"Will a fleet war break out?" asked Prime Minister Asquith.

"The large fleet will definitely not enter the area near Dover Seaman during the day. This is seeking death. The German bombs may not be able to erase London, but it is absolutely possible that thousands of bombers will severely damage the large fleet. Moreover, I think the power of Imperial Aviation is not enough to support the fleet's air defense at present."

"As for the evening? There are mines deployed by us and the Germans here. It is dangerous for large fleets to operate in such a narrow area. Mines, submarines, and torpedo boats are all huge threats. You know, the narrowest part of the Dover Strait is only 20 nautical miles, while the large fleet has more than 10 kilometers in formation. This kind of place is simply impossible to fight, so the only thing that both sides can fight is light warships." Jericho said.

"Okay, I don't understand the specific things. Marshal Jericho can only say one thing, that is, the situation we face this time is worse than that Marshal Nelson was facing back then, and even more dangerous than the Dutch fleet entering the Thames estuary during the British-Dutch War. Therefore, you and the Grand Fleet must do their best." Prime Minister Asquith said at last.

The so-called professional matters must be handed over to professionals. This sentence is absolutely correct, especially as one of the most professional navy in the world, the Royal Navy cannot be said to be the first in all aspects, but overall, there are almost no shortcomings in all aspects. Even if they encounter some unprecedented situations, they can still respond in a short time!

And anti-submarine warfare is like this! Although the British's maritime transportation lines were still beaten so badly, to be honest, if the Germans were not facing Britain and replaced by another island country, they would have been dragged to death by submarine warfare long ago. Anti-submarine is not only a matter of financial resources and manpower, but also strategic thinking, coordination and command, etc.! The British took great pains to fight against submarine, but now, in order to allow more fleets to enter the Dunkirk port, they were forced to demolish all the anti-submarine systems they had worked hard to build in the Dover Strait.

So now someone is asking why it needs to be demolished? It is very simple to be willing. The first thing to be noted is that although the British army is backed by the port of Dunkirk, it has never been one of the main cargo throughput ports of the British army. After all, in the previous two years of battle, the German army had approached Dunkirk several times. It is common for the German ultra-long-range train gun to include Dunkirk in the range. After all, the German 380mm train gun can hit 40 kilometers when using flicker......

So before, it was usually transported some scarce materials and needed to be sent directly to the front line. For example, aircraft engines, vehicles or other technical equipment were not large in volume. Because they were close to the eastern section of the Dover Strait, it was a region where German submarines often came and went. Therefore, the British made up their minds and directly laid several anti-submarine systems for the Dover Sea Heroes. As the Dunkirk Port, it was the focus of defense. In addition to a not-wide and tortuous waterway, a large number of mines, anti-submarine networks and trawling patrol ships were deployed in the waters next to them!

Don’t laugh, it’s just a trawling patrol boat. Some people in the 21st century say that using fishing boats to fight submarine is a joke, but in World War I, the British really tried to use trawling to fight submarine! And what is even more incomprehensible is that this tactic has been successful!

There are two main ways for the British trawl anti-submarine. The first method is a single-ship trawl. Simply put, add a large tail about 500 to 1,000 yards behind the stern. The length of the tow lock between the ship and the trawl is 70 feet, in order to prevent the distance from being too close, causing the trawl and the ship's own propeller to be entangled. In order to ensure the stability of the trawl, two 50 tons of ballasts are hung at the lower end of the trawl. In order to mark the location of the trawl, there are no floating bodies made of glass on the trawl. This trawl tactic is actually not very effective, and it is mainly used in routine patrols in low-risk seas.

The second way to trawl anti-submarine is tow navigation with two ships. The two ships respectively cover the anti-submarine network. The two sides maintain a distance of 500 to 1,000 yards between the two sides, and then sail back and forth on the sea like plowing. It is very simple, but it is difficult to do. The two ships must cooperate with each other. Think about it, the large net nearly 1,000 meters is also very difficult to control under the impact of ocean currents. Moreover, the English Channel is not deep, and the deepest part of the Dover Strait is only 120 feet. Maybe when the trawl will hang it with reefs and other things on the seabed. Halfway down, ballast drops or glass floats fall off abnormally. So, to be honest, this anti-submarine technology is not very effective. It is not very reliable in theory, but in fact it is even more unreliable.

But in history, this tactic that is not reliable no matter how you look at it, it really played a role. As early as the beginning of 1915, the trawler cooperated with the destroyer to achieve the first victory! On March 4, 1915, the u8 submarine set out from the port of Ostend and entered the English Channel. During this process, the submarine would report to the headquarters every once in a while, and this regular radio contact naturally attracted the attention of the British. This time, the submarine was unfortunately targeted by the British Navy's Room 40, which was responsible for monitoring the U-boat operations. Then, on the way to pass this submarine, a submarine and a trawler blocked it!

The unlucky submarine was entangled by the anti-submarine net carried by the USS Bourne at 3 pm. Then, at around 4 o'clock, the u8 submarine's navigator, Suland, felt something abnormal. The submarine could not maintain the depth of navigation stably, and the submarine often swung continuously. The Germans who realized that they were entangled by the anti-submarine net after realizing that they were entangled by the anti-submarine net. As for the matter behind it, it was simple. In the end, the submarine was destroyed by the blasting minesweeper thrown by the destroyer Kuka. (That's right, you read that right, the British used anti-mine tools to kill the submarine!)

However, this time, the British wanted to dismantle the fixed anti-submarine network. At this time, several British Navy ships were preparing to dismantle part of the anti-submarine network outside Dunkirk Harbor.

"William, be careful, pay attention to the signal indicator light on the top of the anti-submarine network and the hollow tube under the indicator light. If this thing comes into contact with water, thick smoke will be emitted!" On a small boat, several British naval officers and soldiers are removing the signal indicator lights on the anti-submarine network one by one. This indicator light is called a lamp, but it is actually rather a smoke generator. The lamp body is spherical, and there is a hollow tube full of calcium phosphide under the lamp. When the submarine hits the anti-submarine network, it will tear off the floating body and cause sea water to pour in. Then the sea water and calcium phosphide react to produce thick smoke, and the float next to it will go out of the water surface to mark the location of the submarine.

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Chapter completed!