Liu Yun looked at the map silently, as if digesting the suggestion of the commission.

With the assistance of Zhi Brain, Lao Jiang's strategic ideas were quickly simulated one by one.

Shanghai, Nanjing, and Hangzhou are about 200 kilometers apart from each other, and once an air defense radar station is set up in Sheshan Mountain, Nanjing, and Tianmu Mountain in Hangzhou, it will just cover this large triangle and can effectively protect the entire Songhu battlefield and the security of Nanjing's airspace.

The deployment of the site on Tiantai Mountain is even more a stroke of genius, so that the enemy planes coming from the Taiwan direction have nothing to hide.

Because there was no satellite navigation in those days, and the planes flew by sight, the Devil's Air Force could only fly close to the railway line or the coastline, and the radar detection area of Tiantai Mountain was just enough to cover all the flight paths of enemy planes, and whether it was attacking Shanghai, Hangzhou, or Nanjing, it had to pass through this radar area.

Ginger is still old and spicy.

Once the radar network is completed, its strategic value is immeasurable, and if the Japanese bomber group takes off from Taiwan's Songshan airfield, Nanjing can get an early warning of 600 kilometers, and if it takes off from an aircraft carrier at sea, it can get an early warning of more than 400 kilometers.

Moreover, the aircraft in the 30s were still the era of propellers, and the economic speed of flying was relatively low, generally about 200 kilometers.

Therefore, if an enemy plane wants to sneak attack Nanjing and other places, the air command center in Nanjing can get a two-hour warning time, and even if it wants to sneak attack Hangzhou and other places, it can also get a one-hour early warning.

Our air force can use its forces to the greatest extent.

Of course, Commander Liu welcomed these enemy planes to attack the Songhu battlefield at the highest speed.

In that case, often before reaching the sky above Songhu, all fuel will be exhausted, and finally planted from a high altitude, either buried in the sea, or hit the mountain and died, but save a lot of hands and feet.

However, Commander Liu still underestimated Lao Jiang.

In the Republic of China in the 30s, there was no air defense radar, but there was a naked eye radar available.

Experienced intelligence personnel can observe the types and trends of enemy planes with the naked eye alone, and then report them to the relevant departments through secret radio stations.

Radar to the naked eye, only in terms of timeliness and accuracy, is slightly worse.

In other words, it is also possible to set up secret observation stations in places where enemy planes often hang out, which means to set up a secret observation post in a specific area or on a high mountain, and transmit the number and movements of enemy planes observed to the air command center in Nanjing through a secret radio station.

Even in 1945, when World War II was coming to an end, relatively backward countries such as Japan, China, and the Soviet Union were still using this primitive and effective air defense early warning method.

Western Sichuan has already developed an air defense radar, and Lao Jiang naturally has no reason not to adopt it.

He immediately appointed Major General Liu Yicheng as the head of the Nanjing radar technical group, which was temporarily under the direct jurisdiction of the Nanjing Military Commission, and was specially responsible for the installation and commissioning of the radar system.

As for the installation of the radar, of course, it will be installed by the technicians of western Sichuan.

The first person in charge is Lieutenant Colonel Yu Zitian, who was one of the people who followed Liu Yun to western Sichuan in the early years.

Lieutenant Colonel Yu was born in a martial arts family, in November 1934, temporarily sent by the Wuhan military to western Sichuan, responsible for protecting the personal safety of technical personnel, these years have been studying at West Sichuan University, won the trust of Commander Liu, with the continuous improvement of radar technology, she also became an expert in radar.

Fortunately, Lao Jiang has also heard a little about Yu Zitian.

Over the years, with the growing power of western Sichuan, there are many agents who want to break into the western Sichuan system, but the cases of successful lurking are basically unheard of, but it seems that the western Sichuan system is more unfathomable.

What's even more ridiculous is that even the natives of western Sichuan County are gradually migrating outward.

Not to mention the foreign population, it is the limit to be able to reach Maozhou City, and Sichuan West County has become an intelligence black hole.

Only the first people to go to western Sichuan were allowed to settle in the county towns of western Sichuan, and these people were the real power of the western Sichuan system, and they controlled all the key departments in western Sichuan.

