For escort anti-submarine warfare, the Nuland Navy and the Royal Bran Navy have long figured out the door.

The key, in fact, is to escort aircraft carriers.

In anti-submarine warfare with escort aircraft carriers as the core and main force, the pursuit is not to sink submarines, but to drive them away so that submarines cannot get close to the fleet.

Here, carrier-based patrol aircraft are relied on.

Normally, escort aircraft carriers will expand the antisubmarine search range to more than 300 kilometers during the day, and the patrol range in front of the route will even reach 500 kilometers, increase the density of patrols as much as possible, and focus on the sea area 60 degrees ahead of the route, so that nearby submarines will not dare to venture close during the day.

At night, even if the submarine pursues at full speed in the afloat state, it may not be able to catch up with the transport fleet.

Do not forget that the speed of the submarine is not too fast in the first place, and it is difficult to reduce the distance to the fleet at night.

What's more, before deciding to launch an attack, the submarine commander must definitely consider how to evacuate after the attack is successful, and generally set the attack time around the early morning, leaving 6 hours, at least 4 hours of retreat time, to ensure that he leaves the combat area before dawn.

There is no way to catch up with the fleet, so naturally there is no way to attack.

It is precisely for this reason that escort aircraft carriers have always been the mainstay of escort antisubmarine escorts.

Typically, each transport fleet has 2 to 4 escort carriers in it. The exact number is mainly determined by the size of the fleet. When there are less than 30 transport ships, only 2 escort aircraft carriers are generally needed, and if there are more than 50 ships, at least 4 must be arranged.

It is not that the larger the size of the fleet, the more likely it is to be ambushed by submarines, and the anti-submarine search must be strengthened.

In the first half of the year, the escort aircraft carriers were put into service in large quantities, which has effectively contained the Riman submarines.

In particular, in the second quarter, the probability of an attack on the fleet was reduced by 60 percent, losses were reduced by 7 percent, and more than 20 Riman submarines were sunk.

Unfortunately, the good times were short-lived.

It's not that the submarine has become more powerful, or that it has found a tactic to deal with the escort carriers, but the Nuland Navy sent a large number of escort aircraft carriers to the southwest and east.

If anything, this is related to the naval battle of the Southwest Fanyan Ocean.

At that time, including Lofus, the Nuland high-level was extremely disappointed in the Bran Kingdom, and even if they did not tear their faces, they no longer regarded the Bran Kingdom as an indispensable ally.

If anything, at the end of the naval battle, the Nuland authorities actually abandoned the kingdom of Bran, thinking that it was almost the same whether they had this ally or not.

Against this background, the Nuland Navy has increased its investment in the southwestern and southwestern Guia direction.

According to the situation at that time, as long as the Liang Xia Empire could be induced or forced to march into the Southwest and Eastern Strait and attack Austria, even if the Bran Kingdom had been defeated and surrendered, the Nuland Federation would be able to hold on, at least after the war situation stabilized, through a continuous war of attrition to force the Entente group to sit down and negotiate.

If I want to say, this is also the best result that can be obtained after the naval battle of the Southwest Fanyan Ocean.

For this reason, two-thirds of the escort aircraft carriers that were originally carrying out escort missions in the North Fanyan Ocean were sent to the southwest and the east.

These escort carriers are not only responsible for covering the transport fleet bound for Austria, but also act as aircraft transport ships to transport combat aircraft to the island bases in the southwestern and eastern seas.

It was by relying on these escort carriers that the Nuland Navy was able to rapidly strengthen its defense deployment in the southwestern and southeastern seas.

Of course, it is also related to the Liangxia Navy's battle to break diplomatic relations.

As mentioned earlier, the submarine force of the Liangxia Navy has been developed, and it mainly carries out the task of breaking diplomatic relations in the southwest and eastern seas.

To date, hundreds of Liangxia submarines have been operating in the direction of the southwestern and eastern seas.

Of course, only one-third, perhaps one-quarter, of them are in a state of combat readiness patrol, and the actual number of submarines deployed is about 30.

Even so, it is a threat that cannot be underestimated.

Although thanks to the island bases near the route, as well as the long-range patrol aircraft deployed at the island bases, and the fact that fast transport ships are the mainstay, the losses in the southwestern and eastward seas are not too great, but the large number of Liangxia submarines still exerts tremendous pressure on the anti-submarine escort.

Of course, the only way for the Nuland Navy is to increase anti-submarine investment.

In the northeast and east of the ocean, as well as on the west side of the Wangxi Canal, there is also a submarine threat, and it is necessary to arrange warships to provide escort cover for the fleet.

Among them, near the route from the west coast of the Nuland mainland to Jumbo Harbor, there are several Liangxia submarines at any time.

Although these submarines are mainly forgetful ships, they will never be merciful when it comes to lone transport ships.

Not to mention ships, even ships will be murdered.

Just last month, a light cruiser damaged in the battle on the transit island was attacked by the Liangxia submarine and sunk by a torpedo on the way back to the west coast of the mainland.

After the Liangxia Navy attacked the transit island, the number of Liangxia submarines operating in the northeastern and eastern guiata increased significantly.

Obviously, even if long-range patrol aircraft deployed at both ends of the route, i.e., the west coast of the mainland and the Khowaii Islands, can provide some cover for the fleet, it does not mean that warships can not be escorted, after all, it is difficult for patrol aircraft to deal with submarines that are quietly approaching the fleet at night.

The key is that in the Northeast and Guia Ocean, there is also a broken cruiser.

Even after increasing investment, the losses have not decreased.

In the past six months, the Nuland Federation has lost nearly 500 freighters in the Guia, most of which were built in large quantities after the outbreak of the war.

Although the loss per unit is much less than that of the sunset, the route over the Guia Ocean is longer, and the absolute value of the loss exceeds that of the North Sunset.

The Nuland Navy's shift of focus to the Guia Ocean was not entirely arbitrary, but a choice of last resort.

In Nitze's words, if the Nuland Navy does not increase its investment in the Guia Ocean, I am afraid that by the middle of the year, the Nuland Navy will have lost control of the Southwestern Guina.

If there were no timely delivery of weapons, equipment and combat materials, especially engineering materials, it would certainly not be possible to build so many fortifications on the transit island, and it would not be able to withstand the attack of Liang Xia's army. After the loss of the transit island, it was inevitable that Jumbo Harbor would be attacked.

Under the premise of focusing on the Guia Ocean, it is impossible to reduce the anti-submarine investment in the Guia Ocean under any circumstances.

It is not possible to talk about strengthening the anti-submarine forces in the North Sunset Ocean.

In addition, the performance of the Royal Navy of Bran is really eye-catching.

Also after the Battle of the Southwest Fanyan Ocean, the intensity of the activities of the Royal Navy's home fleet was greatly reduced, and the blockade and control of the North Sea became an ornament.

Otherwise, it would be impossible for those submarine support ships disguised as ships of other countries to swagger into the North Sunset Ocean in broad daylight.

The reason given by the Royal Navy was that it was not possible to provide air cover for ships going out to sea.

It's a reason, but it's very far-fetched.

At least in the waters close to Bran proper, if shore-based aviation could provide cover for the fleet, it would be possible to block several major waterways.

In a sense, the submarine was slaughtering in the North Sunset, and the Royal Navy of Bran had to bear the main responsibility.

If anything, it has to do with the conflict of interest within the alliance for a few days.

As a direct result of this, the construction of two types of transport vessels, nicknamed "Liberty Wheel" and "Victory Wheel", had to be accelerated.

Offset shipping losses by expanding the amount of construction!