The Song Dynasty used troops to Tubo through Zhao Zhen's plan, and the plan could not be temporarily changed as long as it was within a bearable range. This is a taboo on the battlefield.

It is true that mobilizing the Huaide army to garrison Maerdan was beneficial to the Song Dynasty, but the price required was not worth the loss. Tens of thousands of Huaide army were dispatched to the Huaide army. The people along the way were eating horses and chewing them. With the time of garrison, the manpower and material resources the court had to spend exponentially.

Zhao Zhen would not make such a low-level mistake. Five thousand well-equipped Divine Guards were on board with 800 artillery artillery. Zhao Zhen believed that without the siege of 70,000 to 80,000 Tubo army, Ma'er would never fall.

Any enemy army will suffer a devastating blow when attacking the city of Maerdan. The Yong'an Army and most of the Divine Guards left, but there are many things left. With the continuous supply of materials to Maerdan, it can be said that the five thousand defenders here can be permanently stationed in Maerdan.

Even if Jiao Siluo knew that Zhao Zhen was in Ma'er, he would not dare to use troops easily. Once the army attacked Ma'er, the cities would basically be over.

The crazy Song army will do its best to serve the king, and will also launch a fierce attack without reservation. What Jiao Siluo wants is to survive rather than destroy or attack the location of the Song emperor, not to mention that he doesn't know who is in Ma'er dares.

For the Tubo people, Maerdao is just a supply level for the Song army. If it is a strong attack, it will not be worth the loss.

Zhao Zhen stayed in Maer to obtain the frontline battle report as soon as possible. It is much faster here than in the territory of the Song Dynasty. The experimental data on large-scale firearms will appear on his desk as soon as possible.

Wang Shao's attack and every attack of the city and the village are conducting experiments. These practical exercises are divided into multiple stages, and each stage will have different means.

The scientific and rigorous attitude is what Zhao Zhen admires most. His ability to master the use of firearms in the Song army is inseparable from such rigorousness.

If a firearm wants to equip the army on a large scale, it cannot be separated from mature and stable command. As for the various tactics derived, it is also extremely complicated.

If you want the Song Dynasty's firearms to be the most effective in different wars, you must rely on a solid foundation and rich practical experience, and even Wang Shao is still doing it while exploring.

Weapons change tactical ideas, which is an experience summarized in later generations, but Wang Shao has discovered the problem now.

Using different weapons will bring various changes to the Song Dynasty's army. The emergence of artillery slowed down the speed of the entire army, which is the most obvious point.

This is especially true in high-altitude areas like the plateau. Transportation and equipment are completely different. The logistics box chariot army of the Song Dynasty can transport artillery to Maergan as fast as possible, but Wang Shao's Yong'an army and the Shenwei army cannot quickly have subordinate artillery on the battlefield.

The Song Dynasty currently does not have professional horse-drawn artillery, and ordinary axles cannot withstand the weight of the cannon. Even though the Song Dynasty artillery is much lighter, it still needs a wide box truck to drag.

The craftsmen of the Geju Academy had long thought of installing axles and wheels on the cannons, but the axles of the Song Dynasty were still at the level of the Tang Dynasty. Although they used metal axles, they still needed a car driver to bear the load.

Installing wheels directly on the cannon requires a durable and durable one, mainly to be able to directly withstand the pressure of the cannon body.

These are all problems that need to be solved. Of course, some old artillery in the Song Dynasty were equipped with wheels, but those were all because the guns were too heavy, and the shooting direction must be adjusted and the recoil was reduced. However, those wheels were not for transportation.

The only thing Zhao Zhen could do in Maerdan's city was to wait, and then study rolling bearings through a pair of equipment brought by Cai Boyi.

The so-called rolling bearing is a precise element that turns the sliding friction between the running shaft and the shaft seat into rolling friction, thereby reducing friction loss.

Although he was not able to make too precise rolling bearings in this era, Zhao Zhen understood the principle of this thing. When he was young in his "last life", he often played with the old man who repaired bicycles and dismantled his own bicycles. He knew exactly what the rolling bearings looked like.

The most important thing is that Zhao Zhen knows what principle is used to reduce friction by rolling bearings.

The small thing is composed of four parts: an inner ring, an outer ring, a rolling element and a cage.

The function of the inner ring is to cooperate with the shaft and rotate with the shaft; the function of the outer ring is to cooperate with the bearing seat and plays a supporting role; the rolling element is the small steel ball in it, which evenly distributes the rolling element between the inner ring and the outer ring with the help of the cage.

The old man who repaired the car once said that the shape and number of steel balls directly affect the service performance and life of the rolling bearings; the cage can evenly distribute the steel balls and guide the rolling element to rotate and lubricate.

Knowing the principle and structure, the rest should be much simpler, repeating continuous experiments, manufacturing a lot, and screening.

What seems simple is actually a huge project, and it takes enough time and patience to complete it slowly.

To accomplish all this, a simple lathe is needed, and Zhao Zhen has already thought about the power to drive the lathe, passing through the water of the curved river.

When Maer dared not be absolutely safe, Zhao Zhen would not bring the steam engine of the Song Dynasty here. For Zhao Zhen, the steam engine was the biggest secret and treasure of the Song Dynasty.

Of course, rickshaw lathes can also be used, but they are not as good as hydraulic power. The Zequ River is the upper reaches of the Yangtze River, and its origin is in the Tanggula Mountains.

The Maergan City is located on the west bank of the Zhequ River. It is easy to borrow water power. Not only that, the craftsmen and laborers of the Song Dynasty had already thought of this when they were building the Maergan City. They opened a canal to divert water to Maergan City, but the project volume was a bit huge and had just been completed the day before yesterday.

The machinery brought by Cai Boyi has been installed. The huge water wheel is installed on the canal through a rotating shaft. After the gate is opened and the water wheel is slowly rotated under the action of the canal water, and the speed is getting faster and faster, and finally it starts to drive the robot arm.

In fact, according to historical development, pedal lathes should be the first product to appear. The principle is the same as that of sewing machines. Sewing machines have appeared in the Song Dynasty. After all, pure mechanical objects are not difficult for skilled craftsmen like the Song Dynasty.
Chapter completed!