In order to resist foreign enemies, the Central Plains ethnic groups have more or less been operating the Hexi Corridor, the throat of the Han Dynasty.

As the only pass leading to the Central Plains in the Western Regions, a large number of military buildings were built between Yumen Pass and Yangguan, but with the passage of time, most of them were eroded and dilapidated by the years.

Coupled with the arid and rainless natural environment of the place, the geology is mostly sand and gravel.

Not to mention the large blocks of hard rock, even the loess with good adhesion that can be used to build rammed earth walls is very rare.

This made it more and more difficult to build a fortification, and it was not necessary to expect the walls to be so imposing, and it would be nice to have an earthen dam that could slightly stop the nomadic cavalry from entering.

After the Tang Dynasty disintegrated the eastern and western Turkic forces, it pushed the frontier defense westward, and stationed 5,000 soldiers in Yumen Pass and Yangguan in the Dunhuang area.

At the same time, in order to attack Tuyuhun, Dangxiang, Tubo and other places, the Mercenary Guild also set up a Dunhuang branch here, which echoes the Zhenbei branch of Yunzhong City and Yuanlou Town, one west and one north, so there is still a large number of mercenary combat power here.

As a result, the already relatively poor living environment became more and more embarrassing, and many mercenary teams could only set up temporary tent camps, which caused a lot of complaints.

But complaining is complaining, and everyone can understand the difficulty of Datang's territory expanding too quickly and the lack of manpower leading to the difficulty of infrastructure construction.

The [Tiangongmen] infrastructure corps is already working hard to repair it, but the project cannot be completed in a day, and there must be a process of gradual outward expansion.

This time the foreign enemy invaded, and the Tang Army and the auxiliary corps, which had originally rushed to the Korean Peninsula, were all in the process of transferring troops from the east to the west.

Once the army arrives, it is believed that the city defense on the front line of Yumen Pass and Yangguan will receive an earth-shaking improvement.

But Bai Yuqi, who vaguely felt that this Western Regions invasion army was a little weird.

Worried that the slow-moving large army would not be able to build a defense even if it arrived, he planned to complete the infrastructure first.

Unlike the last time I rushed to Northern Xinjiang, I had to save mana in the Ao Neng vacuum environment.

Bai Yuqi, who has obtained phlogiston crystals and has risen two levels in a row, can be said to have greatly improved the strength of the shotgun for artillery, so naturally there is no need to be picky.

As Bai Yuqi ascended to the beacon tower of Yumen Pass, the Tai Sui incarnation separated from him and began to divide continuously.

Countless figures flashed and disappeared, spreading outward along the defense line of Yumen Pass, and a white vortex avatar appeared every ten miles.

[Extreme Super Magic: Reshape the Earth]!

I saw that the original rammed earth walls and gravel walls melted like butter on a hot pan, and turned into soft mud and flowed.

Whether it is sand, gravel or the Gobi, it has been transformed into a clay belt about five miles wide.

Then the next moment, these extremely sticky and malleable dirt rose from the ground with a roar.

Under the shocked gaze of countless border guards, it turned into a majestic Great Wall about ten zhang high, about six zhang and six feet wide, stretching for hundreds of miles!

[Combined Spellcasting.Multiple City Builders]!

Not only the towering city walls, but also a medium-sized acropolis with an inner and outer urn city every 10 kilometers, and a small fortress guarded by the Meihuawu Fort every 10 kilometers, these defensive buildings are like a string of steel-cast iron chains, and the iron locks lock the entire Hexi Corridor like a river!

Bai Yuqi and Tai Sui incarnate shot together, naturally it was impossible to just build the city wall.

In the wall-like building with Bai Yuqi's consistent design style, there are barracks, warehouses, armory, and even bathhouses, toilets and other living facilities.

Under the city walls, there are military camps, school fields, horse rings, as well as various supporting facilities such as markets, inns, houses, and restaurants that are very distinctive on the Silk Road.

Moreover, the large area of transformed land in the Kannai was covered with greenery in an instant, and the vertical and horizontal canals were trickling.

An artificial water system built on the basis of a natural water source is sufficient to water the land, and there is a huge reservoir connected to the underground water veins.

The Gobi outside the Yellow Sand turned into a piece of the Jiangnan in an instant, and this kind of miracle of heaven and earth recreation directly stunned countless border guards.

As soon as the gods make a move, they will know if there is one.

The towering stretch of the city and the military buildings along the route, although not overly decorated.

It is only shaped with [turning mud into stone] and reinforced with [solidified rock mass] and [steel lithography].

However, the monolithic building, which retains the original color of the rock, is majestic and heavy, and exudes a majestic atmosphere from the inside to the outside.

With a height of 30 meters and a width of 20 meters, it may not be anything compared to the Xiongcheng that Bai Yuqi had built before, which were 100 meters high at every turn.

Compared with the Burning City on the other side of Yingzhou, which is about 1,200 meters high and covers an area of about 80 square kilometers at its base, it is even more insignificant to the extreme.

But don't forget, the majesty of the Great Wall lies not in its height but in its length, and you can imagine how spectacular it is to have a 30-meter-high monolithic wall of pure rock that spreads out for hundreds of kilometers like a giant dragon.

Regarding the craftsmanship that became more and more proficient when building the wonders by himself, Bai Yuqi nodded with satisfaction.

Even Li Shimin, who has seen a lot of miracles, can't help but be shocked by this spectacle scene and can't come back to his senses for a long time.

As the general of the defending army, Cheng Yanjin stared at the copper bell with big eyes, and he was speechless with a dumbfounded half-sound.

Not to mention anything else, just arranging for soldiers to take over and defend these acropolis and fortresses was enough for him to work for a long time.

The two cities of Yumen and Yangguan, which are at each other's angles, are separated by hundreds of miles, but they are only guarded by 10,000 soldiers.

If it doesn't matter in peacetime, it can be placed in the current situation when hundreds of thousands of enemy troops in the Western Regions are coming, but it is really too weak.

Especially in the case of His Majesty the Emperor's personal presence, in order to ensure Li Shimin's safety, Cheng Yanjin did not dare to disperse his forces to the defense line...... Therefore, what kind of drive does the emperor have nothing to do, and what kind of sign does he pro?

Bai Yuqi has a way to solve the problem of insufficient troops, such as summoning the Regeneration Heroic Spirit Legion on the side of the "Great Cold Underworld" to top one first, and then sending them back after the Tang Army arrives.

However, there are disciples of the [Royal Beast Gate] who are outside to monitor the movements of the enemy army.

Bai Yuqi, who knew that the enemy army in the Western Regions would not be able to defeat him for a while and a half, didn't bother to bother with that effort.

Anyway, in a few days, the nearest reinforcements will arrive, and the slower Eastern Expeditionary Army will climb in half a month.

If they have two transportation lines, rail transit and land transportation, and they can't outrun the enemy army in the Western Regions who have traveled a long distance, then they deserve to be invaded by Datang.

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