The news of the discovery of the submarine was temporarily suppressed in the Sima Mansion and the cabinet, and Jiang Yu thought that after the submarine arrived, he would give a big surprise to public opinion and the envoys of the princes.

After replying to King Xian, Lu Gao returned to Sima Tang again and called Bai Liyan.

Bai Liyan had received a call from Zhang You before, but Zhang You did not know the details and did not make it clear, Lu Gao's phone call detailed the details of the capture and the size of the submarine.

According to Gao Pei's description, the submarine was more than six zhang long, cylindrical olive-shaped, and about one zhang and six feet in diameter at its maximum, and the actual geometric dimensions may vary.

There are propellers and rudders in the stern, and there is a boss in the upper part of the middle section of the hull, which is supposed to be the submarine as a hing, and there are a number of iron pipes protruding from the enclosure, and it is the submarine that the fishermen found with the iron pipes.

Compared with gasoline and diesel internal combustion engines, the biggest advantage of alcohol internal combustion engines is that there are fewer smoke and pungent gases during combustion, and there are almost none.

However, the technology of axillary submarines is quite backward, there is no battery and electric motor technology, so they can only rely solely on the internal combustion engine to drive, underwater navigation must expose the snorkel, unless it carries compressed air and liquid oxygen, but the carrying capacity is not enough to maintain a relatively long underwater dive, and its technical ability is relatively limited, these submarines can not dive too deep.

As a result, the dust settled, but Bailiyan did not feel relaxed, the reason is also very simple, in the inland river, you can use the limitations of axillary technology, and the manpower of human fishermen, spread manpower on the river, engage in crowd tactics, and make a sieve over and over again, and it is impossible to be vigilant every day and night, only to be a thief the day before yesterday, there is no reason to prevent thieves for a thousand days. And once in the sea, a large number of submarines are bound to pose a major threat to the Navy.

Due to the lack of sonar technology, these submarines are difficult to detect, and even more difficult to detect at night, carrying one or two torpedoes is enough to threaten the safety of the entire fleet.

"Ran, what advice do you have for dealing with submarines?"

"With the current technical conditions, passive sonar can be developed, but the effect will not be too good, the action distance will be very close, and the clutter of marine and aquatic animals seriously affects the recognition rate of early low-tech passive sonar, so before the emergence of electronic technology and screen display technology, there is no difference between there and no.

But you don't have to worry too much, under the constraints of technology and concept, it is not enough to evolve a deadly submarine weapon in the short term, and it is relatively easy to defend. ”

"Okay then, I'll deal with it when I see the real thing when I go back."

Since the birth of submarines, it is destined to be a huge trouble in the military field, and it is not easy to fight against submarine under modern technical conditions, and at present anti-submarine is simply an extravagant hope, and Bai Liyan hopes that the technology of the armpit is not mature, and it will not bring big losses to the Xian army in the short term.

But the key thermal bomb is still a hidden danger, and it is so powerful that it can cause mass casualties and economic losses without the need for accuracy at all. He still couldn't pay attention to this, and walked out of the barracks to inspect Mo Yunfeng's position outside the city.

Since the discovery of the tunnel, the coalition forces have secretly organized a search work, digging a large pit in the ground and filling it into a water tank to listen to the underground sounds, using a listening urn and the ground to find the vibrations from the ground.

The listening urn is a variety of war utensils, which can be pottery, porcelain, or cowhide and bamboo tubes, which are placed on the ground to listen to the echoes from the ground.

The "ground listening" is a metal stick, a sealed urn jar or leather drum combination of appliances, when used to bury the sealed urn or leather drum deep underground, in the use of a metal rod from the surface of the ground into the ground, against the urn cylinder. In this way, the different densities of soil, rock, and urns are used, and the rate and frequency decay of sound propagation are different, and echoes from the ground are heard.

Therefore, in the past ten days, hundreds of underground sound sources have been confirmed within a radius of 20 miles inside and outside Liangxian County, including the sound of excavation work and the sound of walking and moving, three or four zhang from the surface, and the deepest part may be seven zhang thick.

At the same time, Bailiyan put on a counteroffensive posture, using trucks to bring in more munitions, openly or secretly piled up on the surface of the tunnels and underground spaces, and now only waiting for an opportunity.

In the blink of an eye, the temperature has dropped very low, and the sea breeze is affected by the atmospheric circulation, subtropical cyclones and the North Ocean Current, and the wind blowing from north to south begins to blow from south to north.

On the sixth day of the first month of October, Bailiyan allowed the airships to carry a small number of chlorine bombs for the first time to carry out poison gas attacks on the armpit positions, which greatly annoyed Lieutenant General Cross, and in just one bombardment, the chlorine gas caused him to lose more than 200 casualties.

In fact, during the last year's fighting, the armpits have seized some gas masks and tried to imitate them, but the physiological structure has made it more difficult for them to develop gas masks.

Armpitary eyes grow in the left and right armpits and the center of the forehead, and the facial features of humans are concentrated on the face, so the structure of human gas masks is not conducive to their protection, so so far, they have not been able to imitate their own gas masks.

