Although the German army lost many elite troops in the Battle of Stalingrad, the strength of the allies soared again after the US military landed in Europe one after another. The addition of the US new forces immediately made the Soviet army worse.

The US military quickly replenished the vacuum area lost by the German army and led the Allied team to block the Soviet counterattack. On the Soviet battlefield, although the Soviet army severely damaged the German Tiger tank with the m28a3 main battle tank and stable tail wing armor-piercing bomb, the number of tanks lost by the Soviet army was also huge. If it were not for the German Tiger tank number and insufficient production capacity, the Soviet army would not be able to defeat the German army. After all, the m28a3 main battle tank that the Soviet army relied on was just a medium tank, which was not at the same level as the German Tiger heavy tank. The advantages gained by the firepower of the armor-piercing bombs were not enough to be maintained for a long time.

As the US Ground Self-Defense Force went to the Soviet battlefield to participate in the war, the US military's m4 main battle tank was also a medium tank, with its speed, firepower and armor stronger than the Soviet T34. Compared with the Soviet army's m28a3 tanks, the speed and armor were slightly inferior, but the 75mm cannon equipped with the m4 tank was stronger than the m28a3 tank.

But this is not the point. What really makes the Soviet army tragic is that the Soviet army thinks that their tank output is overwhelmingly exceeding the German tank output and can win by volume. However, this does not work for the US army. The US military's m4 main battle tank has produced more than 30,000, and leaving 10,000 vehicles to deal with the Mexican army is enough. More than 20,000 m4 tanks will be sent to Europe to participate in the battle against the Soviet Union. The first batch of 6,000 m4 tanks have arrived on the European battlefield. This is undoubtedly a fatal blow to the Soviet army.

The US military replaced the German army as the main force to attack the Soviet Union, commanding more than 8 million alliance teams to fight against the Soviet army. The US military's armored tanks broke through the Soviet defense line like a flood. In less than a month, they took back all the positions lost by the German army during the Battle of Stalingrad.

However, the US military also has to face an unavoidable problem, that is, the severe cold of Stalingrad, and the US military's m4 tank also uses a gasoline engine. The tank's fuel tank and water tank quickly solidified in the severe cold of minus 40 degrees below Stalingrad.

However, the US military had studied the Battle of Moscow before coming to the Soviet battlefield and knew that the armored troops in the cold winter were extremely mobile, so the US military's armored troops always kept one-third of the tanks from shutting down until they were safely spent the night.

In this way, the attack power of the US tank troops is not affected, but it has a fatal danger, that is, the fuel consumption is too fast. Moreover, the gasoline used by the US military is different from that of Germany and cannot be replenished in Germany. It can only be transported from the US. This causes the US military to attach great importance to maritime supply lines. Often, a fleet of only a dozen tankers will send twenty or thirty light cruisers and destroyers to escort it.

Since the United States' merchant ships to Europe are often attacked by Song-class submarines from the Imperial Chinese Navy, this has caused huge economic losses and casualties to the United States. Especially in terms of strategy, European allies cannot receive US assistance and directly affect the situation on the Soviet battlefield.

In the past, American merchant ships and US ships did not turn on the active sonar system during their voyage, because if the active sonar system is opened all the way, it is undoubtedly equivalent to exposing their own position. This is because the active sonar itself will make sounds. The sound travels in the water, and the sound waves will reflect back after hitting an obstacle. It is monitored by the monitor and judges the size and distance of the target based on the time and intensity of the sound traveling in the water. Since the active sonar does not rely on the sound emitted by the target being tested, using the active sonar means that its position is exposed and provides convenience for enemy attacks.

In order to reduce the risk of navigation, American merchant ships and warships basically do not turn on active sonar on their way to Europe, and rely entirely on passive sonar to detect dangers under the sea.

Passive sonar does not make sound, it is a monitor used to listen to movements and stills in the water. However, if the target itself does not make sounds, or the sound is extremely small, then the passive sonar cannot detect the target. (The ocean noise floor is about 90db. If the submarine noise is close to this value, then the detectability is extremely low)

The Song-class submarines of the Chinese Empire grasped this key. The engine room of the Song-class submarine uses a sound insulation system. The tail of the boat uses a slewing body pointed tail, and is equipped with a shell rudder and a cross-tail control surface, an asymmetric 7-blade propeller and an elongated water droplet-shaped hull design, which makes the submarine's own noise very close to the oceanic environment noise, making it difficult for the enemy's passive sonar to recognize.

