Soon, with the engineering team as the main construction force, coupled with Su Yang's mobilization of the people in the base area, a large number of earth works began on the ridges on both sides of the valley.
With the support of the engineering team's equipment, the construction efficiency was very high.
The commoners in the base mainly helped to transport supplies.
Su Yang bought another 20 small excavators from the system store at a price of 30 points each. Excavator mechanics were also cheap, requiring only 30 points to hire one.
Although the price was cheap, it was very expensive. Su Yang had to buy a large amount of fuel from the system store.
These excavators allowed the base to quickly build mountain roads (dirt roads) from the slope to the top of the mountain, and then use various vehicles to transport cement, bricks, steel bars, and wood.
At the same time, the commoners helped to pick up the soil and construct the tunnel. The scene was lively.
The fortifications on the front and back slopes of these ridges were quickly built.
Su Yang was so busy that his feet could not touch the ground. He personally inspected every position. He had designed the fortifications for each of the positions.
Because there were sufficient materials, manpower, and equipment to carry out the construction, these fortifications were designed by Su Yang to be extremely abnormal.
There were also a large number of anti-slope trenches on the front slope. These anti-slope trenches were constructed with a large amount of reinforced concrete or natural terrain.
At the same time, Su Yang directly built the military station and ammunition depot inside the ridge, so there was no need to place them on the reverse slope. This way, it was mainly to prevent the Japanese from using cannons to close in and shoot at high angles.
The Japanese had also used this tactic of using the front and back slopes to fight in the tunnel during World War II. In the end, they were beaten up by Ying-chan, trapped in the tunnel, and had a barbecue feast by Ying-chan's fire-breathing soldiers.
The Japanese were also very good at tunnel warfare. The rabbit army in the original time and space had learned a lot of tunnel warfare skills from the Japanese. However, the Japanese had clearly not fully grasped the essence of the tunnel warfare in World War II, which was why they were defeated by Ying-chan. After the rabbit army learned how to fight in tunnels, they continued to explore and create new tactics. Therefore, when Ying-chan used the experience of fighting against the Japanese in tunnels, it was useless. Instead, she suffered heavy casualties.
The weakness of this kind of tunnel defense that used the front and back slopes was the control of the ridges.
The ridge line was the line on the top of the mountain. If the enemy's artillery was placed on the ridge line, it would be equivalent to firing from the side. It could hit the front slope or the back slope. It was equivalent to a position with a balance of yin and yang, which could be yin or yang.
Su Yang did not have any cannons at the moment. He simply took out a space in the mountain ridge and stored his troops and ammunition in the mountain. Or they could find an absolute blind spot on the irregular ridges and store their troops and ammunition there. After all, the ridge was irregular and not a straight line. On a main ridge line, there would be many branch ridge lines. The enemy was firing from the side, and there was a reverse slope on the side.
At the same time, in order to strengthen the control of the ridge line, Su Yang also built watchtowers and firing points on the ridge line.
These watchtowers and firing points were connected to the tunnels below. Since the internal space had solved the problem of artillery defense, the remaining problem was the Japanese infantry's attack.
The infantrymen were most afraid of the fire-breathing soldiers. If the fire-breathing soldiers blocked the tunnel, it would be a barbecue feast.
However, the Japanese didn't seem to be equipped with flamethrowers at the moment, so he didn't have to worry too much. However, Su Yang still built the ventilation equipment and bought a lot of exhaust fans. He did not have to worry about the problem of electricity. There was a thermal power plant in the base. At the same time, Su Yang also equipped the tunnel with a diesel generator and a gas mask.
Although the Japanese did not have flamethrowers, they had poison gas bombs.
The watchtowers on the ridge were used to observe the enemy's movements. Because these tunnels were connected to each other, there was no need to foolishly deploy manpower in every place when defending. Instead, they could flexibly mobilize troops according to the enemy's movements.
The firing points on the ridge were used to attack the enemy infantrymen who ran to the ridge. At the same time, they would provide cover fire at the entrance of the tunnel to prevent the enemy infantry from blocking the entrance of the tunnel. That would be awkward. However, the Japanese infantry's firepower was relatively poor, and the threat of blocking the entrance of the tunnel was not too great.
At this time, Su Yang decisively stopped the Sparrow Battle and transferred all the troops to carry out the soil excavation work.
Earthwork was an important part of modern warfare, especially in the first half of the 20th century. Su Yang taught them step by step. Every night, he would teach the soldiers of the anti-coalition army the tactics and layout of the tunnel warfare. During the day, everyone would hold an engineering shovel to carry out the soil work.
In addition to building a large number of tunnels on the main ridge and the branch ridge, Su Yang also calculated all the possibilities of the Japanese. In order to prevent the Japanese from launching a small assault, Su Yang simply built crossfire points with the mountain as cover in those narrow mountain passes.
Even though it was unlikely that the Japanese would launch a small assault, since they were also using a line tactic and their infantry was not strong, they still had to be on guard. Perhaps the Japanese were forced into a corner and evolved the tactics of the rabbit army?
The rabbit army's small assault and flexible tactics were originally used by the Germans in the First World War. They found that it was useless for the soldiers to attack in a line. Not only was it difficult to conquer the position, but they also suffered heavy casualties.
As a result, the Germans began to attack with small elite units. They found that not only were the casualties low, but they were also very effective in dealing with trench warfare. However, the Germanic players did not further develop such tactics. The rabbit army's small-scale assault tactics were obviously not learned from the Germanic people. Instead, they had summed it up after many battles and developed this tactic to the extreme.
The construction speed of the fortifications in the base was extremely fast. In fact, many fortifications were just for insurance. However, Su Yang had high-efficiency tunnel boring machines and other excavation equipment in his hands. He had already built this fortifications to the point of 'insanity.' The Japanese were not familiar with the terrain, so they might not cross the mountain to attack.
After sealing the entrance, they could basically resist the Japanese's attack.
Su Yang was looking forward to the Japanese's big sweep. In order to build these fortifications, he had bought a lot of equipment. Now, he was so poor that he did not even have 500 points on hand. He was just waiting for the Japanese to give him a wave of points.
Just as Su Yang had expected, the Japanese were preparing to sweep through the base and had already prepared a regiment of troops.
Fujikawa Genji was in charge of the sweeping mission. He tried to figure out the situation in the mountains first, but after sending out a group of spies, none of them succeeded in infiltrating the base.
Su Yang's base was only so big. The people in every village knew each other. They knew who was good and who was bad. These spies could not even enter the base, let alone spy on intelligence.
Although Fujikawa Genji had locked onto the location of the base, he still had no information about the anti-alliance forces. He only knew that the anti-alliance forces were equipped with many ZB-26 light machine guns and Mauser 98K. He had no idea about the existence of MG-42 machine guns.
However, even these ZB-26 and Mauser 98K sniper rifles made the Japanese feel like they were being stabbed in the back. They were eager to destroy this armed force, or there would be no peace.
After the spies failed one after another and could not provide any more information, Fujikawa Genji finally could not hold it in any longer and decided to immediately launch a large-scale sweep.
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