Details of German Far East Submarine Fleet in World War II
This decision gives the anti-submarine fleet commanded by Admiral ingersoll, commander-in-chief of the Atlantic Fleet of the US Navy, a good opportunity to show its talents. The anti-submarine fleet with escort carriers such as Borg, Kaide, Cole and Santi as the core fully demonstrated the power of aircraft carriers and carrier-based aircraft and dealt a heavy blow to German submarines.
In June, in the North Atlantic, no fleet was attacked.
On June 3rd, "Borg" made its first record. While escorting the GUS-7A fleet, it sank the U-2 17 submarine and the U- 1 18 supply submarine in one fell swoop.
On June 9th, in order to continue submarine warfare and contain the allied escort forces, Deng Nici selected nine combat submarines and two supply submarines to form a fleet and set sail for the Indian Ocean where the allied escort forces were weak. By the end of the year, these submarines fought side by side with Japanese submarines in the Arabian Sea and the Indian Ocean, sinking 57 transport ships, totaling 337,000 tons, which became another bright spot after German submarines withdrew from the Atlantic Ocean, but the maritime transportation in the Indian Ocean was relative to the Atlantic Ocean.
In July, German submarines began to be equipped with acoustic homing torpedoes codenamed "Cormorant", which is the killer weapon of German submarines and can automatically track the sound of ship engines to attack. Unfortunately, due to low production, only four submarines can be equipped for each attack. The Germans specially used it to attack the escort warships in the allied fleet, and then used the gap caused by the sinking and injury of the escort warships in the fleet warning circle to attack the transport ship with ordinary torpedoes. American carrier aircraft also began to use the new "Fide" acoustic homing torpedo, which created an impressive record when it was put into actual combat for the first time, sinking four submarines in one fell swoop!
July was the worst month for German submarines. Not only in the submarine war in the Bay of Biscay, but also in the waters near the Azores in the middle of the Atlantic Ocean, American carrier aircraft sank seven submarines in a row. By August, the US anti-submarine fleet had sunk 15 submarines, eight of which were "Niu" class supply submarines. The significance of sinking 1 replenishment submarine is much greater than sinking 1 combat submarine, because 1 replenishment submarine can prolong the combat time of combat submarine, which is more important for the middle of the Atlantic Ocean far from the base, so it is very important. In the middle of the Atlantic Ocean, the ace warship that created great honor was the American escort carrier Kaide, and its carrier-based aircraft brigade sank four submarines, including two supply submarines.
At the same time, in July of 1943, the increasing shipbuilding capacity of the United States has made the tonnage of new ships built by the allies exceed that of sunk ships, and the wishful thinking of Deng Nici's tonnage war has been shattered.
From June to August, German submarines sank 58 allied transport ships, half of which were obtained in the Cape of Good Hope in southern Africa and the Indian Ocean. The Germans lost 79 submarines, 58 of which were sunk by planes, accounting for 73.4%.
Since August, German submarines have been equipped with Hagnuk radar receiver, acoustic homing torpedo, bubble bait generator and anti-aircraft gun. Among them, Deng Nici has also stepped up the construction of new submarines, and adopted the method of building the hull in sections to improve the speed of submarine construction. In addition, he also studied and analyzed the war situation and submarine tactics, and decided to continue to wage war on the allied maritime transport lines in order to contain a large number of allied troops and weapons, and keep abreast of the changes in allied anti-submarine equipment and tactical means. His hope of turning the submarine war into victory is pinned on the construction and practical use of new submarines.
With the implementation of these measures, Deng Nici felt confident to return to the Atlantic Ocean, and gradually relaxed the ban on entering the Atlantic Ocean at the end of August.
At the beginning of September, two batches of submarines of each 13 set sail from the bases in Germany, France and Norway, among which the submarine from the Bay of Biscay has been snorkeling off the coast of Spain to avoid the allied attacks.
16 September, the "Raton" boat group composed of 16 submarines was launched in the North Atlantic, ready to go into battle.
On September 18, the ONS- 18 fleet and ON-202 fleet from Britain to the United States approached the sea area where the "Raton" fleet was located. The British Admiralty had already noticed this, so it ordered the two fleets to change their routes slightly to the northwest in an attempt to avoid the interception of German submarines.
