While understanding the purpose of Soviet Russia, Dong Ku began a painful action to tear down the east wall and make up the west wall.

He originally mobilized some of the long-range artillery along the Suifen River and Hutou, but instead mobilized most of the artillery, leaving only a small number of artillery more than fifteen kilometers in those places, only Hutou Fortress, where ten 105-heavy cannons were left, in order to block the main artery leading to Vladivostok.

Japan's heavy cannon, which can hit 20 kilometers away, can directly block the 'Dalenevchensk' railway, and also cut off the transportation and supply line in Vladivostok, so that the other side will not act rashly and dare not launch an attack at will, after all, once a war starts, supply is the most important.

At the same time, a large number of antiaircraft artillery pieces were transported to Mongolia, and Dong Ku had no choice but to strictly defend them and set up several interception nets with antiaircraft artillery to stop the Soviet Russian bombers.

Dong Ku's approach has been verified and confirmed that it is the most correct at present.

Three days later, after three successive air raids and heavy losses, Soviet Russia gave up its strategic purpose of bombing small targets in Mongolia on the fourth day.

While they gave up, they were also extremely shocked, shocked that the advance army actually had such a fierce and effective means of air defense, those anti-aircraft guns, the first batch of heavy bombers lost a few units, the second round of bombing dispatched 150 planes, rushed to three new targets, but unexpectedly all of them were destroyed by unknown weapons, so that their flight at an altitude of only 1,000 meters turned into a dead air show.

When the second group made a detour, 80 light bombers and heavy bombers, escorted by 10 destroyers, could not escape the doom of destruction, and even the destroyers that flew fast and climbed up turned into flames in a matter of seconds.

The repeated losses puzzled Lao Maozi, when did the opponent's air defense become so sharp, and the bearded man personally ordered. To let a mixed formation of 60 planes conduct fire reconnaissance, it is necessary to understand the enemy's air defense means. However, they still did not escape the fate of being shot down, and the most painful thing is that they failed to find the opponent's air defense means. It was only before being hit that the pilot saw clouds of smoke. I heard the sound of the explosion, felt the air flow generated by the explosion, and then the plane rained down like a banana and the moans of being hit, followed by either the wings were broken, or the pilot was killed, or the engine was hit, the operating system was damaged, and there was nowhere to hide anyway,

Even the reconnaissance planes mixed in the formation did not detect the target, only when they were lowering altitude. The light of the machine gun was seen, and with it, it was shot down.

What's more, the moment the plane was hit, it exploded and disintegrated directly in the air, and it seemed that it was hit by an artillery shell. But they couldn't see the location of the artillery.

They knew there that Dong Ku's current anti-aircraft artillery and machine guns were all using camouflage nets, in the area where the withered yellow weeds were exposed. The same yellowish camouflage net made it impossible for enemy aircraft to see the guns and trucks under the net, as for the flames. During the day, the flame light is weak, and coupled with the altitude and distance of the aircraft, it is difficult for the naked eye to see the fleeting faint light. Although those machine guns do not have a locking function, the density and speed of the fire are not something that the current Soviet and Russian bombers with a speed of only more than 200 kilometers can dodge, and the advance design of the sights allows the shells to accurately hit the aircraft. And not eat ash in the back of the plane.

What they don't know is that although the advance force does not have air raid observation posts outside the country, it does have listening machines that are still in the research stage in various countries. This is different from a hearing device, which requires good ear strength, and bulky equipment and several large ears. Electronic listening devices are actually a variant of radio. It is a simple product of the predecessor of radar, which is used to detect the direction and approximate altitude of enemy aircraft.

The anti-aircraft guns of the advance army have built-in steel balls and time-delay fuzes, so as long as they fly in a general direction and at an altitude. In this way, it will be difficult for enemy planes to escape the interception of antiaircraft artillery that has the ability to maneuver, and it will be difficult for them to escape the large net woven of steel balls.

Soviet Russia suffered heavy losses one after another, temporarily abandoned the plan of aircraft bombing, and intensified its offensive while building a semi-permanent airfield near Lake Baikal.

Although Soviet Russia suffered a big loss, Dong Ku was just as uncomfortable here.

He removed most of the anti-aircraft artillery in Harbin, especially the anti-aircraft artillery and machine guns carried by trucks. The number is already two-thirds of the Harbin antiaircraft artillery, and it can be said that Dong Ku is cutting flesh to mend sores, and if the planes come to bomb Harbin again, then, even if some planes are shot down, Harbin will become a sea of fire and suffer heavy losses.

However, Dong Ku did not dare to move the anti-aircraft artillery in the industrial park, which is the top priority, there are still more than 300 anti-aircraft guns erected, 100 mobile, and there are camouflage nets, even the factory buildings are covered by camouflage nets, and it is difficult to find a large number of factories here if they are not close to dozens of meters.

Camouflage nets, which are currently no means of warfare used by the state, play a huge role at this time, and in the summer, green camouflage nets will make it more difficult for enemy aircraft to detect.

Soviet Russia gave up air strikes, and without understanding the other side's means, they chose to continue attacking their positions and not using air raids.

