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The little devil on the mountain Takeo is also fateful, just from the vast underground space to the previous Yongdao, he faintly heard a strange sound in his ears, this little devil didn't want to think about it, immediately extinguished the torch, and then shrank back, quietly hiding in the drainage ditch one meter high behind him.

Not long after the mountain takeo hid in the drainage canal, a hole was opened in the wall on the side of the road, and then the hole became bigger and bigger, but it turned out that it was also another passage, but it was previously killed by the Chinese with bricks, and the surface was plastered with mud for camouflage, so the Japanese search team did not find it.

But the mountain warrior hides in the drainage canal, looking from the light to the dark, but he sees it really.

Immediately afterward, more than a dozen armed men came out of the open passage, and what was surprising was that these armed men were also wearing Japanese protective clothing and gas masks, but Yamagami Takeo was very sure that these dozen armed men were definitely not Japanese soldiers, because the Japanese army would never come out of here.

Needless to say, these dozen or so armed men must be Chinese soldiers.

After these dozen Chinese soldiers came out, they immediately occupied both ends of the road, and two of them even walked to the entrance of the drainage canal and squatted down, but scared the mountain warrior half to death.

Immediately afterward, a fierce gunfire rang out in the underground space above.

Then, there were Japanese soldiers down the ladder, but they were shot one by one by the Chinese soldiers who had been waiting at the bottom, and occasionally those who were not shot were also ruthlessly stabbed to death by the Chinese soldiers with bayonets, and in less than a moment, the gunfire above stopped, and then a Chinese soldier climbed down the ladder and said something to the dozen Chinese soldiers below, and the dozen or so Chinese soldiers below began to clean up the battlefield, leaving temporarily with weapons, ammunition and the corpses of Japanese soldiers.

Taking advantage of the absence of the Chinese soldiers, Takeo Yamagami hurriedly rushed out of the drainage canal, ran back like a flying path along the road he came, and ran back to the ground in one breath.

On the ground, because he couldn't get through on the phone, Akira Muto was getting angry.

Seeing Takeo on the mountain crawling out of the entrance of the tomb, Muto Akira immediately rushed forward to pick him up and asked, "What's going on down there, why doesn't Matsui answer the phone?" ”

"Sir, it's all over." Takeo Yamagami took a breath and told everything he saw.

After Muto Akira listened, his heart sank, and then he quickly came to Kawaguchi Heiji and made a report.

After listening to the report, Kawaguchi Heiji's thick eyebrows tightened in an instant, this tunnel battle was far more difficult to crack than he imagined.

Kawaguchi Heiji said in a deep voice: "Judging from the situation that the search team was surrounded and annihilated, it seems that it is not feasible to attack directly in the tunnel, not to mention the casualties, and the efficiency is too low, and the maximum number of troops invested each time is only a small team, so when will this sweeping operation last before it ends?" ”

"Hello." Muto Akira nodded, "I also think that it is not a good idea to attack directly. ”

"So." Heiji Kawaguchi said again, "Is there any other way than a direct attack?" ”

Muto Zhang was silent, he couldn't think of any good way, this matter was really tricky.

"Is there really no other way?" Heiji Kawaguchi frowned, as if he was talking to himself, as if he was asking the staff officers around him, but none of those staff officers dared to answer, because for them, tunnel warfare was a completely new way of warfare, and they had not studied this at the Army University.

At this moment, Kokahara Junsi said, "Your Excellency, commander, there may be another way. ”

"What's the solution?" Heiji Kawaguchi's gaze immediately fell on Toshimi Oshihara.

Xiao Luyuan said: "Your Excellency Commander, according to the intelligence, there are five or six thousand residents in Meizhen Town, and if you add the residents of the surrounding villages, the number is even larger. ”

Kawaguchi Heiji looked at him and said, "You mean, find their drainage and smoke outlets?" ”

Five or six thousand or even tens of thousands of people live in the tunnel, every day to eat, drink, pull, scatter, pull and scatter the excrement produced by pulling and scattering needs to be excreted through the drainage system, eating and drinking need to boil water for cooking, boiling water for cooking will produce cooking smoke, these cooking smoke also need to be discharged into the air at the smoke exhaust outlet, otherwise the accumulation in the tunnel will smoke people to death.

As long as you find the drain or smoke vent, the rest is simple.

Find the drain and then block the drain, and then introduce the reverse irrigation from the tunnel entrance, the tunnel will be flooded, and the Chinese soldiers and Chinese people hiding in the tunnel will definitely die, if they don't want to be drowned, they can only obediently return to the ground and have a dignified decisive battle with the Japanese army.

After finding the smoke exhaust outlet, it is even simpler, just pour the poison gas into the smoke exhaust outlet, and the Chinese soldiers and Chinese people hiding in the tunnel will immediately be poisoned and die in large numbers, and then the rest of the thing is to send a team of anti-chemical soldiers into the tunnel to give the Chinese soldiers and the Chinese people an autopsy.

