There are eight rooms on the third floor. Each room is filled with four people. Zhou Yun lives in a single room.

The butler took Zhou Yun to the roof.

The roof of this building is more than 500 square meters, and the top floor is very thick. There is a one-meter-5-meter-high wall around the roof, which surrounds the roof. Standing in the middle of the roof, you can't see the surrounding houses, you can only see the clouds in the sky.

Only by approaching the wall can you see the houses, roads, rivers, and fields below.

The housekeeper pointed to the distance and said, "You are artillerymen, so we have designed an action specifically for you. If this action is successful, then you will become famous in one fell swoop and become famous all over the world. We will promote you to major general division commander of the Peace Army."

Zhou Yun stood at attention: "I am willing to serve the Imperial Army!"

The butler waved his hand and someone lifted the thing up and placed two boxes on the roof.

When the person who was carrying the things left, the housekeeper asked Zhou Yun to unpack the box.

Zhou Yun moved this box, which was the wooden box that was carried into the swamp when he was working as a porter in the swamp.

After the box is opened, there is a mortar.

Zhou Yun knew what the butler meant was to ask him to assemble a mortar.

If it cannot be assembled, it is no longer an artillery.

Fortunately, Zhou Yun had a small score, so Zhou Yun quickly assembled the mortar.

Mortars are generally composed of four parts: gun body, gun mount, seat sheet and sight. The gun body can be made differently according to the distance of the range. The length of the gun body is generally between 1 and 1.5m; the gun mount is mostly bipods, which can be adjusted according to the target position and can be folded when carrying it; the seat sheet is the main component to withstand recoil force, and together with the bipods, they play the role of supporting the mortar body; the sights are mostly sights, engraved with directional division and height division.

The operation and use of mortars is also very simple. After discovering and aiming at the target, slide the mortar shell from the muzzle into the barrel, and relying on its own mass, the bottom fire of the shell hits the striker at the bottom of the gun barrel; or slide to the bottom of the gun body by relying on its own mass. After the shooter operates to release the striker, it hits the bottom fire of the shell. After the bottom fire is fired, the basic medicine tube at the tail of the shell is ignited, and the gunpowder tied into the additional medicine bag outside the shell is also ignited. Although there is a certain gap between the shell and the barrel to ensure that the shell slides down, the air-locking ring outside the shell can still form a great pressure in the chamber, pushing the shell out of the muzzle and fly to the target.

Seeing that Zhou Yun was very professional and skilled, the housekeeper no longer doubted. He pointed to a building in the north: "Aim at that building."

Zhou Yun held the launch cylinder with his left hand and turned the handle according to the target distance until the adjustment rod reaches the corresponding length.

After the mortar shooter makes a rough aim through the line of sight, he pulls the belt on the firing machine to shoot the grenade out of the grenade. Without an accurate sight like a cannon, it can only make rough aim.

After Zhou Yun settled down, the housekeeper looked at it: "Not bad! Your skill will not reach this level in less than three or five years."

In fact, the butler said it was right. Zhou Yun, a special forces soldier in later generations, played with mortars for several years.

Before leaving, the butler told Zhou Yun to take his men to the rooftop to practice in the past two days. He was familiar with his skills and was about to use them.

"Can I give them a direction so that I can also let them master the coordinates?" Zhou Yun said.

The butler did not hesitate and pointed in one direction. The northeast is five hundred meters.

In the evening, Zhou Yun lay on the bed, rummaging and rumbling and unable to sleep. He was considering a question, what is his goal?

The five hundred meters northeast of the housekeeper, Zhou Yun did not believe that it was the target.

That place is thoughtful and familiar, it is a civilian area. What's the point worth blowing up? It's definitely not that place!

Zhou Yun called out the accurate Nanjing map in his mind.

"Xiaofen, if launched from this building, how many targets are there around?"

Xiaofen replied: "There is no target! You know, they have put in such a lot of effort and will not blow up these residential areas."

Zhou Yun thought of another box, which was a casing, that is, putting a 1.5-meter-5 pipe on the mortar to extend the shooting distance of the mortar.

"What if the casing is added?"

Xiao Min quickly replied: "If you add a casing, the shooting distance can reach 1,300 meters. In that case, there are five targets to shoot."

“Which five?”

"A warehouse for logistics installation. One is a military police barracks, where there is a military police company. One is the regiment headquarters of the military police. One is a battalion of the guard division. And the other is an official residence..."

Before Xiaofen could finish speaking, Zhou Yun jumped out of the bed!

The warehouse, military police barracks, a military police company, a military police regiment headquarters, and a battalion of the guard division. These four places are definitely not worth the Japanese's efforts to blow up this land. It will not be of any use.

Then, the most likely one is the official residence.

The old man's official residence is located in No. 3 Huangpu Road. Also known as "Qilu", the address is in the compound of the Ministry of National Defense of the National Government of Huangpu Road. It was also the location of the Central Military Academy. It officially started on July 12, 1929 and was completed on October 14 of the same year. The old man and his wife moved in soon.

In later generations, Zhou Yun once visited this place.

This two-story building is a typical building in the style of Chinese and Western style during the Republic of China. Among them, the main building has a construction area of ​​270 square meters, with an ochre-red appearance, facing north and south.

On the east side of the first floor is the old man's reception room. On the wall of the living room, a large photo of Sun Yat-sen and the old man was hung: Sun Yat-sen sat upright in Zhongshan outfit, the old man was wearing a military uniform and wearing a long sword, standing behind Sun Yat-sen. Above the photo, Sun Yat-sen's handwritten horizontal note: "You must believe in safety and danger in the future, and you must taste the joys and sorrows when you come."

In the middle is a large dining room. On the west side is a small reception room. The layout inside is bright and elegant. A row of long floor-to-ceiling windows are lightly closed. On the wall are watercolor landscapes of Italian painters, which are very feminine. This is the reception room of the lady. The lady often meets her girlfriend and ambassador's wife here to carry out "Madam Diplomacy".

On the west side of the official residence is the study room, and on the east side is a large bedroom. There is also a living room outside the bedroom, which is specially designed to meet with the relatives. On the east side of the bedroom is a large platform. Old men who are used to getting up early often read newspapers on this platform in the early morning.

The next day, Zhou Yun asked someone to move out several mortars to make everyone familiar with them and practice.

Zhou Yun also occupied a cannon. He wanted to confirm what he was thinking at night.

Zhou Yun used this cannon to add a special cannon chamber. Then he visually found that the official residence was under the cover of the mortar.

By the way! The Japanese even tampered with the shells. If that were the case, as long as they aimed at the official residence, no one would escape the official residence.

Panic arose in Zhou Yun's heart. Fortunately, it was a trial. If the butler asked to shoot yesterday, it would be over.

Who knows when the Japanese will order the launch?
Chapter completed!