At present, this kind of attack is not a trick at all, every place is fierce and abnormal, and it is quite tragic, as if the Soviet Russian army is determined to attack hard.

But soon Dong Ku found out that this was still a feint, although it was very fierce, but after the Soviet Russian troops met with resolute resistance, they held out for more than ten minutes, and quietly withdrew from their positions, and in less than half an hour, they launched another attack, so that the soldiers of the advance army were tired of defense and consumed ammunition.

Fortunately, the range of the sniper rifles of the advance army was long enough, so that every time the Soviet Russia attacked, dozens or hundreds of corpses would be thrown down, and they could not be transported back and become trophies of the advance army.

Those who tried to get close to the corpses, and the wounded deliberately left behind by the advance army, really made the Russian troops suffer. If you don't save it, you can't watch the painful struggle of your comrades, and if you go, you can't stop the other party's attack, and often in order to save an injured person, you have to take the lives of a few, or even more.

In addition to the cavalry raid and the close to the position to give the advance army a certain number of casualties, the Soviet Russia failed to make a profit several times, and even the tanks were the same, in the case that the opponent's artillery could not be suppressed, Wangwang could not even enter the firing range, and lost nearly half of the enemy's intensive artillery fire. When they got closer, within five or six hundred meters, they could not stop the bombardment of the opponent's peculiar anti-tank guns, and the observers, seeing only the muzzles of the guns spitting fire, did not know what the barrels of the guns hidden behind the branches looked like.

Although Dong Ku's cutting and mending sores was a little more dangerous, fortunately, the Japanese plane was already timid, and did not launch an air raid on Harbin and Qiqihar, so that he dispatched anti-aircraft artillery to replenish it within ten days, so that Harbin would become a hedgehog again.

Skoinovich had a headache at this time, there was no way to deal with the anti-aircraft artillery of the ancient advance army, only by waiting for the nearby airfield to be established, and the concentrated bombing could be effective, or the current continuous attack, the intensive attack at various points, so that the advance army was tired of defense, consumed ammunition, saw the opportunity, covered it with artillery, and broke through a little, even if it was worth destroying the artillery.

This plan was finally finalized, and even the bearded man felt that there was no better way, even if the tank desperately pounced, it could not stop the opponent's shells. Only attrition and protracted warfare can drag down the opponent.

At this time, I originally thought that giving Lao Maozi a few ruthless blows would make them shrink for a while, so as to relieve the pressure, so that Dong Ku could devote energy to the development of military industry and the erection of railways, and the Mongolian mineral deposit transportation meeting Harbin, and the desire to solve the demand for a large amount of steel there was frustrated.

During the battle, which lasted for nearly ten days, the migratory army remained uninterrupted. And the veteran also learned a shocking news, that is, the advance army did not have the support of Soviet Russia, those Soviet Russian weapons were actually robbed by them, and they also occupied the entire territory of Mongolia.

"Niang Xipi!!"

Old Jiang had a headache. According to the information transmitted back by the intelligence officers who infiltrated Mongolia, Soviet Russia and the advance army are in a big war, and they have been fighting for some days, and they are still stalemate.

Lao Jiang was surprised, how much energy the advance army has, just relying on the big fart of Heilongjiang, what do you expect to confront the two powerful countries? And it really stood up.

Lao Jiang didn't know that Dong Ku was forced to do so. He can drive away Japan with millet and rifles, but it is not something that can be done in three or two years, nor can it be done by a unit of Dong Ku, if you want to drive away Japan, the only thing that can be solved is weapons and logistical supplies, and the source of these depends on having enough resources, speaking of resources, it is natural to come to Mongolia to occupy minerals, otherwise, what will he use to build tanks and artillery?

After Lao Jiang learned that Dong Ku was fighting against the two countries, he did not admire it, but was jealous. The combat effectiveness of the advance army is too strong, once they are allowed to gain the upper hand, then they can pay it back? I am afraid that I will not be able to sit in prison.

It seems that they should add some trouble to the advance army, let them develop more slowly, or if they gain power, they will be in an air crash, although they have given so many weapons, but they have not said that they want to cooperate with them or be co-opted.

So, under this thought, he summoned Liu Yucheng, who had not yet left, and asked if the recruitment was going well and if there was anything that needed to be solved.

Liu Yucheng was vague, did not explain that the meeting was enough, and did not ask for anything.

After the meeting, Lao Chiang came to a conclusion, that is, the advance soldiers did not mind coming more civilians.

So, he secretly ordered some places to help with propaganda, advocating that Didi in Heilongjiang could produce oil, and that he could not see the end of the land for a day when he let the horses run, so that some people who were still hesitant also joined the gradually scarce migration team and rushed to Zhangjiakou.

Liu Yucheng quickly learned the news, he didn't stop it, anyway, the more the merrier, survive the summer, the autumn grain comes out, no matter how many people there are, there is no problem. Therefore, as soon as he didn't know what to do, he still gave the weapons to Lao Jiang in batches according to the original agreement, and continued to open the door to receive those migrating people. (To be continued......)