(I cried stupidly by myself, my wife and children came to Weihai to play in the past two days, and I saved the draft for two days, and I was ready to accompany them, but the timing was wrong, and it was released in advance, so I had to take the time to run out and code a chapter today...... Four thousand a day for the last two days, forgive me! ）

On this day, Di Renjie rushed to find Li Su.

And didn't tell Li Su what happened, but pulled him out.

On the way, Li Su couldn't help but ask, "Renjie, are you making a new invention again?" Anyway, if you have researched any new products, don't sell them! ”

It is impossible for scientific research institutes to move forward under the guidance of Li Su all the time, and in that case, the meaning and value of scientific research will be lost.

So, now in addition to the products that Li Su needs them to make, Li Su has let go.

What new products they want to research and what direction they want to develop, Li Su doesn't even ask.

They always have to go through failures and setbacks before they can gradually get on the right path.

This time, Di Renjie was so excited, Li Yu could guess it immediately.

Needless to say, it must be their research institute that has successfully developed a new product.

And this new product must not be the subject of the light bulb and battery he researched for the research institute.

Nowadays, there are quite a few people in the research institute, and they will probably divide into several topics for research.

If it was to study the light bulb, the topic would have been raised by himself, and Di Renjie would not have been so excited at all.

Also, I am afraid that the light bulb can not be made in such a short time.

was guessed by his own master, although Di Renjie was a little disappointed, but he was not too surprised.

It's really normal to be able to guess the reason by your own demon master, and you can't be stepped on, that's a weird thing.

However, Di Renjie was secretive about what new products had been researched by scientific research institutes, so he refused to say it.

"Master, guess!"

Li asked with a dark face, "Do you guess me?" ”

Di Renjie smiled and said, "Don't guess!" ”

"Master, it's coming soon, you'll see it soon, don't worry, it will definitely surprise you!"

Not long after, Di Renjie pulled Li Su to the courtyard of the scientific research institute.

The courtyard of the research institute is very large because sometimes it is necessary to study some strange things.

And there is still ground in the yard, and the test of the steam plow can be completed in the yard.

And when Li Su walked into the yard, he saw a tricycle.

The scale of this tricycle is relatively large, and Li Su feels that this tricycle can carry at least fifty or sixty people on it.

Even in later generations, there are no such big tricycles, right?

This is definitely a superstar tricycle!

And the tailgate of this tricycle is very thick, and it seems that it can still be erected.

Seeing this tricycle, Li Su couldn't help but show a thoughtful look on his face.

"Renjie, this tricycle is used in the military?"

"Wow, master, you guessed that...... The master is so powerful, he can't hide anything from the master! ”

This is the steam tricycle they made, right?

In the previous time, Di Renjie proposed to build a steam tricycle like Li Su, but was vetoed by Li Su.

Because Li Su knows very well that there is not much market for steam tricycles.

After the advent of the internal combustion engine, the steam tricycle would soon be retired from the stage of history.

But what Li Su didn't expect was that the scientific research institute still developed a steam tricycle.

However, this time the steam tricycle is used in the military.

Such a steam tricycle, because of its huge size, the steam engine used is also large, which perfectly avoids the shortcomings of the steam tricycle proposed by Li Su before.

"Ignit, start, let the master see the speed of the steam tricycle!"

"Yes!"

It turned out that on the steam tricycle, there were three people on standby.

Among them, one person drove and two were responsible for lighting the fire.

Soon, the flames ignited, and with a loud roar, the steam tricycle rumbled and ran.

They must have been burning for a while before they came, otherwise they wouldn't have been able to run so quickly.

And the speed of the steam tricycle can be described as lightning.

Li Su felt that he could at least have a speed of sixty or seventy miles.

This speed, although in a short period of time, is not comparable to the speed of war horses.

But when it comes to staying power, it will definitely be able to throw off the war horse for several streets.

By the way, I don't know how far the range of this steam tricycle is.

Li Su couldn't help asking: "Renjie, how far can this steam tricycle run at one time?" ”

Di Renjie smiled and said, "Master, according to our tests, this steam tricycle can run at least one hundred and fifty miles at a time, and then you need to add water and charcoal." ”

"Of course, in fact, water and charcoal can be loaded with more water and charcoal to increase the range. However, this will affect the performance of the steam tricycle. The current ratio should be the optimal ratio. ”

After hearing Di Renjie's words, Li Su couldn't help but nodded.