On September 19, Deng Nici ordered the submarine to re-enter the Atlantic Ocean. The Allied Liberator anti-submarine aircraft that took off from Iceland that day provided reliable protection for the ONS- 18 fleet and sank the U-34 1 submarine. After nightfall, two submarines attacked the fleet. 1 The British destroyer suffered heavy losses due to the premature explosion of the "Hedgehog Bomb" launched. At the same time, the Canadian navy sent two destroyers and four frigates to strengthen the escort of the fleet.
On September 20, German submarines discovered the ON-202 fleet, and U-270 immediately attacked it, injuring the frigate Lagan with acoustic homing torpedoes. U-238 took the opportunity to break through the warning circle of the fleet and sank two transport ships in succession. The U-338 submarine was about to launch an attack, but it was discovered by the Liberator, who was in charge of air cover, and immediately launched a "Fide" homing torpedo to sink it. That night, the ONS- 18 fleet joined the ON-202 fleet, but the anti-submarine planes left one after another because of fuel exhaustion, giving the German submarine the opportunity to sink two escort warships with acoustic homing torpedoes.
On September 22, sunny weather was a favorable condition for the anti-submarine aircraft patrolling in the air to show their talents. The Liberator found and severely damaged two German submarines, and the carrier aircraft "Macalpin", the escort carrier accompanying the ON- 18 fleet, also took off from time to time to provide air cover for the fleet. Although it did not reach the record of sinking and injuring the submarine, it forced the submarine to dive many times and could not carry out the attack. However, German submarines still follow the fleet like ghosts and keep in touch with the fleet in an attempt to find fighter planes to attack.
In the early morning of September 23, several submarines finally broke through the warning circle of the fleet and sank the/KLOC-0 frigate and four transport ships successively. After dawn, the allied forces strengthened air cover, and the shore-based anti-submarine aircraft cooperated closely with the escort carrier aircraft, effectively suppressing the German submarines, and finally forcing all submarines to dive for a long time, thus making the fleet completely free from the submarine's tracking.
The battle of breaking off diplomatic relations was the first battle after the German submarine returned to the Atlantic Ocean. The Allies lost six transport ships (36,000 tons) and three escort warships. The lost transport ship of the Allied Forces was sunk without air cover at night, and the lost escort warships were sunk by German new weapons and acoustic homing torpedoes. Three German submarines were sunk and three were injured.
In view of the acoustic homing torpedo of the German submarine, the Allies quickly took measures and urgently equipped the "Fox" noise generator. This device is towed behind the ship with a rope, which can make a loud noise, attract the acoustic homing torpedo and protect the warship from loss.
Deng Nici's confidence doubled because of the exaggeration of German submarines in reporting the results in September, especially he placed great hopes on acoustic homing torpedoes. After entering 10, he once again mobilized submarines in the North Atlantic, ready to rely on acoustic homing torpedoes to regain the initiative to break the game.
1in the autumn of 943, the huge shipbuilding capacity of the United States gradually began to appear. The standard 10,000-ton carrier was honored as "Freedom Wheel" and "Victory Wheel", and mass production began. In particular, Caesars Shipyard adopted prefabricated production line technology for assembly line production. In the assembly workshop of the shipyard, thousands of riveters work in shifts day and night to rivet the prefabricated hull parts together. With the miraculous efforts of "talented American shipbuilders", the construction speed of this 10,000-ton ship was gradually shortened from six months at the beginning of the year to less than three months in May, and then to four weeks in September, until "Robert? Peary's 10,000-ton ship was launched in only four days and fifteen hours, and even the paint on the hull was not dried when it was launched, which created the myth of shipbuilding industry! This shipbuilding record has not been broken until today! In this way, Deng Nici's attempt to decide the victory of the war by sinking a transport ship with a larger tonnage than the newly-built transport ship of the Allies finally came to nothing.
At the beginning of 65438+ 10, two allied escort fleets changed their routes one after another to avoid the patrol line of submarines. The Third Fleet had strong air cover. German submarines not only failed, but lost U-279 and U-389 submarines. The fourth fleet is SC- 143, with 30 transport ships, which are escorted by 10 warships, including 1 escort carrier, and there are four destroyers nearby to provide support at any time.