The shell of the Song-class submarine of the Chinese Empire uses the most advanced soundproof tiles. This rubber skin that imitates shark skin can reflect the detection waves emitted by the enemy's active sonar to the greatest extent, making it impossible for the enemy's active sonar to accurately determine the true position of the submarine even if the enemy's active sonar finds abnormal sound waves.

The Germans had no experience in anti-submarine areas before (it has always been an anti-submarine object), so Germany's anti-submarine sonar technology was very backward. It used the most primitive mechanical sonar arrays, which themselves had messy noises, which made it very difficult for the German Navy to use active sonar to find the Song-class submarines of the Chinese Empire.

However, this situation has been greatly improved by the US Maritime Self-Defense Force. The US Maritime Self-Defense Force was an ally of the British and French Allied Powers during World War I. The advanced anti-submarine technology and experience accumulated by the British and French Allied Powers have been shared with the United States for many years, so the anti-submarine equipment and strength of the US Maritime Self-Defense Force are very powerful.

Even so, the US Maritime Self-Defense Force was defeated in the early anti-submarine operation of the Arctic Ocean route and was beaten by the Song-class submarines of the Chinese Empire. But soon the US Maritime Self-Defense Force equipped the US warships with the most advanced sonar array. Although passive sonar still could not detect the Song-class submarines of the Chinese Empire, the active sonar technology made phased progress and made great progress in the judgment of echo waves.

Despite this, when the US Maritime Self-Defense Force escorted US merchant ships, it had to turn on the active sonar all the way, and the entire route was filled with ticking sonar detection sounds. It was used to scare the submarines of the Chinese Empire in the sea, hoping that they could retreat after hearing the sound.

It was through this method that the US Navy was able to relax for a month. During this month, the United States sent 400,000 troops and millions of tons of military supplies to Europe, solving the urgent needs of the Allies.

However, the Imperial Chinese Navy quickly adjusted its combat mode. After understanding the escort mode of the US Navy, it quickly organized targeted counterattacks.

On January 5, 43, a reconnaissance aircraft of the Imperial Naval Air Force discovered a huge American fleet on the North Atlantic Ocean. There were as many as 400 merchant ships, cargo ships, troop ships, arms ships and oil tankers, and the escort warships exceeded 60 surface warships and submarines of various types, including five heavy cruisers and eleven light cruisers, with great momentum.

The Imperial Chinese Navy Submarine Fleet Command immediately launched combat deployment. In order to support the Soviet Union to resist the invasion of the Alliance, their logistics systems must be destroyed as much as possible. The US military's logistics mainly came from maritime supply lines. Therefore, attacking US troops, arms ships and oil tankers became the top priority. At the same time, in order to further anger the United States, the Imperial Chinese side issued an order to allow attacks on civilian merchant ships on cruise ships to the submarine Fleet Command.

A pack of wolves composed of 45 Song-class submarines followed the sonar of the US military and quietly arranged the ambush area.

At around 9 a.m., with the command of the wolf pack commander, 45 Song-class submarines immediately launched an attack.

Once the torpedo is launched, it is immediately detected by the sonar system of the US warship. At this time, the US sonar equipment has achieved performance improvements and can capture the noise of the torpedo as soon as possible (after taking this torpedo for several months, it can obviously accurately lock in the noise during its underwater launch), and quickly determine the approximate position of the opponent's submarine based on the sound source.

US warships quickly launched anti-submarine warfare, and a fierce submarine warfare and anti-submarine warfare broke out.

The Chinese Empire Navy did not expect that the US anti-submarine capabilities had been greatly improved. As a result, as soon as the war started, it was disrupted by anti-submarine torpedo, anti-submarine rockets and anti-submarine deep-water bombs launched by the US ship, and three Song-class submarines were injured. For Song-class submarines, the sound insulation tiles of the imitation shark skin in the shell were destroyed by more than 3%, the noise would increase. It was easy to be detected by the sonar system of the US ship. Among the three injured submarines, two of them were below this level of damage and could continue to fight. Only the Electric Eel submarine was seriously injured, and the sound insulation tiles were destroyed by 12% of the noise and increased to 130 decibels. They were first locked by the passive sonar of the US ship, and then the active sonar of the US ship came. After the shell was severely damaged, the sound wave scattering ability of the Electric Eel submarine was also greatly reduced, and was locked by the active sonar of the US ship.

