"Abide by the order!"

Yun Qichang saluted Yang Fan, then quickly turned around and commanded the troops to disperse the formation and build an air defense position on the spot.

Yang Fan turned to look at Pang Bingxun and said, "Captain Pang! The Japanese bomber group will arrive in at most half an hour. Please evacuate the crowd quickly! The Japanese plane is not eye-catching in a while!"

"What, is the Japanese plane coming? OK! OK! Please inform me immediately. The Japanese bomber is coming!"

Pang Bingxun subconsciously looked up at the sky, but could see no signs. But naturally, he would rather believe in such a thing than not, and immediately issued an evacuation order!

"Commander Yang, thank you very much for leading your troops to rescue the siege. Please lead all your brothers into the city for a rest! It is also possible for me to enter the friendship of the landlords!"

Immediately afterwards, Pang Bingxun invited Yang Fan and others to go to the city to avoid the Japanese plane, and asked Yang Fan to sit down and have tea and chat. No matter what, it is said that there is still something to do with face.

"Then thank you, Chief Pang for your kind hospitality!"

Yang Fan was not polite, and followed Wu Maoning and others into the city. The main force was temporarily scattered and hidden outside the city and did not enter Philadelphia!

Woo~Woo~Woo~

At this moment, sharp air defense alarms sounded one after another in Rizhao County, Ju County, Yishui County and other places!

After suffering many losses, the Japanese Navy Aviation Corps did not dare to swagger through the airspace of Jiaoxian, Zhucheng, Gaomi County and Anqiu County. So this time, the detour entered from the southern part of Rizhao County and then went straight to Fei County!

However, it is obvious that these small actions have long been calculated by Yang Fan and others.

"Be careful with all gun positions! The Japanese plane will pass here in two minutes. I will be able to open up all the firepower in a while and I will be hit hard!"

More than 30 anti-aircraft guns arrived in the southern suburbs of Rizhao County in half an hour. Under the focus of air defense radar, the movement trajectory of the Japanese aircraft group was naturally clear!

Buzzing, sure enough, two minutes later, there were a series of motor buzzing sounds coming from the sky. When you look into the sky, you can clearly see a group of small black dots flying rapidly from east to west in the sky.

"Delayed fuse 12-16 seconds! Prepare! Fire!"

The anti-aircraft artillery troops, who had been preparing for a long time, emitted roars of shock, and caliber ammunition rushed straight into the sky. Even in broad daylight, they could see flashes of flames.

The 76mm caliber anti-aircraft gun has an initial velocity of 1,000 meters per second and a shooting height of 10 kilometers is enough to cope with all the mainstream aircraft in the world!

Bang bang bang bang bang, 20 shells exploded in the air one after another, turning into countless high-speed shrapnel shots, turning the surrounding hundreds of meters into a forbidden area for death!

Ding Dangdang, at least ten Japanese aircraft were hit by shrapnel in this wave of firefighting, two of which were severely damaged, and thick smoke began to emerge from the fuselage!

"Beautiful job! Keep going but don't stop! Let go!"

"Bang bang bang bang!"

With the command of the air defense force commander, a new round of anti-aircraft artillery fire roared out again, and this time it hit three Japanese aircraft directly!

The Japanese plane was blown up and turned into a rain of flowers!

In fact, the early anti-aircraft artillery efficiency was very low. For example, during the Battle of Britain in World War II, British air defense forces used 4,200 large and medium-caliber anti-aircraft artillery shells to shoot down a German aircraft. These anti-aircraft artillery and the cost of air defense of shells was about several times the cost of shooting down the aircraft.

The main reason is that the anti-aircraft gun air defense operations during this period usually use shells that are equipped with trigger fuses. The shells fired by anti-aircraft guns can only explode if they hit the plane.

The early anti-aircraft fire rate was relatively slow, so it was naturally very difficult to accurately hit high-speed aircraft directly, because this was a very unrealistic low-probability event, which led to inefficient air defense operations.

Therefore, if you want to improve the efficiency of attacking enemy aircraft, the best way is to let large and medium-caliber anti-aircraft shells explode near enemy aircraft, and use shrapnel all over the sky to kill enemy aircraft.

The bomber flies at an altitude of 10,000 meters. It is very small from the ground and it is difficult to observe, not to mention accurate hits.

Therefore, the most effective tactic is to use multiple anti-aircraft guns to shoot into the airspace passing through the flight route of the enemy plane, and to delay the fuse to cause the shell to explode at a predetermined height, forming a barrage of smoke, debris and shock waves within a certain range.

The anti-aircraft shells purchased by Yang Fan are all mechanical time fuses. The principle of action is similar to that of an alarm clock. It uses a set of tightened clockwork devices to schedule. When the clockwork rotates to a predetermined time, the firing needle is released to strike the fire cap and detonate the shell.

The time fuse can be set between 2 and 30 seconds. By accurately setting the detonation time, multiple shells can be detonated at different altitudes at the same time, thereby expanding the kill range.

Anti-aircraft shells using time fuses have significantly stronger air defense efficiency than shells that trigger fuses.

The Japanese plane ran very fast, and the first air defense interception position had only time to bombard four rounds of fire and shot down six Japanese planes. These Japanese planes disappeared without a trace!

However, these Japanese aircraft that rushed through the air defense interception positions were just happy not long after, the air defense positions located in Ju County began to show their power again!

With the same recipe and the same taste, the Japanese crew once again paid the heavy price of 5 aircraft.

Buzz, half an hour later, the Japanese aircraft group finally arrived over Fei County, but at this time, how could you see a huge number of tank armored regiments and transportation convoys?

Half an hour of early warning time is enough for the Chinese Tiger Army to use terrain, woods, and camouflage to hide.

"Baga! Bomb Feixian County!"

After losing his mind to bomb the target, the commander of the Japanese aviation fleet, who was extremely unwilling to accept it, could only settle for the second best and take the Feixian County town below as a punching bag!

Jijiujiu, and then he fell from the sky with high explosion bombs without any money, bombing the scene in Feixian County, which had been bombarded several times.

"Delay fuse 10-14 seconds! Prepare! Fire!"

Just as the Japanese aircraft group was circling and bombing over Fei County, more than 10 double-unit high-fire shots hidden in the fields outside the city suddenly opened fire violently, and the dense anti-aircraft shells rushed to the sky without any money!

Bang bang bang bang, more than 30 shells kept exploding at high altitude, and countless metal shrapnel shot wildly, forming a series of death radii!

The Japanese Aircraft Group did not expect Yang Fan to play the trick of taking action. Without any defense, seven planes were instantly blown up, and three other planes had thick smoke coming out from behind!

"Bagaya Road, damn Chinese pig, go to die!"

While these three Japanese aircraft fell rapidly, they rushed towards the air defense position crookedly.

"Hurry, take those three Japanese planes!"

"Damn it! If you want to be dead, you can't break the net!"
Chapter completed!