On October 6th, 65438/KLOC-0, the German long-range reconnaissance plane discovered this fleet, and Deng Nici immediately ordered the "Rosbach" fleet active in the North Atlantic to intercept it.
654381October 7, U-448 submarine found the fleet. Eight submarines arrived that night and kept in touch with the fleet, but they were effectively suppressed by the escort warships and failed to break through the warning circle of the fleet.
654381In the early morning of October 8, the U-378 submarine sank the Polish destroyer Okan with an acoustic homing torpedo. After dawn, the escort carrier Lapner, which was sailing with the fleet, and the anti-submarine Swordfish, which took off, and the anti-submarine Liberator, which took off from Iceland, cooperated and sank two submarines, injuring 1 submarine, completely crushing the German submarine's attempt to attack the fleet. In the afternoon, the Germans sent BV-222 seaplanes to guide the submarine attack, but they still found nothing. At dusk, the "Sunderland" shore-based anti-submarine sank the U-6 10 submarine again. After nightfall, the Allies first dispatched the Liberator anti-submarine aircraft equipped with searchlights at night to provide air cover for the fleet crossing the Atlantic Ocean, effectively protecting the fleet at night. Unfortunately, due to the limitation of endurance, it had to return before dawn. German U-645 submarine took advantage of the short interruption of air cover before dawn to attack and sink the 1 transport ship. Then the German submarine stopped attacking.
In this battle, the Germans sank/kloc-0 destroyers and transport ships, but paid a huge price for sinking three submarines and injuring/kloc-0 ships.
10 year 10 8 October, Portugal agreed to use two airports in Azores by its allies. 65438+1October 19 The first batch of shore-based long-range anti-submarine aircraft arrived in transit, and the mid-Atlantic with the weakest air escort force began to get full air cover. Since then, the air cover of allied shore-based aviation has spread all over the Atlantic, so the air cover of the North Atlantic has been further consolidated and improved.
101October15th, the U-844 submarine of the German "schlieffen" boat group discovered the ON-206 escort fleet, which was made up of 65 transport ships, escorted by 2 destroyers and 2 frigates, and supported by 2 destroyers and 3 frigates when necessary.
10 10 16, the U-964 submarine found the ONS-20 escort fleet near the ON-206 fleet, which consisted of 52 transport ships and was protected by five destroyers.
In order to concentrate the largest forces to carry out cluster attacks on the two fleets, Deng Nici ordered all submarines nearby to approach the fleet quickly and decisively. In order to join the battle quickly, Deng Nici specially instructed that if they encounter an airplane, they must sail to the battlefield on the water and fight with anti-aircraft guns on the deck. As a result, when submarines approached the fleet, several submarines fought fiercely with allied anti-submarine aircraft, three submarines were sunk, the allied forces were shot down, and 1 Liberator's plane was injured. Only the U-426 submarine arrived in the waters where the ONS-20 fleet was located around the evening, attacked and sank the 1 transport ship. In view of the huge threat faced by the ONS-20 fleet, two destroyers and three frigates of the B7 escort brigade, which originally provided support for the ON-206 fleet, were ordered to support the ONS-20 fleet. On the way to the ONS-20 fleet, these escort warships found and sank the German submarine U-63 1. Six German submarines near the ONS-20 fleet were driven away by escort warships that night and lost contact with the fleet, so the fleet did not suffer losses at night.
On June 10 and 17, the U-309 submarine found the ONS-20 fleet again. According to the report of U-309, Deng Nici ordered the remaining 12 submarines of schlieffen to continue attacking the fleet. However, under the strong air cover of the allied forces, nine submarines were attacked by anti-submarine aircraft and sunk by 65438. Soon, the escort warships adopted a new tactic invented by the British Navy Colonel Wicca, that is, the two ships cooperated to attack and the two ships lined up. The second one uses sonar to determine the accurate position and speed of the submarine, and then guides the first one to the vertical top of the submarine to carry out a deep bomb attack. This tactic can avoid the blind area of sonar detection when a single ship attacks a submarine, thus greatly improving the accuracy of deep bomb attack. -The new tactics really worked in one fell swoop, sinking the U-84 1 submarine. The Germans stopped attacking.