Despite the rampant human bombardment, Cross was helpless and had no choice but to be beaten, but it was not all without good news, and the confronting coalition forces could hear the sound of gunfire every night, which has become more intense recently, even during the day.

Due to the large number of tracer bullets used by the Xian army, which increased the field of vision of target shooting at night, Cross initially thought that it was human target training at night and did not care. However, the gunfire for several days was chaotic and disorderly, and some shouts could even be heard at the front, which really did not look like night target training, and he judged that it was human infighting.

He believes that there is also disharmony within the human race, and that huge casualties and economic losses will cause them to fight among themselves, and the gunfire for more than ten days or even during the day may be their internal strife.

When Cross was inclined to this speculation, the seventh, eighth, and ninth days of the first month continued to shoot day and night for three consecutive days, and spread from the city of Liang County to the forward position, reaching a peak on the night of the tenth day of the first month.

That night, Cross had gone to bed, and the days of gunfire had made him accustomed to resting among the guns, but the adjutant Nord still woke him up in the early hours of the morning.

"Your Excellency, there are fierce explosions and loud shouts from the alien animal position."

Cross got up and jumped out of the covers and opened his eyes, carefully discerning the fierce gunfire and shouts in the air. After listening for a long time, he said calmly

"Take the Guards and go to the front line."

"Yes, Your Excellency."

Cross drilled out of the fortifications and walked more than ten miles through the communication trenches to the trenches facing each other at the front. On the way, he saw the fire of the human position, and when the gunfire became more and more intense, the sky was full of white, red, green, and yellow balls of light, like a grand fireworks.

Cross observed for a long time, but he was still confused, human infighting is naturally a good thing, but he has always thought that the commander on the opposite side is a smart human, so the internal strife of human beings under the current enemy should be controllable, and in the face of huge external military pressure, they should be able to stop in moderation, so the infighting will not expand to the entire level.

But now the situation is that there are guns everywhere inside and outside the city, and even small explosive weapons are used, and this level of armed conflict is no longer internal strife, but civil war.

After observing for a long time, Cross was unable to determine the nature of this infighting, but it was beneficial for him that this infighting continued to continue.

At this time, his adjutant Nord put down the binoculars and said to the side

"Your Excellency, if the internal strife of the alien beasts continues to expand, we may be able to easily defeat them in the near future."

"Let's hope so, the order is to the forward positions, no matter what happens, no attack is allowed tonight."

"But if you attack them at this time, it may have a surprise effect."

Nord suggested, and Cross shook his head repeatedly, saying

"No, humanity is different from us, our alliance is guaranteed, and theirs is built on common interests and external pressures. If we exert external pressure at this time, it will force them to unite here, which is not good for us at the moment. Keep waiting and wait for two days. ”

"Yes, Your Excellency."

Cross continued to observe for another quarter of an hour, making sure that the human infighting showed no sign of subsidence, and returned to headquarters in the middle of the night, but was startled by a loud noise behind him on the way back

"What's going on!"

That's when Nord said

"It's like an explosion at an arsenal."

Before Nord's words fell, Cross climbed the wooden ladder near the traffic trench, climbed to the ground to look at the position of the coalition forces in the south, only to see more than ten miles to the southeast, a huge flame rose into the air to illuminate half of the sky, fierce explosions occurred one after another, and even faintly saw panicked humans fleeing for their lives in the telescope.

Before he could continue to look closely, another violent explosion came from the southwest, this time the explosion was even more violent, at least more than twice as large as the southeast explosion, and even caused a riot in the front line of mankind.

"Your Excellency, it must have been the infighting of the human race that detonated their own arsenal."

As soon as Nord's words fell, a third explosion occurred, this time in the city of Liang County. That's when Cross said

"Maybe it's good news, let's go."

Cross wasn't happy, the enemy's infighting could indeed increase the chances of victory in the next military operation, but they knew that this luck was a fortuitous event, and it was impossible for humanity to weaken their industrial capacity because of a single infighting, so the future battles would still be so brutal.

At the same time, Bai Liyan and the generals and their garrisons had already withdrawn from Liang County and retreated to five miles outside the south gate.

Looking at the sky-high fire in front of him, Zhao Huan couldn't help but ask

"With so many explosives, it's enough for one country."

Bai Liyan nodded

"As long as the goal is achieved and casualties are avoided, it is worth spending some financial and material resources."

When these words reached the ears of Yu Kang, the governor of the Liang army, it was a different taste.

In Yu Kang's view, Xianguo has been extravagant enough to use good explosives and oil, just to blow up some tunnels, and in the long run, Liang Guo is not an opponent of Xianguo in any way.

In order to prepare for this fireworks show, Bailiyan spent tens of thousands of tons of explosives, gasoline, detonators, and black powder, and in order to increase the depth and area of the explosion, Bailiyan used thousands of blasting canisters to insert them into the ground, and took turns to blast them under the cover of explosion and night.

The three explosions just now are just the beginning, and the highlight of tonight is yet to come.

。