The Use of U-boats in World War I
- Learn about the German Navy's attempt to use U-boats to challenge the Grand Fleet's superiority in World War I.
- Discover the failed attempts to lure the Grand Fleet into U-boat traps and the lack of U-boat involvement in the Battle of Jutland.
- Explore the decision to abandon this strategy and resume commerce warfare.
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In 1916 the German Navy again tried to use the U-boats to erode the Grand Fleet's numerical superiority; they staged operations to lure the Grand Fleet into a U-boat trap. Because the U-boats were much slower than the battle fleet, these operations required U-boat patrol lines to be set up in advance; then the battle fleet maneuvered to draw the Grand Fleet onto them. Several of these operations were staged, in March and April 1916, but with no success. Ironically, the major fleet action which did take place, the Battle of Jutland, in May 1916, saw no U-boat involvement at all; the fleets met and engaged largely by chance, and there were no U-boat patrols anywhere near the battle area. A further series of operations, in August and October 1916, were similarly unfruitful, and the strategy was abandoned in favor of resuming commerce warfare.
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以下のとおりお答えします。ドイツ海軍が、艦隊の数的劣勢を回復しようとして立てたＵボート作戦について述べています。 ＞In 1916 the German Navy again tried to use the U-boats to erode the Grand Fleet's numerical superiority; they staged operations to lure the Grand Fleet into a U-boat trap. Because the U-boats were much slower than the battle fleet, these operations required U-boat patrol lines to be set up in advance; then the battle fleet maneuvered to draw the Grand Fleet onto them. ⇒1916年、ドイツ海軍は大艦隊の数的優位を侵食するために、再びＵボートを使用しようとした。彼らは、Ｕボートの罠に大艦隊をおびき寄せるために、幾つかの作戦を演じた。Ｕボートは戦闘艦隊より速度がずっと遅かったので、これらの作戦にとっては、事前にＵボートの巡回線を設定することが必要であった。そこで戦闘艦隊は、自分ら（潜水艦）の頭上に大艦隊を引き寄せるための誘導を画策した。 ＞Several of these operations were staged, in March and April 1916, but with no success. Ironically, the major fleet action which did take place, the Battle of Jutland, in May 1916, saw no U-boat involvement at all; the fleets met and engaged largely by chance, and there were no U-boat patrols anywhere near the battle area. A further series of operations, in August and October 1916, were similarly unfruitful, and the strategy was abandoned in favor of resuming commerce warfare. ⇒1916年3月と4月に、これらの作戦の幾つかが演じられたが、まったく成功しなかった。皮肉にも、1916年5月に実際に行われたおもな艦隊作戦「ユトランド半島の戦い」は、Ｕボートの関与が全然見られなかった。主として艦隊が偶然出会って対戦になったのであり、その戦闘海域にはＵボートの巡回などは全然なかった。1916年8月と10月の、さらなる一連の作戦行動も同様に実を結ばず、その戦略は商業戦闘の再開を支持して、放棄されることとなった。
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In 1916 the German Navy returned to a strategy of using the U-boats to erode the Grand Fleet's numerical superiority by staging a series of operations designed to lure the Grand Fleet into a U-boat trap. Due to the U-boats' poor speed compared to the main battle fleet these operations required U-boat patrol lines to be set up, while the High Seas fleet manoeuvred to draw the Grand Fleet to them. Several of these operations were staged, in March and April 1916, but with no success. Ironically, the major fleet action which did take place, the Battle of Jutland, in May 1916, saw no U-boat involvement at all; the fleets met and engaged largely by chance, and there were no U-boat patrols anywhere near the battle area. A further series of operations, in August and October 1916, were similarly unfruitful, and the strategy was abandoned in favour of resuming commerce warfare.
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The U-boats scored a number of impressive successes, and were able to drive the Grand Fleet from its base in search of a safe anchorage, but the German Navy was unable to erode the Grand Fleet's advantage as hoped. Also, in the two main surface actions of this period the U-boat was unable to have any effect; the High Seas Fleet was unable to draw the Grand Fleet into a U-boat trap. Whilst warships were travelling at speed and on an erratic zigzag course they were relatively safe, and for the remainder of the war the U-boats were unable to mount a successful attack on a warship travelling in this manner
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In August 1914, a flotilla of ten U-boats sailed from their base in Heligoland to attack Royal Navy warships in the North Sea in the first submarine war patrol in history. Their aim was to sink capital ships of the British Grand Fleet, and so reduce the Grand Fleet's numerical superiority over the German High Seas Fleet. The first sortie was not a success. Only one attack was carried out, when SM U-15 fired a torpedo (which missed) at HMS Monarch. Two of the ten U-boats were lost.