In this battle, the Germans attacked two escort fleets, only 1 transport ship was sunk, but six submarines were sunk.
Due to the promotion of new anti-submarine tactics of escort warships, the number of German submarines sunk and injured by surface ships has greatly increased. At least 25 submarines were sunk by surface ships in September and June of 5438+1October.
/KOOC-0/0/KOOC-0/The Siegfried fleet consisting of 24 submarines deployed in the North Atlantic (later increased to 3/KOOC-0/) attacked the transatlantic allies successively, including HX-262, ON-207, SC-/KOOC-0/45. However, with the continuous enhancement of allied air cover forces and the gradual close cooperation between surface ships and aircraft, German submarines not only failed to achieve great results, but also sank two transport ships and two warships and shot down two anti-submarine aircraft, but suffered heavy losses. Nine submarines were sunk successively. These undoubtedly show that the "wolf war" of German submarines has come to an end.
In late June of 65438+10, the German "Hill" fleet consisting of eight submarines deployed on the Gibraltar route received the fleet information discovered by the German FW-200 reconnaissance plane, which was a huge fleet merged by two escort fleets and bound for Britain. * * * owns 60 transport ships, which are covered by 7 escort warships. The speedboat "Hill" quickly went to intercept. On 3 1, the U-262 submarine sank 1 transport ship, but the U-306 submarine was sunk and U-44 1 was injured. From the density and intensity of the allied air cover, Deng Nici accurately judged that the allied forces had begun to use the Azores airport, so that the allied fleet would get strong air cover, and Deng Nici had to order to stop the attack.
During the period of 65438+ 10, two German supply submarines, U-422 and U-220, were sunk by the American escort carriers "Kade" and "Schlock Island" respectively, so that only one German supply submarine, U-488, was left, which provided sea supplies for combat submarines cruising in the vast sea. Deng Nici didn't want to lose this precious supply submarine again, and deliberately moved it from more dangerous waters to safer coastal waters in Africa.
10 in September and June, only 9 of the 2,468 transport ships of 64 allied escort fleets crossed the Atlantic were lost.
In late June of 10, Deng Nici was forced to completely abandon group operations and switch to single-boat operations. At this time, what Deng Nici should consider is no longer how to sink the allied transport, but the survival of the submarine. At this time, the number of powerful shore-based aviation and anti-submarine aircraft of the allied forces has reached more than 3,000, and each German submarine has to fight against 20 or 30 on average. Moreover, shore-based aviation has established a perfect base network in Iceland, Ireland, Newfoundland, Bermuda, Greenland and Azores. With the carrier-based aircraft escort carrier, air cover covers almost the entire Atlantic route, plus the offensive anti-submarine task force consisting of carrier-based aircraft and escort carrier surface ships, and the Bay of Biscay.
In the two months of 165438+ 10 and 65438+February, German submarines sank only 13 transport ships, accounting for 7 10000 tons, while the number of submarines lost was as high as 16. This record is far from 1943 in March!
1943 is a crucial turning point in the Atlantic anti-submarine warfare. From the brilliant victory of German submarines at the beginning of the year to the sunset of German submarines at the end of the year, the darkest and difficult period before dawn has passed for the allies, and the dawn of victory has come! In the whole year, the Allied Forces lost 466 transport ships, about 2.203 million tons, less than half of 1942! The Germans lost 237 submarines. Moreover, the Germans were forced to abandon the submarine cluster attack tactics, which enabled the Allies to safely transport a large number of personnel, equipment and materials across the Atlantic to Britain from the second half of the year. These personnel, equipment and materials laid a solid material foundation for the allied forces to implement the Normandy landing that opened the second front in June 1944. If the safety of the transatlantic transport fleet cannot be guaranteed, the preparations for the Normandy campaign will not be completed in time, and if the Normandy campaign is postponed, Germany will take this breathing space to strengthen its defense preparations, so the outcome of the landing campaign that determines the fate of the war will be unpredictable. It can be said that the outcome of the Atlantic route escort war is decisive to the outcome of the war.
1944, the battle of German submarines became more and more difficult.