After the steam tricycle turned off, Di Renjie pulled Li Su to the tricycle.

Well, the height of the tricycle is much higher than the height of the two, and at the bottom, you can't see the whole picture of the tricycle at all.

Di Renjie pulled Li Su to climb onto the tricycle, and then Di Renjie introduced to Li Su:

"Master, you see, on this tricycle, twenty-two crossbow arrow launchers can be installed. Ten can be installed on each side, and two more can be installed directly behind. In this way, you can shoot at any time when you encounter an enemy. ”

"In addition, these bolts can be fired in bursts and can also be angled, so that you can successfully form a team of steam tricycles. It is possible to shoot in batches. General Xue likes these steam tricycles very much, and is ready to go into mass production after consulting you, you see......"

This steam tricycle is definitely a great weapon if it is used in warfare.

Of course, the disadvantages of the steam tricycle are quite obvious.

The first is that the defense is still a little worse, of course, compared to horses, even heavy cavalry, and steam tricycles are not comparable.

The most important point is that the steam tricycle is too dependent on the terrain.

The terrain is too bumpy and the road is too bumpy, and it can't walk.

Horses are different, as long as they are not too dangerous, they can be unimpeded.

And, as soon as the internal combustion engine appeared, the steam engine would be eliminated.

This made Li Su, in fact, not very willing to mass-produce these steam tricycles.

However, it took great effort to develop the steam tricycle in scientific research.

If you deny it completely, it will chill their hearts.

Moreover, this steam tricycle is not useless.

After thinking about it, Li Su still agreed.

In the end, Li Su also made a suggestion.

"This king has found that your steam tricycle, the tires here are a weakness. If the enemy destroys the tires, the steam tricycle will quickly roll over. Therefore, I recommend adding a steel plate protection on the outside of the tire! ”

Hearing Li Su's guidance, Di Renjie nodded again and again, and immediately recorded it, preparing to improve it after he went back.

Li Su, on the other hand, shook his head and left directly.

Now Tuyuhun must rely on the Tang Dynasty to be able to establish a country.

Tubo was also frightened by the Tang Dynasty.

Not to mention them, even the fifteen countries that came to propose to Datang at the beginning, after seeing the power of the eighteen horsemen in Yizhou, I believe they will not use their swords and guns against Datang.

Therefore, this steam tricycle is sharp though.

But now that Datang is temporary, there is no enemy at all!

So, what's the use of building so many steam tricycles?

I learned the art of slaying dragons, but there are no dragons in the world......

……

At this time, compared with the calm Datang, the west of Datang is experiencing the baptism of war.

During the Tang Dynasty, there was also a powerful empire in the west of the Tang Dynasty called the Arab Empire.

At its peak, the Arab Empire spanned Asia, Africa and Europe.

And the Tang Dynasty called the Arab Empire the Great Food.

In the original historical trajectory, about a few decades later, the Tang Dynasty and the Arab Empire had another confrontation.

However, that confrontation ended in the defeat of Datang.

Of course, the reason why Datang failed was because the number of Datang's troops was small and the reinforcements did not arrive in time.

Da Shi also found that Datang was not easy to mess with, and soon the two sides signed an agreement, which did not lead to a follow-up war.

However, in the original historical trajectory, during this period, Dashi was busy expanding in all directions, and there was no conflict with Datang.

It's just that now because of Li Su's arrival, this little butterfly gently instigated its wings, causing many things to deviate from the established trajectory.

In this life, Dashi has developed somewhat rapidly.

In this life, the Great Eclipse is rapidly annexing Persia.

And the big eaters are genocidal killings, as well as cultural genocidal religious propagation. led to the end and mutation of ancient Egyptian and ancient Persian civilizations.

At this time, Persia, compared with the behemoth Great Eclipse, is simply the opponent of the Great Eclipse in the heavens and on the earth?

Because Persia saw that extinction was imminent, he hurriedly asked the Tang Dynasty for help.

However, from Persia to Datang, the road is far away, the letter of Guoxin asking for help was sent to Datang, and then Datang reacted and prepared to send troops, it is estimated that it will take at least nearly half a year before and after.

For such a long time, Persia must have perished long ago.

And the Anxi Metropolitan Protectorate, because he had received instructions from the imperial court, did not dare to rashly clash with Dashi.

