After assigning the defensive areas of each unit, the next step is naturally to build the fortifications of their own defense areas.

There are a total of 50 reinforced engineer platoons directly under the regiment, and each of the four squads is responsible for the guidance and construction of anti-slope tunnels for a defensive position.

Wu Chenghu, the engineer platoon commander directly under the regiment, knew as soon as he looked at the terrain that the regiment had previously trained in the anticline tunnel, and it was completely prepared for this mountain defensive battle. While marveling at the regimental commander's extremely accurate precautions, he confidently shouted and commanded several infantry company commanders who were one level higher than him to lead the soldiers to dig tunnels.

Except for the commander of the regiment, he is now an authority, and no one can deny this.

The ridge line, that is, the main position on the top of the mountain, was also placed by Liu Lang in front of the Great Wall. In the era of cold weapons, the sergeant can use the height of the battlements and the wall to kill the opponent with a bow and arrow as long as he stands on the city wall, but in the era of hot weapons, it can only be a joke to put the fire point on the city wall, the enemy with aircraft and cannons can turn the city wall and people into rubble, and the huge city wall is simply the best target for aircraft and artillery.

In order to prevent being injured by the masonry splashed by the explosion on the city wall, Liu Lang had to push the main defensive position on the top of the mountain forward by more than 20 meters, and took the initiative to blow up several gaps in the city wall so that the soldiers on the main position on the top of the mountain could quickly retreat to the tunnel behind the mountain.

However, when Liu Lang came back from inspecting the entire defense line and saw the soldiers on the main position on the top of the hill in full swing and the trenches that had just been dug out, not only did his head shake. Is that basically a straight line trench to be bombarded to death by the Japanese artillery?

Their understanding of field fortifications was still too little, and they would surely be ashamed to see the trenches that crisscrossed the Five Holy Mountains twenty years from now that no one familiar with them would get lost.

"Call me all the people above the rank of company officer, and stop the trench digging first." Liu Lang ordered.

Before the officers gathered, Liu Lang pulled out the military thorn and drew a simple field fortification configuration map on the frozen hard land, and when he saw that everyone had arrived, he said: "Last time, I told you about the importance of the ridge line for the anti-slope tunnel, and the position on the top of the mountain is the ridge line. In the back mountain of the base, the area of the top of the mountain is only a few hundred square meters, and it is no problem for your trench to use a zigzag with an arc, but the mountain here is slightly flat, and the slope of the top and slope of the mountain is extremely gentle, if the enemy attacks it, you lack enough depth, so we can't follow the script, but should adapt to local conditions. ”

Seeing that a few company commanders still looked confused, Liu Lang had to continue to patiently explain: "So our main position on the top of the mountain must also use sufficient defense in depth and arrange it in echelons. For example, the deputy of the Chi regiment, Luo Wenyu's main position, he is a battalion with three infantry companies for defense, then, on the first-line position, only one company is placed。。。。。。 ”

Liu Langjun slid up on the fortification layout and continued: "Push back thirty feet, use the slope to establish a second line of defense, and here, put another company, which can not only protect the two flanks of the position, but also act as a second line of defense. ”

"I know the regimental seat, protect the two wings of the position, but what's the use of leaving reserves?" Sheng Lei, the commander of the fifth company who was responsible for the defense of Hawthorn Valley, asked.

This question is a bit white, but Liu Lang is not angry. Those who can become the commanders of 6 infantry companies are the best officers of the independent regiment, but after all, many of them are only raised from a small platoon commander or even platoon deputy, and they are still new to the layout of the position, otherwise Liu Lang would not have to give lectures on the position temporarily.

"That's a good question." Liu Lang said. "Blindly defending is by no means a real defense, the real defense should be an attack in the defense, leaving this company as a reserve, in order to prevent that in case of the loss of the main position, we can launch a counterattack at night to recapture the position, during the day, the Japanese army has planes in the sky, there are artillery on the ground, we can't kill them, in order to reduce casualties, we can withdraw to the tunnel behind the mountain, use the position there to resist them, and wait until night, the devil's plane can't fly, and the artillery has to catch blind, at this time the night battle starts, Little devils may not be stronger than us. ”

"In order to prevent the main position from being exploited by the enemy, remember that all trenches should be 1.8 feet deep, and the sandbags on the breastwork should be 2 feet, and each firing position facing the enemy should be built with an earthen platform not more than half a foot high, facing our position." Liu Lang continued.

