A maple leaf fell down and rested on the shoe.

Su Yan stopped, bent down, picked up the maple leaves to play with, and said with emotion: "It's autumn again in a blink of an eye."

Time passed quickly, slipping away from his busy daily work like a fish; but it seemed to pass very slowly, very slowly.

When he looked at the capital in the direction of the sunrise, when he was writing memorials and private letters, he suddenly saw a Middle Eastern-style long sword on a Hu merchant’s stall and lost his mind, time was like frozen donkey-hide gelatin, very tough.

At this time, he can only rely on letters to pass the long night in Shaanxi.

He gave the letters another name and put them in different boxes by category.

Most of the royal letters of the emperor start with the weather, then talk about state affairs and government affairs, what feats the heroes in the court have done, occasionally tease one or two stupid officials, and finally ask him what difficulties and needs he has.The whole letter looked innocent, and even the best historian could find no faults.

But Su Yan could see the affection between the lines, the more he deliberately downplayed it, the more intense it was like wine——

"In the hot season, it is easy to get thirsty when thinking about it, and it is difficult to relieve it by drinking more water."

"Is there a difference in the moon between the two places during the Mid-Autumn Festival?"

"All the courtiers are full of incense, and I haven't smelled the fragrance for a long time..."

He couldn't help rubbing the words with his fingertips, wanting to touch the cuff of the dragon robe through the page.

Shen Qi's letters are like letters from home, they talk less about official affairs and more about family affairs, with an infatuation that is better than newlyweds after a long absence.He took care of all the things that Su Yan hadn't had time to arrange in the capital, including expanding the house, connecting the original small house and the big house next door into a complete set, and renovating it.

Because of this, Ruan Hongjiao moved out and rented another small, secluded yard, but it turned out that the landlord was Gao Shuo. This coincidence made her suspicious, and it also made Su Yan laugh and smile.

Shen Qi sent him the wine she made by herself, and learned to write love poems in reply. Although none of the lines were in line, Su Yan liked it very much, and always read it silently a few times before going to bed.

Sometimes he feels in a trance that the other party's peaceful appearance seems to be covering up something, and even feels a momentary shock, but when he recovers, he feels that he is thinking too much—Qilang's hostility is gradually disappearing, which is a good thing, What's there to worry about?

The prince's letters came the most frequently and were the most disorganized. He seemed to say whatever he saw or thought of. Occasionally, he would come to him to find a solution when encountering a problem, but every time it was necessary, there were various tongue twisters: "Mr. Miss you, do you miss me?" "If you miss me when I miss you, does it mean that I have a heart-to-heart with you?" "It's too perfunctory! My last letter wrote 28 wanted words, but you only got five in your reply letter. Too much! Remember to make up for it next time you reply, or you will have to double the compensation.”

Su Yan was amused by these childish chatter, but he also noticed that Zhu Helin was rambling, and most of the time he was deliberately being stupid to make him happy, so he was a little moved.

In July, the prince's letter was suddenly cut off for more than half a month.Just when Su Yan was worried, a new letter suddenly came, and it looked the same as before. Xiao Zhu was still a passionate and high-spirited Xiao Zhu.So Su Yan was relieved, and told him to write fewer letters if he was busy with business.

The prince didn't listen to the persuasion, but the letters came more often.

The last box is... a letter from King Yu.The number of pieces is the least, but the length is the longest.Su Yan was wary at first, fearing that he would write shameless little yellow text again, he hesitated whether to throw it away, but then decided to take a look.He opened the letter like a bomb, but finally found that it was a very serious official letter, he was shocked and then heaved a sigh of relief.

King Yu mainly chatted with him:

In mid-March, the government issued a notice to officially recruit people with lofty ideals who are keen on studying "Gewu Xue";

According to Su Yan's preliminary division of Gemology, Physics, Chemistry, Medicine, Light Industry, and Mechanics, how many people were recruited for each;

Who brought research theories and self-created inventions into the hospital, and what kind of sparks did they collide with other fellow enthusiasts...

Su Yan felt itchy when he saw it, and couldn't help but reply to the long letter.Although the whole story is chatting about the engineering school, King Yu still cheered up like a chicken blood.

Su Yan mentioned rubber products and said that if there was a way, he would ask Jiaozhi to contribute some raw rubber, and King Yu readily agreed.

The king of Yu has always been vigorous and resolute in his affairs. Not only did he rush to get the tribute in advance, but he also greeted the students and craftsmen of the Tiangong Academy. According to Su Yan's prompts, he began to ponder the production of cooked rubber-removing natural rubber as much as possible through filtration, natural sedimentation and other methods. impurities, and then add sulfur to heat and pressurize.

The procedure is not complicated, but the ratio and temperature are difficult to grasp. They tried many times and gradually learned from their failures. In the end, they really produced a roll of mature rubber with a certain shape.Nailed to the outer ring of the wooden wheel of the car, there is a little prototype of the tire.

Su Yan was very happy, and made an insatiable suggestion. Solid rubber tires are too noisy, and the shock absorption effect is not good. Try making them hollow?

So in the yard of Light Engineering, one of the six schools of Tiangong Institute, the scientific enlighteners of this era started a new round of attempts and improvements.

Su Yan tried his best to use the superficial knowledge he got from the Internet in his previous life to prompt and dial. The specific operation all depended on the groping of these folk tycoons and craftsmen, and the process was naturally very tortuous.

As one of the founders of Tiangongyuan, King Yu burst out with an unprecedented sense of responsibility.As a result, the two letters were exchanged, and in the end they became a bit like like-minded pen pals.

