In just a few days, more than 50,000 tons of American merchant ships were sunk, and these shipowners extended their influence to the US government, and the US Foreign Ministry came forward to protest to the German side, but the German side did not give in, any cargo ship that entered the British route 500 nautical miles can be regarded as providing support to the UK, and the submarine force will sink it as a whole, if the US side intends to export to Europe, it can choose to make a detour, or hand over to a neutral country, part of the merchant ships on the Nordic side, They would choose to ship their goods to other countries besides the Entente.

The United States did not expect that Germany would be so unyielding, and the transshipment they proposed by the countries of Northern Europe seemed to be a good method, but in fact, it could not be operated at all, and if it was to be transshipped, it would require American ships to unload in Northern Europe, with the transshipment level of this era, not to mention the price, the waste of time was a lot, which was tantamount to making it almost impossible for the United States to do shipping business on the European side, especially for the arms business, it was a devastating blow, if the United States did not give Britain, If France and Russia sell all kinds of resources and military supplies, what does the United States expect to make money?

They were not yet finally ready, and even if they were furious now, they could only endure it, and could not even fight back directly, and said a few dry words, as if to confirm that the German side had sunk the American ships, as if it was only used as a pretext for some future possibilities, which the German side did not discover, and the Foreign Ministry rejoiced that it had repelled the provocation of the Americans.

The United States is a behemoth, with industries far surpassing those of Germany, and is the first industrial country in the world. Although the United States, because of its isolationism, rarely participates in international disputes. But when the United States sent ships to deliver goods, they were sunk by German submarines. On the German side, there is tremendous pressure, and if the United States joins the Entente, even if it does not participate in the war, but only provides some logistical support, the British and French armies will be encouraged, and as for the direct participation of the United States in the war, this is a mobilization ability. A behemoth that will not be much worse than Russia, if it is really mobilized, it will definitely be above Russia, and the industrialized United States is far more terrible than Russia.

The United States endured it, which more or less disappointed Britain, who thought that it could drag the United States directly into the water, not to mention directly participating in the war. Just one accession can greatly boost the members of the Entente, but I didn't expect that the United States actually lost a large number of cargo ships. chose to endure it, which is more or less unusual. Henry and other British high-level officials know very well that the fist can only be withdrawn. If the United States keeps grasping this issue, it will be able to swing it out more forcefully. This is illustrated by the demand for reparations from Germany. The United States has no intention of making a move against Germany, and it is now at least 70 percent likely that the United States will do it against Germany after it has made complete preparations.

The United States may join the Entente after being ready, which is good news, but no matter how good the news is, it is only a long-term prospect, a conservative estimate, even if the United States now goes all out to complete industrial adjustment, military preparations, and even has the ability to send troops to the European continent, it will be at least nine months, and at most it may be about a year, according to the information that Britain knows so far, the latter is more likely.

In one year's time, whether it is on the European continent, Germany's pressure on Britain and France, or the current, the chains built by countless submarines, now it is much more difficult for Britain, facing the blockade of submarines, in a long period of time, the foreign supply of Britain itself, greatly reduced, this is a huge test for Britain, a careless, maybe the huge British Empire, will cease to exist.

In terms of supplies, there were not too many problems, and the early reserves and previous hoards of the British were enough to spend three or four months in the British Isles, provided that military control was carried out. The British Empire, finally because of the appearance of submarines, entered the military control, for a country, can deal with limited resources in more areas, every day to implement a fixed distribution system, everyone will become the British Empire industrial production hit the screw, this is probably the most difficult time since Britain became the world hegemon.

A small submarine, even only a few tenths of the capital ship, played a considerable role in a certain period of time, which was more or less, somewhat out of the expectations of the entire Western world, and Germany, after proving the great role played by submarines, began to continue to place orders to increase the purchase of submarines.

Among the many docks in the northwest, Qingdao shipyard and Shanghai shipyard are more engaged in the manufacture of ocean-going cargo ships and warships, but along the river, such as the Jiangyin shipyard, they can produce a large number of submarines as long as they build a part of the docks, and the German side, on the basis of the original, has purchased a large number of submarines, especially the northwest through the base of submarines. On the basis of the expansion of Qingdao shipyards in the northwest, the number of submarines is enough, and the many docks that were originally expanded did not know how to be good, but now, they have all been covered by Germany, more than 120 submarine orders, plus submarines produced by shipyards in Germany, when a production cycle is finally completed, the number of submarines in Germany will exceed 350, reaching a figure of nearly 400.

