Guide German Submarine Warfare

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Britain was ill-prepared in for a resumption of unrestricted submarine warfare, and during the early months of World War II the U-boats, which at that time numbered only 57, again achieved great successes.

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The first phase, during which the U-boats generally operated singly, ended in March , by which time many merchant ships were sailing in convoy, trained escort groups were becoming available, and aircraft were proving their effectiveness as anti-U-boat weapons. In the next phase the Germans, having acquired air and U-boat bases in Norway and western France, were able to reach much farther out into the Atlantic , and their U-boats began to operate in groups called wolf packs by the British.

American Entry into World War I, 1917

One U-boat would shadow a convoy and summon others by radio, and then the group would attack, generally on the surface at night. These tactics succeeded until radar came to the aid of the escorts and until convoys could be given continuous sea and air escort all the way across the Atlantic in both directions. After the U-boats lost 41 of their number during that month, they withdrew temporarily from the Atlantic.

In the next phase, U-boats were sent to remote waters where unescorted targets could still be found. In the final phase the U-boats—then fitted with the snorkel schnorkel ventilating tube, which permitted extended underwater travel and greatly reduced the effectiveness of radar—returned to the coastal waters around the British Isles , but they sank few ships and themselves suffered heavy losses. In World War II Germany built 1, U-boats, of which were destroyed and the remainder surrendered or were scuttled to avoid surrender at the capitulation.

U-boat Campaign (World War I)

Of the U-boats sunk at sea, Allied surface ships and shore-based aircraft accounted for the great majority and respectively. Article Media. Info Print Print. This summer, North Carolina will remember the th anniversary of these historic attacks. Since World War I, nautical technology has evolved at a rapid rate, but in U-boats were considered quite advanced.

These vessels could reach maximum depths of 50 meters or feet, achieve speeds of 16 knots at the surface and eight knots underwater, and had a range of up to 25, miles. They were armed with deck-mounted guns and up to 16 self-propelled torpedoes.

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Since torpedoes of this period could be unreliable, surface attacks were quite common; this tactic also allowed U-boat crews to seize supplies and valuables from merchant ships before they sunk. Furthermore, some U-boats were equipped to transport and deploy naval mines.

Silent Service Boats Of World War II - Documentary

Submarine warfare played an integral role in the mounting international pressures of World War I. Germany built new and larger U-boats to punch holes in the British blockade, which was threatening to starve Germany out of the war.

10 Facts About Submarine Warfare in World War One | History Hit

In , Germany had just 20 U-boats. By , it had and the U-boats had destroyed about 30 percent of the world's merchant ships. At the dawn of , the German high command forced a return to the policy of unrestricted submarine warfare, engineering the dismissal of opponents of the policy that aimed to sink more than , tons of shipping a month.


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Germany was already experiencing food shortages and had imposed unpopular compulsory service either in armed forces or war industries.