Li Lizhi said: "The lyrics and songs were all written by the fifth brother, and he also taught his daughter to sing them. ”

Li Shimin praised: "This kid is really capable, and he is proficient in everything." ”

Then, Li Shimin's father and daughter talked about family life.

When Li Shimin asked Empress Changsun about her physical condition, Li Lizhi only said that she was usually a little tired and it was okay for her to be tired. also specially asked Li Li to say that Li You returned to Chang'an, and it was Empress Changsun who asked him to go back to help him check his body, which gave Li You a reasonable explanation for returning to Chang'an.

Next, the condolence group organized many teams to perform condolence performances for the soldiers, which won the praise of the soldiers.

The song "Fifteenth Moon" quickly swept the officers and soldiers of the Tang Army of the Eastern Expeditionary Army, and then, with the singing of the personnel who transported materials back and forth, it soon became popular in the north and south of the Tang Dynasty.

On this day, Zhang Guigui took a team of Flying Tiger Army and transported a large number of supplies to the city of Anshi. Last time, Zhang Guigui followed Li You to Baekje, but it was not his turn to make meritorious contributions, and this time Li You sent him to assist Li Shimin in attacking Anshi City, and he was specially asked to make meritorious contributions.

The Tang army had not launched an offensive for a long time, but the Goguryeo people knew that sooner or later the Tang army would continue to attack the city, so they did not dare to relax their vigilance at all.

That night, a northwesterly wind of about three to four degrees blew in the sky, and the defenders of Anshi Castle endured the cold wind and watched vigilantly for movement outside the city.

The black pressure outside the city is unfathomable, and the city is quiet, only the sound of "fluttering" from the wind blowing the flag.

At 2 o'clock in the morning, the sentinels suddenly noticed that countless tiny fires were lit up in the northwest direction outside the city. At first, they thought it was a torch, which indicated that the Don army might be about to attack.

The Goguryeo people shouted warnings, and the officers and soldiers poured into the city, bending their bows and arrows, preparing to counterattack the Tang army's attack.

However, a strange thing happened, those sporadic fires did not rush to the city wall, but flew towards the sky, and those small bright spots like a starry sky flew in the direction of the city.

The Goguryeo people did not understand what was happening, they shouted loudly in terror and looked up at the strange scene in the sky.

After a while, the small bright spots grew larger, and then flew above the city.

The Goguryeo people vaguely saw that these things seemed to be huge lanterns, and there seemed to be ropes tied to the bottom of the lanterns, and the Goguryeo people really couldn't guess what these things were for.

Under the watchful eye of the Goguryeo people, the lanterns continued to fly towards the city.

Suddenly, the lanterns shook violently, and then burned into a huge fireball. The fireball continued to flutter for a few moments before it began to fall towards the city. Countless fireballs drifted to various parts of the city under the action of the wind.

The fireballs that fall are so powerful that they stick to them and continue to burn when they touch something. Many soldiers were stuck to their bodies by the fires that fell from the sky, and for a moment they could not extinguish the fires, and they were so burned that they cried wolf.

The fire ignited the wooden houses below, and it didn't take long for the fire to form a huge fire field, and the raging fire lit up the entire sky.

Li Shimin and others stood on the hillside outside the city, and they could clearly see the fire in the city. The fire was so big that it had spread all over the city, and the scene was spectacular. Even the battle-hardened generals like Li Shimin, Li Jing and others were all frightened.

Li Shimin looked at the Goguryeo people who were struggling in the flames, and his heart was slightly unbearable. He said: "In the future, we should use such cruel weapons as little as possible." ”

What kind of weapons did the Tang army use?

That day, Li You saw the eunuchs carrying lanterns passing by in the Liangyi Palace, and suddenly remembered the Kong Ming lantern.

Subsequently, he asked the craftsmen of the Ministry of Industry to make large Kong Ming lanterns. A clay pot filled with fierce fire oil was installed in the Kong Ming lantern. In order to facilitate adhesion during combustion, a lot of viscous crude oil is also added to it to form an effect similar to napalm.

When the lanterns were released, a long rope was attached to each lantern, and when the lantern rose into the air and flew over the city with the help of the wind, several soldiers held the long rope and shook violently. An iron hammer was hung from the top of the Kong Ming lantern, and the shaking of the hammer was used to break the clay pot.

After the clay pot shattered, the fierce fire oil began to burn when it encountered the flames below, which burned the Kong Ming lantern and caused it to fall. The soldiers let go of the rope and let it drift down with the wind.

The fireball fell to the ground and ignited the object below, causing this massive fire.

The continuous fire formed a huge fire field in the entire city, and the temperature in the middle of the fire was as high as hundreds of degrees, and countless Goguryeo people were killed in the fire.

The Goguryeo people also want to put out the fire, but how to save such a large-scale fire?

Soon, the gates of the city were opened, and many Goguryeo people fled the city to escape the fire. The Tang army received the surrender of these people and did not take the opportunity to attack the city. They don't have to, and they can't enter this city of fire.

The fire burned for two days and one night, and Anshi Castle basically became a dead city.

After the fire was extinguished, after the Tang army persuaded them to surrender, the remnants of the Goguryeo people Kaesong surrendered.

According to later statistics, more than 50,000 Goguryeo people were killed and injured in this man-made fire.

After Anshi City was captured, Li Shimin released a group of Goguryeo people who remained in Anshi City and asked them to spread the Tang Army's terrifying combat power of manipulating Tianhuo.

Next, wherever the Tang army went, the Goguryeo people basically surrendered in Kaesong.

The Tang army was invincible, and before the first day, the Tang army had crossed the Yalu River.

Chang'an City.

These days, Li You's main energy is focused on developing fire-fighting equipment. The drawings drawn by Li You are very accurate, the structure of the high-pressure water pump is not complicated, but each part is required to be very precise, there is a lack of cutting and grinding tools in ancient times, and each part has to rely on craftsmen to make it by hand, which is very difficult.

However, the craftsmen of the Tang Dynasty were still very skilled, and according to modern judging standards, many craftsmen in the Ministry of Industry had reached the level of eighth-level workers.

The craftsmen finally finished building a high-pressure water pump, but when they tested it, they found that the distance of the water spray was less than 15 feet, because the quality of the sealing ring was not up to standard.

At this time, there was no rubber, and the craftsmen had to replace it with buffalo leather, which was prone to deterioration and decay in a humid environment, and the toughness was not enough.

Li You gave the craftsmen the idea to use a steel seal with cotton thread wrapped around it. After testing, the results are not bad.

On this day, the first fire engine was developed. It is a four-wheeled carriage pulled by two horses, with a water tank with a capacity of 1,500 liters, equipped with six firefighters, equipped with high-pressure water pumps, spray guns, folding fire ladders and other firefighting equipment.

Wei Chigong was very interested, and together with Huang Furui, he went to the test in person.

Qi Wangfu.

Wei Chigong and Huang Furui came to the Qi Palace, and reported to Li You the test results of the fire truck, which basically reached the designed firefighting capacity.

Just when they were discussing how to organize the mass production of fire-fighting equipment, establish a regularized professional firefighting team, and promote it to the whole country in the future, Li Chengqian sent people here, and another difficult problem was placed in front of Li You.