Speaking of which, Lao Hei couldn't help but add a sentence about the terrifying power of heavy artillery, especially naval guns and aerial bombs, that is, the fortifications that so many of us spent so long digging were not enough for one or two shells to hit.

Let's just say that the 150 howitzer, an artillery of this level, does not rely on fragments to shoot and kill, but mainly relies on shock waves to achieve the purpose of killing.

This kind of howitzer will blow up the soil as big as a pond if it falls in the center, and people within 50 meters will basically be directly killed if there is no protection, and the corpses within 10 meters of the landing point will become fragments, so don't expect to find it.

Lao Hei came back from the Japanese non-commissioned officer school, and he had a good understanding of Japan's military industry and the firepower of the Japanese army.

Although Lao Hei constantly appealed to the military top brass whenever he had the opportunity to attach importance to the powerful long-range firepower of the Japanese army and to the development of China's long-range firepower and super artillery, those old warlords who sat in the well and watched the sky never listened to such voices, and what was the use of the soft-spoken old black.

Besides, even if the high-level attention was paid to it, China at that time could not do anything, and the backwardness of the military industry directly led to all-round backwardness, and it was impossible to make high-strength and high-tenacity artillery steel, so it could only import foreign cannons, even with matching shells, and the shells were finished, the parts were broken, and the cannons were out of gas.

There is also the backwardness of traction tools, but also restricts the development of artillery, bought heavy artillery (such as German-made Krupp heavy artillery), there are no developed cars and roads, most of them can only be disassembled with mules and horses to camels, large-caliber cannons have a gun mount of more than 1,000 kilograms, mules and horses can not be camels, how to transport quickly?

In addition, the biggest supporting thing for large-caliber artillery is air supremacy, and the cannon moves slowly, and it is most afraid of air attacks by aircraft, and without air supremacy support, large-caliber artillery can only become the target of enemy fighters in the end.

Anyone wants long-range artillery, but they can't afford it, so long-range artillery will always be a dream of the military at that time, a dream that hurts when you think about it.

What's more, most of the Chinese soldiers at the bottom have never heard of the power of these cannonballs, and they don't think so, and even think that they are alarmist, or they follow the old way of playing, and as a result, they suffered a bloody loss in the subsequent War of Resistance.

There is no way, the military industry is not good, the firepower is not enough, so I can only fill it with the number of people, I can only rely on the number of people, it is okay to hold on to it temporarily, dig more fortifications, maybe I can survive a few more, Lao Hei can only think of it so sadly.

Note: Later, on the Korean battlefield, the Volunteers adopted the methods and ideas of the Nationalist Army to surrender troops, and developed and improved tunnel tactics in order to withstand the heavy artillery of the United Nations Army.

However, Lao Hei's tunnel anti-artillery tactics that led the era for decades did not receive the attention of the high-level, and the military high-level of that era, most of their career advancements relied on the soldiers' spirit of not being afraid of death to successfully pave the way for the defeat of the enemy, so they themselves scoffed at this seemingly cowardly evasion tactic.

Lao Hei is like a Don Quixote who fought a duel with a windmill, he insisted on his theory sadly and angrily, and if the upper echelons didn't listen, he would be an instructor and teach it to the students of the military academy.

Sangou is an exception, because strictly speaking, he is still a new recruit, and his knowledge of the troops, including firepower, is a blank slate.

It is also a blank piece of paper, without the shabby experience of the previous scribbles, that he will often concentrate on learning from Lao Hei, absorbing Lao Hei's curved tunnel defense theory, and coming in handy in the Songhu battlefield later.

At that time, Sangou led his brothers to dig fortifications day and night, and the bottom of a small mountain was almost hollowed out, saving himself and most of his brothers' lives.

However, in that large battlefield where hundreds of thousands of people were killed and wounded, the lives and deaths of dozens of Sangou and their people had no impact on the overall situation, and no one paid attention to their anti-artillery experience.

They can withstand many shellings, most of the dozens of people can miraculously survive, and the superiors only attribute it to the fact that their shit luck is good enough, and it doesn't matter if dozens of small soldiers live or die, who would think so much.

……

So, Lao Hei and everyone began their careers as marmots again, moving the fortifications from the ground to the ground, digging horizontally from the trench wall, turning, and digging down, just like digging coal, while digging with wood to fix the sides and the top of the tunnel.

The excavated earth was transported out to reinforce the height of the high trenches, and most of the soil was loaded with sandbags, and the sandbags placed on the outermost part of the main position were also planted with flowers and plants, as well as vines, as a concealed camouflage position.

A tunnel can not be opened by manpower, so several tunnels are excavated at the same time, and the personnel implement three shifts, digging for a period of time to rest for a while, and another team to continue digging.

It is not that there is a lot of time to grind in training, but to improve the authenticity of training, the urgency of time, really on the battlefield, time is life, the sooner you dig well, the sooner you have the chance to live.

This tunnel is not dug for the sake of digging, but reinforced for the sake of reinforcement, in addition to anti-heavy artillery, anti-aircraft and anti-aircraft bombs, it is also necessary to take into account rainproof, waterproof, moisture-proof, fire-proof, anti-poison gas, etc.

The top fortifications of the tunnel several meters thick should be covered with waterproof rain cloth, there are not so many rain cloths, you can spread straw and hay, and then spread soil, plant plants and flowers, basically can prevent the erosion of heavy rain, which is rainproof.

The inside of the tunnel should dig out the ditch, lead the water to a low place, use the method of making a culvert, make a sewer, discharge the water out of the entire defensive position, and do the upper gate to prevent the water from backflowing, which is waterproof; Toilets can be arranged at the sewer site.

There should be some vents inside the tunnel to allow air convection, and the ground should be covered with sand, straw and hay, and then covered with soil and sand to play a drying role and prevent moisture.

At the bend of the tunnel, there is a gate or curtain, the inside is directly connected to the kitchen, there is a well, and each section of the tunnel has a storage ditch or cistern, one is to ensure that there is a supply of living water, but can be fireproof, close the gate or curtain, can be anti-virus.

Ammunition depots should be built far away from personnel to prevent detonation by heavy artillery attacks, but they should also be located in trenches that are easily accessible to facilitate the delivery of ammunition to each combat position.

Some of the usual items, such as bullets and grenades, are packed in boxes and placed on the side of the trench walls, and the boxes can also be used as tools for stepping feet.

The medical team and the infirmary were located at the rear, making it easy to transport the seriously wounded to the field hospital in the rear, but at the fixed position of each trench, there were temporary medical kits, which could also be made with ammunition boxes and drawn as a Red Cross representative.

Put some standing straps, cotton wool, hemostatic drugs, etc. in the box, painkillers, anti-inflammatory drugs are very expensive, not much, generally on the hygienist or medical officer with a point, in case you don't need it.

Of course, each soldier will bring a first-aid kit with a gauze bandage or something, and rescue them on the spot.

……