountain and could only cause the internal space to collapse. Therefore, the fortifications in the internal space were mainly for reinforcement and not for direct confrontation with the heavy artillery. It was just like an earthquake-resistant building, as long as it could withstand the shock of a cannonball hitting the mountain.
Besides setting up machine guns at the entrance of the valley, as long as a few people were stationed there with a few Bosha submachine guns, they could form a powerful firepower network. After all, the entrance of the valley was not very wide, and the range of the Bosha submachine guns could also block a certain distance.
In order to strengthen the defense ability, Su Yang directly used an excavator to transform the terrain of the valley entrance.
There were originally hills on both sides of the mountain. Su Yang had dug out two ten-meter-long cliffs from the hills, and the fortress was located on the cliffs. This way, the Japanese soldiers would not be able to climb up. If they wanted to use a ladder to climb up like a siege, they would be thinking too much. A casual sweep of the submachine gun would kill a large number of people.
If the Japanese infantry wanted to attack from the mouth of the valley, they could only charge forward without any cover. Even if they brought heavy machine guns to the front of the net of fire, the machine guns would be useless. After all, they had no cover and had to prepare to shoot. They would have long been killed by the firing points of these cliff fortresses.
Such fortifications were definitely a one-man stand against ten thousand men. They could easily defend it with forty to fifty militia members.
Moreover, this kind of thing did not require much work. It was not as big as digging a tunnel, and the technology was not that difficult. He directly used a tunnel-digging drill to drill a tunnel from the back of the mountain with a very small amount of construction. Then, he drilled the tunnel to the front of the mountain and built a fire point fortification. Then, he dug out a small house-like space inside the mountain. Then, he used wood and concrete to strengthen the tunnel and the internal space.
Compared to digging tunnels, the amount of construction was not much. Su Yang could repair these blockages in a few days with the equipment used to drill tunnels.
This book comes from：m.funovel.com。