"Tuanza, why is that? In the 2-foot-deep trench, we can't even shoot our heads! It's not convenient to get a dirt platform to step on, isn't it? A company commander asked in surprise.

"Let me ask you, are you tall or are you tall?" Liu Lang sighed.

"We must be tall! Although the little devils are very stocky, their average height is a little shorter than our soldiers, but we are not even tall for those Sichuan recruits. Sheng Lei interjected.

"So! Think about it, our soldiers have to stand on that earthen platform to shoot outside the trenches, and what if the little devils who have attacked the trenches don't have an earthen platform for them to stay on when they want to shoot at the second line of defense? Guess how they will react? Liu Lang said with a smile.

"Haha, then they're just jumping and shooting out." Everyone burst out laughing.

The fat man's move is too ruthless, even if the first line of defense is lost, the devil who enters the trench will not be able to attack the second line of defense thirty feet away, and the second line of defense can rely on the advantage of height to throw grenades into the trenches as much as possible, just thinking about that situation, don't be too happy.

"Tuanza, can we still take advantage of this, give up the first line of defense from time to time, lure them in, and then make an urn to catch turtles?" Moving his gaze forward, he suddenly suggested.

"This idea is good, but you have to pay attention to the actual operation, and concentrate on the shell guns and flower traps issued to your company to annihilate the devils who strayed into the trenches, and also, you have to guard against the devil commander jumping over the wall to indiscriminate shelling, it doesn't matter how the devil dies, but none of the officers and soldiers of my independent regiment are bleeding in their hearts." Liu Lang nodded and reminded with a smile.

"Also, the fortifications of the three infantry platoons should be built in a curved ring, and they should be spread out longitudinally, and each ring should be connected by communication trenches, and each ring position should have a communication trench connected to the second line of defense, so that after the first line of defense is lost, it can quickly retreat and rely on the second line of defense to block it, and the two wings will be left alone, and handed over to the second line of defense.

Moreover, put several heavy fire points of the company's machine gun platoon in the bunker, and forbid to make a few sandbags like them, thinking that it was safe, and the Japanese artillery was not vegetarian. The top of the bunker must be covered with steel plates, logs and soil layers, which must be at least able to resist the strength of the Japanese 155 howitzers, and the firing holes of the bunker must be reinforced with lime and steel plates, and at the same time ensure that there is no dead angle in front of the bunker that can be shot by our infantry, and the bunker tunnel should be connected to the infantry trench, and it can be quickly withdrawn if necessary.

At the same time, it is necessary to build individual anti-artillery holes in the trenches, and to be able to prevent 81-caliber mortars, if I find that who is lazy in the next inspection The specifications of the individual anti-artillery holes are not enough, then don't blame me Liu Lang for not giving face, let you Dalian commanders be whipped in front of the soldiers with bare butts, and those who are tired of teaching and do not change will be engaged in military law. Liu Lang confessed solemnly.

The reason why Liu Lang attached so much importance to the positional defense artillery was because, according to post-war statistics, 60 percent of the 3 million soldiers killed and wounded by the Nationalist army were killed or wounded by various artillery of the Japanese army, and as many as 70 percent of the hundreds of thousands of Japanese soldiers killed were killed by the shells of the Nationalist army.

When the enemy does not attack, all the troops withdraw from the main position and hide in the anti-slope tunnel behind the mountain, and wait for the observation post to see that the enemy is attacking before entering the position on the top of the mountain. On the contrary, curved guns such as mortars, which move and fire quickly, can accurately send shells to the trenches without injuring the soldiers they are attacking after effectively correcting the ballistics, so individual artillery bunkers and anti-artillery holes are necessary.

"Yes." All the officers hurriedly stood up and agreed in unison.

"Hurry up and get out of here to repair your fortifications, as for who is the first-line troops, who is the second-line troops, and who is the reserves, I suggest that it can be solved by lottery." Liu Lang was afraid of his ass and left directly.

Drawing? Is that okay? The company commanders looked at each other for a few seconds, and then suddenly scattered.

If you don't hurry up and work, if you are whipped by the bare buttocks of the group, it is really better to be counted directly by military law.