In the middle of 65438 10, Deng Nici deployed more than 20 submarines in the vast waters of Brost, starting from Feros Islands in the west of Scotland in the north and reaching the western end of French Brittany Peninsula in the south, forming patrol lines every 50 kilometers. However, due to the great threat of the allied anti-submarine aircraft, these submarines can only sneak for a long time and find that the task of the fleet can only be handed over to the air force reconnaissance plane. Unfortunately, air force pilots lack special training in sea and air search and tracking and monitoring, and have found the fleet several times, but they can't effectively monitor it, so the attack efficiency of submarines is greatly reduced.
654381October 26th and 27th, German Junk -290 reconnaissance plane found OS-66 and KMS-40 fleets many times in the North Atlantic, and Deng Nici concentrated 20 submarines to prepare for a big fight.
On June 28th, 65438 10, the Allied Forces learned that German submarines were assembled. In order to ensure the safety of the fleet, they ordered the 19th Battalion of Haiphong Aviation, with the cooperation of the 89th Battalion, to conduct a large-scale anti-submarine warfare in the waters near the routes of the two fleets. Anti-submarine aircraft attacked several submarines and sank two submarines, U-27 1 and U-57 1.
In view of the powerful air cover power of the allied forces, Deng Nici was forced to stop attacking the fleet on June 29, 65438/KLOC-0, and recall these submarines to France in order to enter new battles nearby.
At the end of 65438+ 10, the Allies sent the British Second Support Brigade consisting of two escort carriers and five frigates to support the Allied fleet sailing in the waters west of Ireland.
65438+1October 3 1 day, the brigade sank the U-592 submarine in the waters west of Ireland.
On February 3, the Germans assembled 28 submarines in the waters west of Ireland.
On February 6th, German Yongke -290 reconnaissance plane found the combined fleet of SL-1 47 and MKS-38, which was escorted by 1 destroyer, seven frigates and1armed anti-submarine trawler.
On February 8, 1 frigate discovered the U-762 submarine, and then carried out a coordinated attack with two other frigates, sinking it in one fell swoop.
On February 9, German submarines U-238 and U-734 were found and sunk by escort warships when approaching the fleet.
On February 10, the On-223 convoy covered by the British Coastal Defence Air Force Brigade 15 encountered a German submarine. German submarines U-283 and U-545 used anti-aircraft guns against British aircraft. Although two Wellington anti-submarine planes were shot down, they were both sunk by British planes and surface ships.
On February/KOOC-0/2, seven bombers and three submarines from henkel-/KOOC-0/77 attacked the fleets of OS-67 and KMS-4/KOOC-0/. The "tracker" carrier aircraft that escorted the fleet went all out to fight, shot down two German planes and repelled German submarines, leaving the fleet with no loss.
On February 13, in order to avoid the loss of submarines, Deng Nici ordered to move to the waters further west.
From February/KOOC-0/4 to February/KOOC-0/6, the German reconnaissance plane found the allied fleet sailing in the North Sea. Under the strong cover of shore-based aviation, each fleet safely passed the submarine patrol line composed of German boat code-named "Hedgehog".
On February 17, 2007, in order to ensure the safety of the fleet, the Allies dispatched the second and tenth support brigades and the B7 escort brigade to strengthen the escort force of the fleet sailing in the North Sea. At dusk that day, according to the report of the reconnaissance plane, Deng Nici organized 2 1 submarines in the nearby waters into a fleet code-named "Shark", ready to attack. However, the allied forces detected the activities of German submarines through radio interception and decoding, and immediately informed the fleet to change course to avoid the new patrol line of German submarines. However, the German radio interception also found the evasive action of the fleet, and dispatched a 10 reconnaissance plane to conduct a large-scale air search. Among them, 1 was shot down by allied fighters, but three eventually found the fleet.
On February 18, the German submarine arrived at full speed after receiving the report from the reconnaissance plane and readjusted the patrol line. That night, the fleet broke into the submarine patrol line, and the escort warships fought fiercely with the German submarines. Three submarines fired acoustic homing torpedoes at the escort warships, only 1 frigate was injured and sank on the way back to the base. Allied escort warships sank three submarines, of which U-264 was the first German submarine equipped with snorkel.
