At night, in front of the newly completed Qingliang Hall in the early summer, Yuwen Wen stopped and looked at his carefully designed "magic weapon" of cooling down, and felt that he could not see enough.

More than ten huge devices on the side of the hall made a "rattle" sound of running water. At the entrances of one ventilation duct, the exhaust fans pumped outdoor air into the pipes through the square "evaporation box".

The top of the "evaporation box" is not breathable and there are curtains on all sides. The cold groundwater extracted by the water pump is constantly poured onto the curtains on the "evaporation box". When the water on the curtain evaporates, the temperature of the air passing through the curtains decreases.

The cooled air enters the relatively sealed room through the ventilation duct, bringing a coolness to the room.

There is also a fan pumping the air at the top of the Qingliang Hall, which raises the heat and pumps out the hot air gathered at the top, and makes the air in the room flow without making people feel stuffy.

This complex indoor cooling device is called "water-cooled evaporative air conditioner", referred to as "air conditioner". For individuals, although the cooling effect is not as cool as sitting directly beside the ice arcade, the cooling effect of the whole room is good, and it is very comfortable to be in it.

The "air conditioner" that Yuwen Wen "invented" was actually copied. The prototype is the evaporative air conditioner that has been very common in later generations. This air conditioner does not require refrigerant and cools the air simply by relying on the principle that water takes away heat when evaporates.

It is precisely because he does not need refrigerant that he can "invent" it in this era and become a must-have tool for "pretending to behave".

Yuwen Wen entered the Qingliang Hall and entered the room through the double "insulated door". He felt a coolness coming towards him. He looked at the thermometer hanging at the door. At this time, the room temperature was twenty-seven degrees.

The outdoor temperature is 30 degrees, and the temperature difference between the inside and the outside is only three degrees. However, in this era without real air conditioning, Yu Wen is really satisfied with the temperature difference being able to be achieved.

In the room, the two beauties were ready. When Yuchi Mingyue and Chen Hua, wearing "secretary suit", saw him enter, they quickly came forward and untied their clothes for him.

Change into "home casual clothes": short shirt (T-shirt), "cropped pants", and then put on slippers.

This is Yuwen Wen’s home life clothing. According to the view of this era, his clothes are in strange costumes, referred to as “Fashion Monster” for short.

Yuwen Wen felt comfortable when he was at home. Of course, in order to avoid "the upper beam is not straight, the lower beam is crooked", his clothes in front of his children are still very normal.

But he had his own persistence and had to live according to his own ideas, otherwise the emperor would have done too much.

As the emperor, Yuwen Wen certainly had a better way to cool down, that is, choose a mountain to build a palace (traveling palace). Just like the later "Chengde Summer Resort" in the summer, the summer vacation effect will definitely be good and it is "environmentally friendly".

But the emperor's travel is all over. Not only concubines, princes, and princes are accompanying them, but all civil and military officials also have to go to the palace. In this way, guards and followers are indispensable. A large team of tens of thousands of people is no different from a city.

For so many people's daily life, the materials needed are transported from the capital, and the transportation cost will not be low. The palaces and roads are maintained every year, which is a considerable expense.

Yuwen Wen felt that it was just to escape the summer heat, which was too exhausting for the people and money. The solution was to install "air conditioners" in the palace, which would save money.

And a stature.

After changing clothes, Yuwen Wen started to do a serious business, came to the huge tactical chessboard, and started working overtime with the help of two secretaries.

There were hills, rivers, and wildernesses of the red and blue armies distributed on the tactical chessboard. Yuwen Wen held a battle report and "reviewed" the battle of Sashui not long ago, and felt the fierce battle at that time from another perspective.

He looked at the tactical chessboard, and Yuchi Mingyue and Chen Yan assisted from the side. They operated war games between the enemy and us based on the "war spectrum", so that Yuwen Wen could concentrate on the changes in the battlefield.

Before, Yuwen Wen, who was in Chang'an, received only good news, but nearly a month later, today he got the detailed "war score". With the "war score", there is also the latest situation of the Eastern Expedition Army.

There were constant storms on the sea and continuous rain on land. The army located on the banks of the Sashui River was like a lonely army. It has now retreated to the Yalu River line to shorten the food route and make a gesture to confuse the monarch and ministers of Goguryeo.

Let the other party think that this year, Zhou Jun is really leaving in spring and autumn.

Yuwen Wen doesn’t need to worry about how to operate the front line. He is now concerned about how the official army won the Battle of Sashui.

In this battle, the two armies faced each other and formed a dignified formation. The army formation lasted for more than ten miles, and the infantry and cavalry were combined. If the "traditional" fighting style was followed, it was infantry confrontation, cavalry waited for an opportunity to intersperse, break through the flank, and then used a left hook or right hook to determine the outcome.

However, due to the use of artillery, the official army in this battle was responsible for the heavy responsibility of flanking breakthroughs, and the light guns with light weight and easy maneuverability completed this task well.