Even if the tonnage of a submarine is between 1,500 tons and 2,000 tons, more than 400 submarines, it is a huge number close to one million tons, even if it is a naval power Germany, to obtain seafarers who can get on board, it also needs to make greater efforts to train, now in the German Admiralty, there are at least 31 training submarines, although the largest is less than 400 tons, but it undertakes the training task of more than 22,000 submariners.

A battlefield where the smoke of gunpowder is invisible, has given great inspiration to the countries of the world, submarines, for the world's major military powers, the technical aspect is not a problem, many countries even do not pay attention to submarines, but they have also made the necessary technical reserves, just like those small submarines before Germany.

The emergence of weapons, sometimes just lies in the vision and development, like airships, submarines in the role of the submarine, immediately by Britain, France and the United States attention, but compared to the airship, the submarine is not a simple creation, compared with the capital ship, there has been a large deviation, battery pack, diesel engine unit, ultra-quiet propeller, fluid mechanics, even if it is the sound-absorbing tile of the outside world, these unique sub-projects, not at a glance can be seen intuitively, Britain is just according to its own understanding, plus a strong manufacturing level, Rapid follow-up, but in terms of the effectiveness of the submarine, it is much weaker.

Submarine warfare, to a certain extent, stimulated the field of world warfare, especially in the field of naval warfare, and for the improvement of anti-submarine warfare, in the field of the North Atlantic, the struggle between each other began to continue.

The submarine is underwater potential, because of the protection of the heavy ocean, before the submarine is found, any attack is futile, the huge ocean, enough to offset any attack, whether it is naval guns, bombs, or future nuclear weapons, when the explosion is over, the huge ocean, will gradually absorb and disperse the strength, when the smoke is gone, the ocean is still the same.

Discovery is the most important problem, the basic listener, has appeared in the UK, in the absence of the ocean back sound, can be heard, the sound of the submarine propeller, which is for most of the country's primary submarines, has a certain power, but the German submarine, is well-designed, at the beginning of the design, power is not the most critical problem, static is the key, in a certain depth, the sound of the propeller is only one-tenth of that of ordinary submarines, not to mention these primary listeners, even if it is a little more advanced, Unless background sounds and clutter can be filtered out, it is simply impossible to spot this submarine.

Rao is so, the microphone is still widely used in the British escort fleet, and even achieved certain results, and the opposite of the microphone, is the attack weapon, depth charges, as one of the most intuitive and powerful weapons against submarines, began to be equipped on a large number of escort fleets.

A destroyer of about 1500 tons - 2800 tons, the space on it is not the same, according to different levels, different effects of the destroyer, the number of depth charges that can be placed is not the same, although there is no direct evidence to prove that the number of depth charges, will directly affect the destroyer's hunting of submarines, but on the premise of roughly knowing the location, dense depth charges represent an increase in the success rate.

In the short period of one month of British convoy, around the hunt and counter-hunting, there was a non-stop competition, the waves and the cruiser destroyers, fighting to the death with each other, the waves achieved great results, but the British fleet also achieved a certain number of sunks, in just one month, a total of 11 submarines were sunk, most of which came from destroyers with a large number of depth charge launchers.

For this reason, the British not only built a large number of destroyers, but also carried out a series of modifications to the destroyers in view of the existing experience, so that he was more suitable for anti-submarine warfare, and put the most silent and low-level listening room to the lowest external sound, placed at the bottom of the entire ship, and on the entire ship design, and also maximized the satisfaction of the projection efficiency of depth charges.

The manufacturing cycle of small warships is relatively small, when the first one is finalized and the keel is laid in the shipyard, it is estimated that two or three months later, a new generation of anti-submarine ships will appear in the Atlantic, and at present, when the professional anti-submarine strength is not in place, Britain can only, crazy increase in the number of escort formation warships, to a certain extent, increase the cost of the escort formation, but also increase the consumption, Britain and Germany time, fell into a certain state of equilibrium, the war is such a unique situation, in submarine operations and anti-submarine operationsIt has gradually deepened, from the original war on the ground and at sea, to a deeper level. (To be continued......)