It is actually a transitional measure to equip submarines with snorkels. Deng Nici is making every effort to organize the construction of the Z 1 submarine code-named "Walter". The displacement of this submarine is 1600 tons. It adopts a new engine invented by Professor Walter and a streamlined hull, which makes the underwater speed reach a record 14 knots, and the battery energy is more than double that of the existing submarine, so it can sail underwater for a long time. Therefore, it is easy to catch up with the fleet from underwater, attack in front of the fleet route, and get rid of the attacks of escort warships and planes by virtue of excellent underwater mute performance. Although the development and production of this new submarine began in the second half of 1943, the construction of the new submarine was greatly hindered by the fierce bombing of the development unit and submarine construction factory by allied strategic aviation, and mass production could not be realized until at least 1945. In order to carry out submarine warfare effectively before the new submarine came into service, Deng Nici had to adopt a compromise plan and install a snorkel for the submarine. The so-called snorkel is actually an intake pipe, through which the submarine can still replenish fresh air when diving, so that the diesel engine of the submarine can still work normally even when diving, completely changing the situation that the submarine can only rely on the motor to provide power when diving. Because the battery consumes energy quickly when using the motor, and the battery must be powered by the diesel engine, the submarine is bound to float out of the sea to charge. After using the snorkel, the time of floating and charging can be greatly reduced, so that it can dive as much as possible and avoid the attack of allied aircraft. In this way, the submarine's loss is reduced, but due to long-term underwater navigation, it is difficult for the submarine to find the fleet, let alone sink the transport ship. In order to solve this problem, Deng Nici met with Hitler on February 26th, demanding to increase the number of reconnaissance planes and step up the production of Z 1 submarines.
Deng Nici also ordered the submarine to move to the deep-sea area, which is 0/300 km away from the coast, and adopted the dispersed attack tactics to carry out the battle.
In late February, Deng Nici readjusted its submarines operating in the North Atlantic, and deployed a fleet codenamed "Prosen" consisting of 16 submarines in western Ireland, three submarines in southern Ireland, 1 submarines in the waters near Iceland, and three submarines to forecast the weather in the Atlantic.
On February 24th, SC- 135 Fleet escorted warships to sink the returning U-257 submarine.
On February 25th, six destroyers of the Allied First Support Brigade, which were active in the waters west of Ireland, actively carried out submarine search and anti-submarine operations, and fought against German submarines in the waters, successively sinking U-9 1 and U-358 submarines, while U-358 sank 1 destroyer with acoustic homing torpedo before sinking.
On March 1, the US anti-submarine task force with Brock Island as the core sank two submarines in the waters north of Azores.
On March 2nd, the German submarine U-744 sank the Allied 1 tank landing ship west of the Bay of Biscay. But it was later sunk by allied surface ships.
At the beginning of March, Prosen's fleet in the sea west of Ireland increased to 24 submarines. On March 9, it attacked two fleets continuously, sinking 65,438 destroyers and 65,438 frigates.
On March 10, the U-845 submarine was discovered and sunk by the escort warship as soon as it reported the discovery of the escort fleet. Several submarines rushed to attack at the news. U-74 1 was attacked by the Canadian Air Force "Sunderland" anti-submarine aircraft for 30 hours. The high morale that the German submarine force used to be proud of is gone forever, and the crew of U-74 1 gave up the submarine to escape. Two other German submarines cooperated closely to resist the attack of allied planes and shot down 1 allied "Wellington" plane.
12 In March, shore-based aviation effectively covered the fleet sailing in the Atlantic Ocean, and U-3 1 1 British anti-submarine aircraft were shot down, but the U-575 submarine was attacked by the British anti-submarine aircraft Wellington and the American anti-submarine task force with the escort carrier Borg as the core.
On March 14, the frigate of the Allied Second Support Brigade sank the U-653 submarine with the cooperation of the escort carrier aircraft "Wendex".
17 in March, the allied Cu- 17 fleet was attacked by German submarines. The escort warship injured 1 submarine, but the 1 tanker in the fleet was sunk by a German submarine.
From then on, Deng Nici realized that if he continued to carry out cluster attacks in the Atlantic, he would only suffer greater losses. On March 22, he ordered the dissolution of the "Prosen" boat group and carried out single-boat hunting.