The Persian Empire, which was soon annexed by the Great Eclipse.

The guards of the Anxi Protectorate also dispatched troops to prevent the Great Food Society from attacking Datang.

It was the army of the Caliph of the Great Food Nation that conquered Persia.

Last year, Al-Alpha launched an offensive against Byzantium and the Sassanid Empire.

Khalid, known as the Sword of Allah. Ibn . Willid, leading the Arabs, quickly passed through the inaccessible Syrian desert, on the banks of the Yarmok River, annihilated the Byzantine army of 50,000 in one fell swoop, and occupied the richest man in Syria is reform.

The successive victories of the Arab armies finally forced Jerusalem, which had been besieged for two years, to surrender.

In the face of the fierce exploits of the Arabs, the Byzantine Emperor Heraclius said sadly: Syria, such beautiful splendid rivers and mountains, still belong to the enemy!

The victory of a series of wars of aggression led to the rapid expansion of the Arab Empire at this time.

They are no longer satisfied with what they have achieved so far.

Compared with the original historical trajectory, their greedy eyes were fixed on the Tang Dynasty adjacent to them decades earlier.

In their eyes, Datang is a huge piece of fat.

If they can swallow this piece of fat, then their Arab empire will complete a qualitative leap.

Take Datang, the whole world, they have already won two-thirds, and the remaining one-third, will it be far away? (Just their own thoughts)

Therefore, the caliph has decided to invade the Tang Dynasty.

After they took Persia, they pretended to rectify Persia and did not make the slightest move to invade the Tang Dynasty, so as to paralyze the Tang Dynasty.

And Qiao Shiwang, the guard of the Tang Dynasty in the Anxi Metropolitan Protectorate, was indeed confused by the big food at this time. (In the official history, the establishment of the Anxi Imperial Protectorate was probably a few years later.) ）

He thought that the Great Eclipse was only for the annexation of Persia, and he had no idea about the Tang Dynasty.

At this time, the entire Datang did not have much defense against the big food.

The caliph, on the other hand, was rapidly rectifying Persia, while quietly preparing to launch an attack on the Tang Anxi Protectorate.

One night half a month later, Harris led an army to invade the Tang Anxi Protectorate.

And the place they chose was Hengross.

History has a huge inertia.

Although this battle, decades ahead.

But the location of the war was still placed in Hengross.

However, compared with the scene in the original historical trajectory, this time in the Battle of Hengros, Datang suffered a big loss.

Because Qiao Shiwang, the guard of the Anxi Metropolitan Protectorate, has less than 10,000 defenders in his hands.

Second, he doesn't have much vigilance against the army of big food.

This made the army of Great Food easily occupy Hengros.

And the easy invasion made the Great Food Army unscrupulous.

They feel that although Datang has a vast territory and a large population.

But compared to the other countries they invaded before, there was not much difference.

Datang's strength, in their opinion, is a completely unremitting blow.

In the following time, the caliph led his army to attack the cities of Kulan and Broken Leaf in the capital of Anxi.

and began to occupy the city of the Tang Dynasty vertically.

And Qiao Shiwang was first caught off guard by the Great Food Army.

However, he quickly reacted, organized the soldiers of the Metropolitan Protectorate, and began to counterattack.

Master Qiao looked at the captain of the horse, and he still had the ability.

At this time, the invading caliphate's army, because it was too smooth, also led to their underestimation.

And Qiao Shiwang took advantage of the psychology of the caliphate's army to underestimate the enemy, organized less than 10,000 Tang soldiers, and won several battles.

However, the army led by the caliph was more than 100,000 men.

And Qiao Shiwang's army is less than 10,000 people.

The huge gap in numbers made Qiao Shiwang only able to win one or two lucky victories in local wars.

Next, the caliph led a large army and destroyed Qiao Shiwang's army with a crushing advantage.

In the end, Qiao Shiwang led the army and evacuated in a hurry.

The caliph led the Arab army and quickly captured the Anxi capital of the Tang Dynasty.

Qiao Shiwang reorganized the army while flying pigeons to report the battle situation to the imperial court.

There are unsafe factors such as message leakage, so it is not a conventional way to transmit information.

But now that the Anxi Protectorate has been lost, and the entire Tang Dynasty is in danger, Qiao Shiwang has to use this unconventional means to pass the news to the imperial court as soon as possible.