At the critical moment, the Electric Eel dived below 200 meters and withdrew from the battle sequence, left the battlefield as fast as possible, and headed towards Iceland.

The US ship York City light cruiser, more than a dozen warships, chased after them like cats that smelled fishy, ​​and vowed to sink the submarine. But the more important thing was to expose the underwater conspiracy of the Chinese Empire so that the Chinese Empire would fall into an extremely passive situation of public opinion.

The Electric Eel submarine fled all the way to Iceland. The Imperial Navy Atlantic Fleet, who received the report, urgently dispatched eleven warships from Scarpa Bay and went to the waters near Iceland for military exercises to cover the Electric Eel submarine to escape.

Although the Song-class submarine was very advanced, the continuous high-speed underwater navigation made its electricity consume very quickly, and it quickly had to start the diesel engine to charge, which caused the air consumption to accelerate. At 2 o'clock in the afternoon, the Electric Eel submarine was forced to float 66 nautical miles north of Iceland, and the U.S. ships rushed to it quickly surrounded it.

Captain of the York City, Lieutenant Colonel Vinson, boarded the Electric Eel submarine in a small boat, and Lieutenant Colonel Wu Gang, captain of the Electric Eel submarine, received him on the deck.

Looking at the huge Electric Eel submarine, Vinson was very surprised. He stepped on the soft and slippery submarine shell under his feet. He could guess that the submarine used high-quality materials to make the US military's sonar unable to detect. When he saw a large area of ​​scale falling from the port side of the bow of the Electric Eel submarine, revealing the steel armor inside, he guessed that this part must have been injured, which caused the submarine to be detected by the US military's sonar.

The evidence was conclusive, Vincent said coldly: "Colonel Wu, you can't deny this time, right? Your country's navy attacked our ** ship and merchant ship, and now the people are stolen!"

Wu Gang snorted coldly and said sternly: "I don't know what you are talking about! You first surrounded my submarine unreasonably, and then slandered me and attacked your warships and merchant ships. I hope you understand that your behavior has seriously violated the freedom of navigation in the Imperial Navy of the Chinese Empire. You are provoking the Imperial Navy, and you have to bear all the consequences!"

Vinson was stunned at first, and then smiled and said, "You can't help but admit it. Look at your submarine, are you injured? Was it fired by our anti-submarine bombs? In the words of you Chinese, this is called ironclad evidence!"

Wu Gang laughed a few times, making Vincent shudder. During this period, Wu Gang quickly thought about his words and said, "My submarine was injured, but it was not beaten by you. We are conducting exercises in the waters ahead. My submarine was injured by the Red Anti-Submarine bomb. After being judged to be sunk, I withdrew from the exercise. My submarine just left the exercise area and floated out of the exercise!"

Vinson pointed to the damaged area and said, "It's just an exercise, how can it cause substantial damage? The exercise is just a fake shell. Please use this to excuse me!"

"That's your country's exercise!" Wu Gang said with confidence: "The reason why our Chinese Empire Navy can firmly hold the throne of world overlord is because of real skills. The weapons and ammunition used in our exercises are close to live ammunition."

Vinson was so angry that he clenched his teeth and said coldly: "I don't care what excuse you use. Now you have fallen into my hands, so you can't help! Take it away!"

"You dare!"

Wu Gang shouted loudly, and his subordinates also took out their weapons and confronted the US soldiers brought by Vinson.

Both sides were tense and were on the verge of breaking out.

At this moment, a battle alarm suddenly sounded on the sea surface, and a fleet of the Imperial Chinese Navy sailed towards this side.

Since there is a battleship and an aircraft carrier in the Chinese Empire fleet, its overall strength is far stronger than that of Vinson's hands.

Soon, the main gun of the Imperial Chinese Navy's battleship, aimed at the York City, and the fighter jets on the aircraft carrier of the Vanjingshan took off and flew around Vinson's fleet.

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[The cruiser, which has always been very lazy, went to the book review area today and found that some netizens complained about the sonar issue. Therefore, this chapter gave a special explanation. I hope to solve the problem of everyone. I would like to thank everyone for their support as always. I hope everyone will give more valuable suggestions!] (To be continued. If you like this work, you are welcome to come to Qidian to vote for recommendations, monthly votes, and your support is my greatest motivation.).rt!~!

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Chapter completed!