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On 12 August, seven U-boats returned to Heligoland; U-13 was also missing, and it was thought she had been mined. While the operation was a failure, it caused the Royal Navy some uneasiness, disproving earlier estimates as to U-boats' radius of action and leaving the security of the Grand Fleet's unprotected anchorage at Scapa Flow open to question. On the other hand, the ease with which U-15 had been destroyed by Birmingham encouraged the false belief that submarines were no great danger to surface warships.
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Another option was arming ships for self-defence, which, according to the Germans, put them outside the protection of the cruiser rules. Another option was to arm and man decoy ships with hidden guns, the so-called Q-ship. A variant on the idea was to equip small vessels with a submarine escort. In 1915, three U-boats were sunk by Q-ships, and two more by submarines accompanying trawlers. In June also U-40 was sunk by HMS C24 while attacking Taranaki, and in July U-23 was sunk by C-27 attacking Princess Louise. Also in July U-36 was sunk by the Q-ship Prince Charles, and in August and September U-27 and U-41 were sunk by Baralong, the former in the notorious Baralong Incident. There were, however, no means to detect submerged U-boats, and attacks on them were limited to efforts to damage their periscopes with hammers and dropping guncotton bombs. Use of nets to ensnare U-boats was also examined, as was a destroyer, Starfish, fitted with a spar torpedo. In all, 16 U-boats were destroyed during this phase of the campaign, while they themselves sank 370 ships totalling 750,000 GRT.
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The U-boat campaign was not able to cut off supplies before the US entered the war in 1917 and in later 1918, the U-boat bases were abandoned in the face of the Allied advance. The tactical successes and failures of the Atlantic U-boat Campaign would later be used as a set of available tactics in WWII in a similar U-boat war against the British Empire.
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The British were well aware of the risk of U-boat traps to the Grand Fleet, although they had no means of knowing where these might lay. However Jellicoe had developed a tactical response to the problem (which, in the event, was never tested). Faced with a German fleet that turned away, he would assume a submarine trap, and decline to follow, but would move at high speed to the flank, before deploying or opening fire; the aim of this would be to fight the battle away from the ground chosen by his enemy, and forcing any U-boats present to surface if they intended to follow.
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Offensive measures were less effective; efforts were made to use nets to find submerged U-boats, and explosive sweeps to destroy them, but these were largely failures. Attempts were also made to close routes like the Straits of Dover with boom nets and minefields, the so-called Dover Barrage; to lay minefields around U-boat bases, and station submarines on patrol to catch them leaving or entering port. These measures required a huge expenditure of effort and material, but met with little success. Just 2 U-boats were sunk by these measures in 1915.
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Operation Hush was a British plan to make amphibious landings on the Belgian coast in 1917 during World War I, supported by an attack from Nieuport and the Yser bridgehead, which were a legacy of the Battle of the Yser (1914). Several plans were considered in 1915 and 1916, then shelved due to operations elsewhere. Operation Hush was intended to begin when the main offensive at Ypres had advanced to Roulers and Thourout, linked by advances by the French and Belgian armies in between. Operation Strandfest was a German spoiling attack, conducted on 10 July by Marinekorps-Flandern, in anticipation of an Allied coastal operation. The Germans used mustard gas for the first time, supported by a mass of heavy artillery, which captured part of the bridgehead over the Yser and annihilated two British battalions. After several postponements, Operation Hush was cancelled on 14 October 1917, as the advance during the Third Battle of Ypres did not meet the objectives required to begin the attack. In April 1918, the Dover Patrol raided Zeebrugge, to sink block ships in the canal entrance to trap U-Boats, which closed the canal for a short time. From September–October 1918, the Belgian coast was occupied by the Allies, in the Fifth Battle of Ypres.
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A less favorable impression was made by the cruise of U-53 under K/L Hans Rose. After refuelling at Newport, Rhode Island, Rose raided Allied shipping off the coast of Canada and the United States. Although this was in international waters, and Rose scrupulously followed international law, the action was seen as an affront to the US, particularly when US warships were forced to stand aside while merchant ships nearby were sunk. Arctic waters In autumn 1916, U-boats of the High Seas flotilla attacked shipping bound for Russia. Five U-boats operated in the Barents Sea between North Cape and the Kola inlet. Also, the two UE1-class minelaying boats laid minefields in the White Sea. These boats sank 34 ships (19 of them Norwegian) before winter ice closed the area for operations.
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