"Your Excellency Commander, I'm afraid it will be difficult to find the drain, because the water only needs to provide a diagonal downward passage to keep flowing, and the people of China can even dig a tunnel that connects directly to the Mei River outside the town, so it is difficult for us to determine the specific location of the drain." ”

Heiji Kawaguchi nodded approvingly, motioning for Toshimi Okahara to continue.

Xiaoluyuan Junsi said: "But the smoke outlet is not, because the cooking smoke is a kind of heat flow, the heat flow rate in the gentle channel is very slow, and will not flow down, only the smoke exhaust flue is built upward, and high enough, the smoke can be smoothly discharged into the atmosphere, so when the rural stove is repaired, the smoke outlet is generally built on the roof, in order to increase the vertical drop of the exhaust flue, increase the intensity of the smoke exhaust." ”

Heiji Kawaguchi nodded and said, "So what?" ”

Xiaoluyuan Junsi said: "Therefore, it is impossible to concentrate the discharge of cooking smoke like excrement, and the discharge of excrement can concentrate more than a dozen villages, but it is impossible to cook smoke, and the cooking smoke can only be discharged nearby, and the smoke exhaust outlet must be quite high above the ground, otherwise it will definitely lead to poor smoke exhaust." ”

"Yo Si." Heiji Kawaguchi nodded happily, turned around and shouted, "Muto-san? ”

"Hello." Muto Akira stepped forward and replied loudly, "What do you command?" ”

Heiji Kawaguchi said: "Immediately send out a search team to search the nearby terrain 24 hours a day, and if you find smoke somewhere, you will report it immediately." ”

"Hello." Muto Sho was stunned, and the leader turned around and left.

In a short time, Muto Zhang sent several search teams to carry out comprehensive monitoring of the fields within a radius of several miles of Xiaoli Village, but what made Muto Zhang extremely disappointed was that until dawn the next day, until Heiji Kawaguchi had returned to the headquarters of Meizhen, the search team sent out found nothing.

Muto Zhang, Oshihara and Kawaguchi didn't expect that the Dameishan Independent Regiment had already solved the problem of smoke exhaust.

According to physics, the hot air flow cannot flow downward, and the flow rate in the gentle channel is also very slow, so it is impossible to achieve centralized emission of cooking smoke, but the fact that cooking smoke cannot be concentrated does not mean that it cannot be concentrated in cooking!

The solution of the Dameishan Independent Regiment is to concentrate on making rice.

Choose a hidden col in the mountains, first concentrate on cooking, and then use manpower to send the prepared meals into the tunnel, and then send them to each village through the extensive underground transportation line, and send them to the bowls of every soldier and every common man, which cleverly solves the problem of emitting cooking smoke and eliminates the risk of devils attacking from the smoke exhaust outlet.

As for the cooking smoke emitted in the mountains, it is impossible for the devils to find out if it is blocked by the mountains.

What's more, even if it is discovered, there is no problem, it is a big deal to change places and continue to cook.

The Muto Brigade did not find anything in the surveillance of Xiaolizhuang, but the next night, the search team sent to Yangcun was attacked by the Chinese army again, and like in Xiaolizhuang, the Chinese army also used the tunnel to appear quietly, and then took advantage of the rest of the search team to launch a sudden attack.

Moreover, the search team of Yang Village was even more miserable than Xiao Li Zhuang.

The Xiaolizhuang search team managed to escape more than a dozen cavalrymen, but the Yangcun search team was collectively broken, and none of them were lucky.

After receiving the news, Kawaguchi Heiji was so angry that he dropped his water bottle, and immediately ordered that the various search teams sent out immediately withdraw, along with Muto's independent brigade.

Despite his inner anger, Heiji Kawaguchi did not lose his mind.

By this time, Heiji Kawaguchi had clearly realized that in the face of the tunnel warfare of the Chinese army, the Japanese army did not seem to have many methods, and it could even be said that they were helpless, and now the only countermeasure he could think of was to mobilize engineers to carry out blasting operations in the vast Dameishan Basin, and bomb all the tunnels of the Chinese.

But this is also to think about it, because it is not easy to carry out blasting operations, first, you have to determine the specific location of the tunnels, secondly, you have to ensure the safety of the sappers, and then the most difficult point, the cost of digging tunnels is even cheaper than blowing up tunnels, which is a war of attrition that does not worth the losses.

Although it has not yet reached the last step, Kawaguchi Heiji can already foresee the final result of this sweep, if there is no miracle, this sweep operation, probably can only end in failure, and now Kawaguchi Heiji feels extremely struggling with a question, should you withdraw your troops immediately?

[It's about to be 515, I hope to continue to hit the 515 red envelope list, and the red envelope rain will be able to give back to readers and promotional works on May 15. A piece is also love, and it must be better! 】