After the four planes formed a formation at a low altitude, under the leadership of Mike's No. 001 long plane, they climbed to a high altitude, and the group stopped climbing at an altitude of 5,000 meters, which is almost the maximum ceiling of the DH-10, and then switched to level flight to the north.

Gao Zhihang, who was sitting in the back seat of the coach, looked at the dark night sky outside the cabin dotted with stars that were far brighter than they looked on the ground, and his heart was excited. Although he was a skilled flyer, he had never flown at night.

At this time, because there is no radar, and there is not even an instant communication facility, as soon as the pilot leaves the ground, he will not get any support from the ground, and if he wants to fly to the target, he can only rely on the direction and obvious landmarks on the ground to arrive safely and unmistakably. At night, the pilot cannot find a valid target on the ground, so the aircraft at this time does not perform flight missions at night.

Not to mention winter, it is the scorching summer, the temperature at an altitude of 5,000 meters is extremely low, and at the moment it is even more cold under the action of the strong cold air flow in Siberia.

Although the DH-10 is an old aircraft produced at the end of World War I, it can almost be said to be a completely new aircraft after modification. Not only has the internal structure and surname of the aircraft been greatly changed, but the cockpit has also been changed from the original open to closed, and a sliding glass shield has been installed, so that the pilot can avoid direct exposure to cold air.

Despite this, the biting cold air snorted into the cockpit through the holes under the shroud. This is not because the quality of the Fourth Route Army's improvements is not up to par, but considering that there is no reliable anti-frost heating device for the aircraft windshield at this time, if there is no intentional hole in the cockpit to keep the air temperature inside and outside the cabin roughly consistent, the air exhaled by the pilot will soon be covered with frost on the aircraft windshield.

Outside the porthole, except for the dark night and a little starlight, nothing else could be seen, Gao Zhihang tightened the collar of the leather flight suit again, turned his head and looked at the training plane again.

For these two training planes modified by the Fourth Route Army, Gao Zhihang admired the refiters from the bottom of his heart. Modifying an aircraft is not as simple as imagined, it is not something that can be done by simply adding some equipment and facilities, and it is no less difficult to successfully modify an aircraft than to design a new aircraft.

When it comes to adding steel armor to the DH-10, the difficulty is not ordinary. The thickness of the armor is not as thick as possible, otherwise it will affect the bomb load and speed of the aircraft, and in order to minimize the impact of the additional armor on the aircraft, the thickness of the armor should also be different everywhere. Not only that, but it is also necessary to consider whether the balance of the modified aircraft, climbing, diving, turning, rollover and other tactical surnames have not been greatly affected, and even some surnames can be improved.

In addition, these planes were equipped with the Fourth Route Army's self-made Guo's bomb targeting device. When Gao Zhihang was in France, he had heard of the invention of the Sperry bombsight by the Americans, but he had never seen it, and it is said that this kind of sight was classified as top secret in the United States, and it was stipulated that it could only be installed on airplanes before they took off in wartime. America's allies, the British and French air forces, wanted to get their sights, but the Americans treated their Sperry bombsights as treasures, and they didn't sell them. The current Kwok sight can be controlled by the pilot alone, and it should be more advanced than the Sperry bomb sight, although Mike said that its high-altitude aiming surname can be average, but the accuracy rate of medium and low altitude is extremely high. Moreover, what surprised Gao Zhihang the most was that, according to Mike, this sight turned out to be the design principle provided by Song Zhewu, developed by him and an engineer surnamed Guo.

Even Mike, who had never known what modesty was, said he was working on a new airplane with the engineer he highly praised!

All the experiences during this period of time made Gao Zhihang novel, amazed, and even excited, everything in the Fourth Route Army showed a kind of vitality, and everywhere was filled with a vigorous and upward atmosphere that he had never felt in the Northeast Army. All this deeply attracted him, although he was still wearing the uniform of the Northeast Army, he was used to being called the chief of staff, and he now regarded himself as a member of the Fourth Route Army.

There is also this transceiver next to me, which should be the first in the world to put a radio station on an airplane. It can transmit all kinds of information found in the air back to the ground in a timely manner, without waiting for the landing to report......

"Bang bang", the knock on the glass partition in the middle of the front and passenger cockpit interrupted Gao Zhihang's thoughts, and Mike pointed in the direction of 2 o'clock. A dark red light appeared in the dark background at 2 o'clock, and this light flickered and flickered under the action of the chlorium in the air.

"Firelight", Gao Zhihang shouted happily. The fire that can be observed at an altitude of 5,000 meters must not be small, and it seems that the task force has really set a mountain on fire.