It also led to them becoming one of the focuses of attention of major intelligence organizations, and the military commanders and central commanders under Lao Jiang were even more powerful, and even took the initiative to help the western Sichuan system in secret, erasing the past history of these people in an organized and planned way, so that other intelligence organizations could only grope in the dark.

At around two o'clock in the morning, Lao Jiang fell asleep unconsciously.

Commander Liu, who was still unsatisfied, had no choice but to give up, he originally wanted to talk about the defense of Shijiazhuang.

After draping President Jiang with a blanket, Commander Liu took advantage of the vast rainy night and took the special service speedboat of the Nanjing small battalion to go straight to Wuhu Airport, and immediately prepared to start installing the radar.

When Liu Yun was in the airport and arranged everything, the sky was already white.

Yu Zitian and other radar technical experts did not need to be told by him anymore, but along with the special service military police, they loaded four air defense radars onto the ships and transported them to the Purple Mountain in Nanjing one by one, striving to successfully modulate them as soon as possible.

When Commander Liu was about to take a nap, there was a cheer in Wuhu Airport.

It is said that the air force units of China had sunk the Japanese ship "Izumo" and carried out fierce bombardment of the warehouses and positions of the Japanese troops stationed in Shanghai, as well as the headquarters of the Marine Corps, and other key places, and won countless victories at one time.

Looking at the continuous heavy rain, Liu Yun was also stunned.

Then he suddenly remembered that the Izumo was a cruiser, once the seat ship of the Japanese emperor, and now the flagship of the Japanese Third Fleet.

Since the "77 Incident," the ship has been cruising around Songhu with more than 10 warships, and the deterrence on the Songhu battlefield is really not small, and the Air Force can sink this ship, which is indeed worth celebrating.

The Japanese ship "Izumo", an armored cruiser with a displacement of nearly 10,000 tons, was built and manufactured by a British shipyard, participated in World War I and the Russo-Japanese War, with a length of 121.92 meters, a width of 20.93 meters, a draft of 7.37 meters, a power of 14,500 horsepower, a speed of 21 knots, and a rated establishment of 672 people.

The ship is armed with 4 203-mm naval guns, 14 150-mm cannons, as well as more than 20 rapid-fire guns and anti-aircraft guns, as well as 4 450-mm torpedo launchers.

Although the "Izumo" has long been obsolete with the passage of time, it is still a behemoth for Huaxia.

Taking the "Haiqi" as an example, it is already the largest warship in China at present, with a displacement of only 4,300 tons, and the "Izumo", which is nearly 10,000 tons, even exceeds three or four heavy artillery regiments in one-time firepower projection.

What's more, the "Izumo" was never "alone".

It was also a flagship, at its most glorious, it had commanded nearly 100 warships, and in 1932, when the "January 28 Incident", it led the Japanese fleet to blockade the southeast coast of China, and the entire Chinese navy was powerless.

Looking at the heavier and heavier rain, Liu Yun also galloped to lie down.

This guy just closed his eyes and slept in a daze for a while, and in the Wuhu airport, a terrible air defense siren suddenly sounded, and even if he was sleepy, he was suddenly frightened to wake up.

It was almost 12 noon.

The soldiers in the airport all opened their confused eyes and looked at the constantly raining sky, and they all made a "cut" sound, this ghost weather, even if the Japanese devils did not want to die, they would not dare to fly to bomb Nanjing or Wuhu.

Unfortunately, the opposite is true.

The commanders of the Wuhu base were very anxious to inform everyone of the enemy's situation, that the Japanese bomber group had flown over Hangzhou and was now flying in the direction of Nanjing, and that the Hangzhou Air Force wanted to intercept it, but was entangled by the devil's carrier-based planes, so it warned the Nanjing airfield.

"August 14 Jianqiao Air Battle".

Liu Yun woke up suddenly, and in another time and space, the "14 August Air Battle" in Hangzhou Bay also broke out, and the enemy planes were a group of bombers that had taken off from Songshan in Taiwan, and the total number was not much, and it was just over 10 planes, and the targets of the bombing were precisely the Jianqiao Air Force Airport and the Guangde Airport in Anhui.

But what made this guy even more unsettling was that there didn't seem to be any carrier-based aircraft escorting it at that time.