Yuwen Wen "looked" the southern wing of the Goguryeo Army was defeated by light artillery, and "looked" the army that stretched for more than ten miles collapsed. He was very satisfied with the performance of the light artillery battlefield and the performance of the marshal Wang Jun.

Although King Yuwen Weihan of Yan was the commander, his actual command was in the hands of Wang Xu. Wang Xu claimed that he was familiar with military books and had strategies in mind, but even if he was a master of military tactics, he might not be able to use artillery correctly.

Cannons are weapons that cross the ages and have not been recorded in any military records, so how to use cannons is a problem that "traditional military strategists" need to solve. Yuwen Wen thinks that Wang Hu is no exception.

Now, the results of the Battle of Sashui show that Wang Na's use of artillery at least achieved the effect of "useful use of everything", because the original intention of the light artillery was to detour on the battlefield, breaking the enemy's formation from the flanks rather than from the front.

This tactic is suitable for infringement battles. It is difficult to have the opportunity to verify the effect of "light artillery side strike" when fighting against the Turks. Therefore, the Battle of Sashui is a good example, and the Liaodong battlefield is suitable for artillery power.

In the country of Goguryeo, Yuwen Wen felt that its domestic system was very similar to the "classical ****". It relied on mountain cities of all sizes to maintain its rule while expanding to the outside world.

Once a strong enemy attacks, rely on the strong city to defend and counterattack.

If we follow the original historical trajectory, in the era without a counterweight catapult, whether it is the Sui army or the Tang army, it will take a lot of troops and time to nibble the solid Goguryeo mountain city, so half a year is simply not enough.

The high transportation costs and unfavorable climatic conditions made the Central Plains dynasty's army attacking in the spring have to withdraw its troops by the end of autumn.

The retreat before the enemy tests the commander's ability and the cooperation of various troops. At this time, the Goguryeo Army, who will be pursued, will launch an annihilation battle. It is precisely because of this that the strategy of trying to achieve his merits in one battle to recover Liaodong will end up in a defeat.

Yuwen Wen has always taken it as a warning.

But now, the Zhou army not only has counterweight catapults, but also has more advanced artillery. Goguryeo's fortress tactics failed, and defensive counterattacks could not even be defensive, let alone counterattacks.

Even so, Yuwen Wen did not take it lightly. He did not intend to destroy Goguryeo this year, but Liaodong must be taken back.

Otherwise, I would be sorry for the large lineup of 300,000 people to fight eastward.

After the battle review, Yuwen Wen sat aside and thought about the problem. Yuchi Mingyue and Chen Jae began to pack up the chessboard. The two were wearing "secretary suits", and the curves were all revealed, which was very tempting, but Yuwen Wen's focus was not on this.

According to the combat plan, before the late Xia Dynasty, the first and second batches of the Eastern Expedition Army were at both ends of the Yalu River, and the main attack direction was to "cut the Goguryeo territory in half". After the third batch of 100,000 people were put into combat, the main battlefield was in Liaodong.

The goal is to annihilate the main force of the Liaodong garrison in Goguryeo. According to previous estimates, the opponent can piece together at least 150,000 troops in Liaodong, including various cavalry units of the Marine.

Goguryeo was founded for hundreds of years and has strong vitality. At the beginning of its founding, it had a close relationship with the Fuyu State in northern Liaoning. Now it lives in the various tribes of the former Fuyu region. For Goguryeo, it is a good ally.

Even in recent years, Zhou Guoxing has been exhausted and even deliberately released the smallpox virus, causing serious casualties between the military and civilians of Goguryeo, Liaodong. The various troops of the Marine who helped the war also suffered huge losses, but the other party was still able to struggle to death, so they should not be taken lightly.

Yuwen Wen is in Chang'an and can't worry about the front-line war. Now his son Yuwen Weihan leads his army to wait for the opportunity by the Yalu Water to deal with the "local legion" of Goguryeo. Yang Ji, the marching supervisor in Liaodong, is responsible for dealing with the "Liaodong legion" of Goguryeo.

This is the first time that Yang Ji has taken on the important task of "strategic". Whether the official army can achieve a key victory in Liaodong depends on Yang Ji's command ability. Yuwen Wen is quite looking forward to this.

Yang Ji was in charge of Yingzhou, and he used troops to the French tribes on the border for many years, integrating some of the Khitan and Xi tribes in western Liaoning. Then, he used the Eight Banners Army of the Marines as the backbone to form a French cavalry team.

This year is the first time this army has been put into large-scale operations. The effect determines the subsequent development direction of this army.

It can be said that this is a "model army", which is different from the "city" in history. If the effect is good, the court will use this as a template to promote it in the future.

Let those nomadic and fishing tribes who are willing to get close to the Central Plains dynasty become pawns of the Great Zhou official army.

There are countless border tribes, but border problems need to be solved, so the solution Yuwen Wen came up with is to "upgrade" on the basis of "city" and try to establish an oriental version of the Cossacks.

Whether this attempt can be successful requires time to verify, but the most critical first step must be taken well, so it depends on how "project leader" Yang Ji performs.
Chapter completed!