Mike shook his wings, motioned for the planes behind him to follow, and then adjusted course and flew off at the firelight.

Gao Zhihang turned on the radio and sent a signal to the headquarters that the fire had been discovered.

As time passed, the darkness of the night gradually began to fade, and the fire, which was only a little at first, gradually became bigger and brighter, as if a torch had been erected on the distant horizon, guiding the group to fly towards the target.

Gao Zhihang looked at the speedometer, then looked at his watch, silently estimated the time, knocked on the glass between the two cabins, gestured to Mike who turned around, and told Mike that there was still about 40 minutes of flight from Dauri.

Mike grinned, his index finger and thumb circled together, and made an OK gesture, and from Mike's smile, it could be seen that Mike was in a good mood.

After another 20 minutes of flying, Mike shook his wings again and turned off his night lights. This is the light that Mike is afraid that the Soviet observation post on the ground will find the plane, after all, the light that moves regularly in the air is easy to spot.

At this time, the black of the night sky has become very light, the eastern sky has turned grayish white, and it is estimated that it is still about 50 kilometers away from the Dauri airport. The "torch" on the horizon no longer had the shape of a torch, and the fire had expanded a lot to the south, probably spreading to the bottom of the mountain, and the firelight was like a red cloak draped over the body, and under the blowing of the north wind, hunting and dancing.

Gao Zhihang knows that the forests in this area from Hailar to Chita in the Soviet Union are made of pine and birch, which are already flammable in the cold and dry winter, and once they catch up, they are difficult to extinguish. Just looking at the fire, there is at least fifty or sixty miles away from Da Wuli, and there are still a few rivers between Da Wuli, and the fire basically can't burn in the area of Da Wuli, which makes Gao Zhihang somewhat regretful.

At this time, the sky was already bright, and he could already see the mountains on the ground dimly, Gao Zhihang carefully distinguished the landform, first found the railway, and soon found Manchuria along the railway, Gao Zhihang knocked on the glass partition, signaling that Mike was about to reach the target sky.

Mike shook his wings again, and another modified trainer plane slowly caught up with No. 004, and the four planes were organized into two teams of two. According to Gao Zhihang's guidance, Mike began to reduce his altitude, and at 1,000 meters, he could already see the Soviet army's Dauri airfield. In the mountains, the large area of flat fields makes the airport's location very prominent.

Mike slammed the nose of the plane and swooped down towards the airport.

Through the portholes, you can see two rows of planes parked on the tarmac on the airport, and a few more seem to have just been pulled out of the hangar, scattered at one end of the runway, which should be the Soviet army preparing for daytime bombing. Gao Zhihang was a little sorry, if it was ten minutes late, then the Soviet planes would be pulled out of the hangar, and they might even be refueling and hanging bombs, and the bombing effect would be the best at that time.

At this time, there was already chaos at the airport because of the arrival of these four uninvited guests, and the Soviet army never imagined that their opponents, those rookie pilots of the Northeast Army, could fly at night and appear above them early in the morning.

In the chaotic crowd, some people were desperately running to find a place to take refuge, others were running towards the air defense positions set up at the four corners of the airport, and some even ran to the plane as fast as possible. Judging from the outfit, it must have been the pilots and mechanics who rushed to the plane, and it seemed that the Soviet pilots still wanted to brave the bombing and force their takeoff.

In the roar of the aircraft engine, Gao Zhihang suddenly felt a slight tremor from the fuselage of the aircraft, like the feeling of a rainstorm hitting the glass window, Gao Zhihang knew that this was the Soviet anti-aircraft machine gun fired, but this 12.7 caliber projectile would not play any role at all in front of their protective armor.

The first thing Mike had to deal with was the anti-aircraft machine guns on the airfield, and only by destroying them could the two unarmored bombers behind him attack the Soviet planes parked at the airfield. Mike aimed the nose of the plane at the Soviet anti-aircraft position on the southernmost side of the airfield, leaned back as much as possible, and dived down on one side of the fuselage. The belly of the aircraft is protected by armor, but the glass of the cabin cannot be armored, and it cannot block machine gun bullets.

The DH-10 swooped down on the Soviet anti-aircraft position with a strange roar, and Mike did not press the button of the machine gun until he could almost see the faces of the Soviet troops, and with a tremor of the plane, the rain of bullets fired from the 23mm machine gun immediately made the small air defense position fly flesh and blood, and the Harchikis heavy machine gun mounted on the anti-aircraft mount even toppled over the chest wall of the bunker.

(To be continued)