Commander Liu couldn't help but secretly complain, it seems that he himself traveled to the time and space of the Republic of China, and sure enough, it caused a mysterious butterfly benefit, and on August 14, 1937, the Japanese army began to bomb Nanjing.

However, the commander of the base also said that the Japanese bomber group this time was all twin-engine heavy bombers, and the total number was estimated to be more than 50.

Commander Liu was suddenly shocked, this is a strategic bombing, and what is even worse is that it is raining today, and the military and people in Nanjing are not prepared at all, and once a large-scale bombing is carried out, the consequences will be disastrous.

For other nonsense, Major General Liu didn't want to hear it anymore.

Seeing this guy's order, the pilots of the Flying Bear Fighter Squadron in West Sichuan all looked solemn and began to check their clothing, check the fuel and ammunition on the fighter one by one, and make final preparations for the take-off of the Flying Bear fighter.

Soon, panicked shouts of escape were faintly heard from the southeast.

About half an hour passed, and the Flying Bear group began to rise into the air one by one.

Seeing the squadron in western Sichuan struggling to take off in the wind and rain, the other pilots in the Wuhu airfield all blamed themselves, so they followed the example of western Sichuan one after another, and immediately supported the air battle over Nanjing after filling up the fuel and ammunition.

When the squadron arrived over Nanjing, it was still a little late.

The air defense sirens in the urban area of Nanjing were still sounding for a long time, and the Japanese First Combined Air Force had already flown over Nanjing.

Fortunately, these enemy planes were only the vanguard, with only a dozen bombers.

They were frantically dropping bombs in the urban area of Nanjing, blowing up the Yuhuatai area to shreds, and they didn't even care whether the targets of the bombing were military facilities or not, and most of these bombshells fell in the residential areas.

Bombshells roared down, nearly 100 houses were blown up into the sky, and countless innocent people wept and wailed in the smoke and flames.

The killers were getting more and more excited, and were about to lower their altitude and shoot at the survivors.

He remembered that on 7 August 1937, Nanjing's "Xinmin Bao" once babbled nonsense, asserting that Nanjing "is not a heavy industrial zone, not a financial market, not an important military town, and it is really not up to the bombing of enemy planes, and Nanjing is not as dangerous as generally imagined," and "I just hope that everyone will be calm and calm."

When the Kawanishi squadron saw enemy aircraft, the enemy also saw them.

These enemy planes had no intention of escaping, as if they had forgotten that they were bombers, only to see them meet them like fighters.

This surprised Commander Liu.

What's even funnier is that these Japanese planes are all twin-engine bombers, and none of the fighters escort them, and someone is happy, haha, this is all a big wrongdoer who gave away people's heads.

Liu Yun shouted arrogantly on the public channel of the group, "Everyone, pay attention, the Japanese devils have sent meritorious deeds, and they are fast and slow, and whoever is the first ace pilot depends on the present day."

Major General Liu took the lead, and as if he was stunned, he rushed straight towards the group of enemy planes.

"Nani, so ferocious, trying to fight bayonets in the air."

Even the self-confident Japanese military commander was dumbfounded, and for the Huaxia fighter in front of him, he forgot to pull the trigger for a while.

Perhaps they were afraid that after the volley explosion of the enemy plane, the debris storm formed would even sweep them away, because once the fighter plane was hit by fragments, the lethality of these fragments was no less than that of being directly hit by a machine gun.

The enemy is afraid of death, which does not mean that Major General Liu is not afraid of death.

On the contrary, someone is still afraid of dying tightly, but this guy has a wise brain and ant protection, and he can calculate many things in advance.

For example, just now, when the enemy plane entered his effective range, it immediately sent out a large series of shells, which hit the enemy's long plane into a volley and exploded, forming a large rain of meteors.

With the volley explosion of several fighters, both sides learned from Commander Liu and avoided the debris by climbing.

Because the fighter plane is very, very fragile when flying, and often even a sparrow can shoot it down, not to mention the dense explosion wreckage of the aircraft, the pilots on both sides have consciously escaped from the "air crash zone".

Fortunately, the Flying Bear fighter in western Sichuan, although it is a double-engine heavy fighter, is a genuine fighter, and it may be inferior in dexterity, but when it comes to the climbing speed, it is definitely not weak, on the contrary, the Japanese fighter is miserable.

A bomber is a bomber, how can it be compared to a fighter.