In the first three months of 1944, only three of the 3360 transport ships of 105 crossed the Atlantic were sunk by submarines, and the Germans paid heavy losses for the sinking of 36 submarines. Deng Nici therefore ordered the cancellation of the attack on the transatlantic fleet.
In April, because the allied forces created conditions for the upcoming Normandy landing and carried out large-scale strategic deception and feint, the German high command was confused by this series of strategic deception and feint of the allied forces and ordered the submarine forces to invest in anti-landing. Therefore, Deng Nici sent a fleet of 40 submarines along the French coast of the English Channel in an attempt to stop the allied forces from landing.
Although in mid-April, German submarines concentrated on anti-landing and failed to participate in the war of breaking off diplomatic relations, they sank six submarines, two of which were sunk by the third brigade composed of the American escort carrier Gwadar Kanal and five destroyers.
At the beginning of May, only five German submarines were active in the Atlantic Ocean, and two of them were sunk soon.
From May 16 to May 3 1 8, the British Coastal Defence Air Force Battalion 18 launched an aerial anti-submarine war against German submarines entering the Atlantic Ocean from Norway. The British army invested in various types of anti-submarine aircraft such as "Catalli Mna", "Sunderland" and "Liberator", and successively found 22 German submarines, attacked 13 times, sank 4 submarines, and forced 2 submarines to turn back to the starting base.
In addition, U-476 shot down 1 Sunderland aircraft in the confrontation with British aircraft, but the submarine was also seriously damaged, and was finally sunk by U-990 submarine due to serious injuries. The U-990 submarine was quickly sunk by allied planes near Trondheim.
In the air anti-submarine warfare of the 18 brigade, only eight German submarines entered the Atlantic Ocean.
At the end of May, the Germans only deployed two submarines on the coast of the United States and two on the coast of Africa. The number of submarines has been reduced to a minimum, only fighting for survival, and there is no record at all. Deng Nici has deployed three submarines in the Atlantic Ocean, all of which are only responsible for reporting the weather forecast. About 70 submarines assembled in the port of Biscay to prepare for the allied landing in France.
On May 29th, the first brigade of the 22nd anti-submarine fleet, consisting of the escort carrier Brock Island and five destroyers, met the German submarine U-549. U-549 first attacked the aircraft carrier Brock Island, which was hit by three torpedoes and quickly capsized and sank. The destroyer/kloc-0 was also injured by the acoustic homing torpedo launched by the submarine. But then the U-549 submarine was sunk by two other destroyers.
Due to the sinking of the aircraft carrier Brock Island, the first brigade was ordered to return, and its original anti-submarine mission was replaced by the third brigade consisting of the escort aircraft carrier Gwadar Kanal and five destroyers.
/kloc-in June, 2000, Deng Nici ordered that submarines without snorkels should not enter the Atlantic Ocean to reduce more and more submarine losses.
On June 3rd, the 1st Battalion 18 of the British Coastal Defence Air Force launched the first air strike against German submarines in Norwegian waters in order to prevent German submarines from entering the English Channel from Norwegian waters as much as possible. The participating troops are the 86th Squadron of the British Air Force, the 206th Squadron of the Canadian Air Force, the 2nd10 Squadron, the 333rd Squadron and the162nd Squadron, and the models are Catalim Na, Liberator and beaufighter.
On June 4, the destroyer sonar of the third brigade discovered the German submarine U-505. Colonel Gallery, commander of the third brigade, immediately ordered two destroyers to go to support, while the aircraft carrier Gwadar Kanal turned west and two wildcat fighters took off in an emergency. "Wildcat" fighters rushed to the sea where the submarine was found, and soon they clearly saw the outline of the submarine in the water. The fighter plane immediately fired at the submarine to indicate the target for the destroyer. "Chatterling" rushed over and dropped 12 shallow and deep bombs in one breath. The water column soared into the sky and the sea churned violently. The submarine was seriously damaged by the violent explosion in front of it. Captain Langer had to order it to float, just after more than six minutes of deep bomb attack. The submarine surfaced about 640 meters away from the destroyer, making a rattling sound. The hatch of the submarine control tower and the bow was opened and the crew rushed out to escape. Before the order was issued, Twitter and two other destroyers that had just arrived opened fire, and the "wild cat" fighters in the air began to shoot, with intensive artillery fire.