Relying on these, Su Yan survived countless long nights of loneliness, concern, and longing after being exhausted from running around during the day.

Until September, Shen Qi sent a letter from Jin Yiwei's secret sentry pigeon, which made him vigilant.

Shen Qi said in the letter: The Tatars and Oirats will make a big move, and the Xuanfu on the nine sides to Ningxia may be caught in the flames of war.In the north of Shaanxi, there are two border towns, Yulin and Ningxia, adjacent to Hetao, which is the most frequently invaded place by Wala. Qinghe can't stay for long, come back soon!reply ASAP!

After reading the letter, Su Yan was still a little puzzled:

A few months ago, when he heard that Altan had returned to Oala safe and sound, he was overjoyed and relieved, thinking that the conflict between Oara and Daming had turned for the better.In the past few months, the small-scale battles caused by the Oirat cavalry invasion at the border have also decreased. Why did they suddenly deteriorate again?

Shen Qi did not specify the specific reason in the letter.Maybe it's because Beizhen Fusi's intelligence is more about the court and the country, and the overseas intelligence is less involved.

Su Yan knew that Shen Qi was either a person who listened to the wind or the rain, so he must have obtained some definite clues from the Ministry of War before coming to warn him.

He hesitated.Naturally, he wanted to go back to the capital, but no one had taken over the positions and affairs in Shaanxi. He hadn't received a transfer order, so he couldn't just leave.

Before he hesitated for a day or two, the imperial edict was sent to him by expedited flight six hundred miles away.

It was Emperor Jinglong's handwritten order, ordering him to return to Beijing immediately to return to his command. The imperial court has sent another special manager, Ma Zheng Yushi, to Shaanxi.

Sending another censor to hand over this was a plan that had been made before, and there was nothing to talk about, but both sides urged so urgently that Su Yan felt ominous and suspected that a war was about to happen.

It's not the kind of small fights where dozens or hundreds of Tartars plundered on horseback, nor is it mobilizing thousands of frontier troops to defend the pass, but a national war involving tens or even hundreds of thousands of soldiers and horses!

... Is there such a war in history?Su Yan tried hard to remember, but his mind was clouded and foggy, and he really couldn't remember.

In my impression, Tatar and Oala have never really joined forces.This pair of old enemies are like two wild beasts locked in a cage, biting each other while tearing at the door of the cage.

For hundreds of years, the border of Daming was constantly harassed by them, but there were still short honeymoon periods, sometimes with Tatars, sometimes with Oala.Most of the time it depends on which side is not powerful enough, so Da Ming will give it a hand, happy to sit on the mountain and watch the tigers fight.

But now, the two beasts have joined forces?If they work together to bite the cage door, how long can the cage door keep them closed?

Su Yan felt a headache from recalling too hard.

I should have realized that in my previous life, I was a scumbag who was a poor student, and he complained mercilessly about himself.Or maybe this is a parallel world, and the history I know is not only useless, but also misleading me, making me ignore the real crisis.

The left and right cannot resist the order, and staying in Shaanxi will have no effect on the battle situation. It is better to go back to Beijing to learn more about the current situation.

Su Yan quickly packed his bags and prepared to leave for Beijing.

It's just that no matter how fast the journey back to Beijing is, it will take more than half a month, and Shanxi will be passed through on the way.

Su Yan felt that Shanxi seemed to be more dangerous than Shaanxi, because Xuanfu and Datong, two heavyweight frontier towns, were too close to the capital.

—Would it be safer for King Yu to return to Datong to guard it?The thought flashed through his mind.

At the same time, a night-buying team from Xuanfu, under the leadership of Yexue, the general flag building, and Huo Dun, the team, has quietly sneaked into the northern desert. A small town called "Hasta" in the Mo language.

This is the place where Tatar and Oala agreed to meet.

The Tatar Grand Master Tuohuotai was leading troops across the vast sea outside the Great Wall, and fought a battle with Li Ziyang, the newly appointed general of Datong.So he handed over the sure-fire alliance ceremony to his son Wuhalang.

Although Wu Halang was despised by the northern desert tribes because of his despicable character and obsession with obscenity, he was born of the most beloved woman of Tuohuotai, and he favored him very much.So he entrusted this task to Wuhalang, which is equivalent to giving his son a great contribution, so that he can gain a foothold in the Tatar court.

As for the nominal King Khan of Tatar, he was still an eight or nine-year-old kid who hid in his mother's arms when he was afraid.Not only did the orphans and widows not be taken seriously by the fire platform, even Wu Halang was unceremonious, throwing the little Khan king on the horse's back, and took it with him as a justifiable background board.

On Oara's side, the Khan King Hukuoli, the Grand Prince Altan and the Grand Elder Heiduo went.

It can be seen that both sides attach great importance to this alliance, at least on the surface.The conditions were discussed back and forth for several months before, and this time the alliance has dispatched the kings of both sides, and it is obvious that it will be possible in all likelihood.

After Lou Yexue got the information from the scouts, she said with some regret: "Give me 3 horses, and I can tear Hastur into pieces and wipe out the brains of both sides."

Huo Dun immediately said: "It's not that easy! Both sides are accompanied by the most elite northern desert cavalry, and they are familiar with the terrain. Not to mention 3 horses, 10 horses are hanging!"

Lou Yexue glared at him: "You look down on me?"

Huo Dun was startled, and immediately shook his head: "No, no, I mean... there are only seventeen of us, including you, eighteen."

Lou Yexue pursed her thin lips into a sharp arc, and said in a sinister tone, "So what about the 18 people, Wu Halang will definitely die!"

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