Since the strategic focus of defense has been set on the mountain pass, there is nothing to say next...... The development of the defense of the mountain pass is enough.

This is again the strength of our Chinese soldiers......

I may be a bit of a shame when I say that...... We are Chinese soldiers, and we don't know much about the climate and geology of Afghanistan, even if we have some understanding of the war here for a few months...... It can't be better than the Afghans!

But the construction of fortifications is a thing...... The understanding of the terrain is only one aspect, and the more important thing is to know how to build it to better play the performance of various weapons, and how to make this fortification to better defend against artillery, air defense, and anti-infantry......

You know, we've all been in war, not only in the war but also in the cat's ear holes, not only in the cat's ear holes, but also in the damp and loose soil of Vietnam.

Geologically, it would be much easier to build fortifications in Afghanistan than in Vietnam...... The reason is that Vietnam is too wet, and although the soil is easy to dig, it collapses within two strokes, especially in the rainy season, sometimes it is useless to dig a trench, and the next two days of heavy rain will be full of water, and it will not collapse to the point that it is useless.

Afghanistan is much better on this side...... Although it is more difficult to dig the fortifications, the reason is that the soil is too hard...... This is caused by a prolonged drought, just imagine...... A piece of land that has not been nourished by rain for hundreds or even thousands of years will be what it will look like.

But it is precisely because of this that the trenches are more solid and durable, and the tunnels built will be stronger and more reliable...... One of the biggest benefits is that you don't have to worry about drainage, and you don't have to worry about the tunnel being filled with rainwater or collapsing as a result.

Of course. Considering that the tunnels we are building must be anti-aircraft and anti-artillery. So it has to be supported by logs...... It wouldn't have been possible anywhere else. Mountains ...... Afghanistan It was bare, and there was not a single tree in sight for dozens of miles...... But the valley of Sigio is different, there is a river in this valley, and if there is a river, it is convenient for irrigation, and if it is convenient for irrigation, there will be a large number of plants, so the forest is also a pile here and there, and it can be used when it is cut down.

You can even say that the trees here are particularly strong...... This is also related to the hot and dry weather in Afghanistan...... There is a text in our primary school Chinese textbook that talks about the rings of trees, and if there is a year of drought. Then the rings of that year will be particularly narrow, if the rings of that year are particularly wide, it means that the rain of that year is particularly sufficient.

But...... What if there is a drought every year?

As a result, the tree grows slowly, with narrow rings each year, which means that the dense branches are particularly strong...... Don't look at it, it is only a calf-thick one, but it has to be slashed several times with an axe to break, and it is heavy in your hand. This is an excellent raw material for the construction of tunnel fortifications...... The characteristic of the tunnel is that it needs to be strong.

In addition, the soldiers had a lot of experience in building tunnels when they were in Vietnam, so they could show their skills at this time...... With an axe, he taught the guerrillas how to build A-type fortifications and T-shaped fortifications...... And what side-firing fire, back-firing fire, etc.

Among them, the more troublesome are air defense and anti-artillery......

It's okay in terms of anti-artillery...... The fortifications we built on the battlefield in Vietnam can also be anti-artillery, first of all, we must consider the direction from which the enemy's artillery is coming, and then build fortifications in its anti-slope or in the dead angle of artillery fire. This will make it difficult for enemy artillery to threaten our fortifications.

But the problem is that the battlefield in Afghanistan is not the same as the battlefield in Vietnam...... On the battlefield in Vietnam, we are fighting with the Vietnamese devils, and the Vietnamese artillery fire can only come from one direction. This is not the case in Afghanistan...... The Afghan battlefield was characterized by guerrillas using the mountains to fight guerrillas. The Soviets, on the other hand, occupied major cities and lines of communication...... And the range of the Soviet artillery is very long, dozens of kilometers at every turn, so it is possible for the shells to come from any direction. All the Soviets had to do was drive the artillery along the road to an open field, and then calculate the yuan.

Of course, it is not so simple in actual combat, Afghanistan is mountainous, and the average altitude is as high as 1,000 meters...... At every turn, there will be a high ground of three or five thousand meters...... If there was such a high ground in front of them, the Soviet artillery would have nothing to do. Especially since the place where we are is still a valley...... It can be said that there are high mountains everywhere next to it, so the chances of the Soviet artillery fire finding a gap to get in are very small, unless they find an open ground on some high ground and condescendingly hit down...... This is a real possibility, as many of the roads in Afghanistan go up and down the hill along the highlands.

These are not the things we need to consider...... Since we do not know from which direction the Soviet artillery fire will come from, we have to assume that the Soviet artillery fire will come from any direction...... Otherwise, it will be too late to change when the war starts.

But will there really be fortifications capable of defending against shells from any direction?

It's really ...... That is to build the fortifications on the ridges...... The ridge is a special place, which is what we used to call the ridge position.

The ridge line is, of course, an important military point on the high ground, and no matter which side captures this important place, it can have a great advantage...... Here, the infantry can hit the enemy with their heads outstretched, and disappear from the enemy's sight when they shrink their heads, exaggerating to say that it is a place where they can hit the enemy but the enemy can't hit us.

In fact, the role of the ridge is more than that...... The ridge line is a natural watershed of the highlands, that is, it is sloping downwards on both sides...... It's like a standing blade, and its area is almost negligible compared to a piece of high ground...... So the chance of a cannonball hitting here is also very small.

Imagine...... If a group of artillery aims at a fortification located on the ridge line and shoots a cannonball, if the shell is spread out in the center of the fortification, then at least half of the shells will go straight over the fortification because it is high.

The same is true for air defense, bullets from helicopters, missiles and bombs dropped...... At the same accuracy, the damage to the ridge fortifications is first halved.

So don't think about it, just build fortifications on the ridgeline.

Needless to say, the troubles in air defense are known...... The firepower of the helicopters from the Soviets can be said to have no dead ends, and the accuracy is much higher than that of long-range artillery, which leaves us with only one way to resist, and that is to dig deeper...... Use a thick layer of soil to withstand possible blows. (To be continued......)