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3 Mart 2010 Çarşamba

Submarine Warfare – U-boat Era

Submarine Warfare – U-boat Era

Submarine Warfare – U-boat Era
When the war began, there were only twenty five submarines in the German navy. By February 1915, however a crash construction program has resulted in a flotilla of U-boats, each carried with nineteen torpedoes, large enough to proclaim the waters surrounding the British Isles a war zone.

The subs would sink all enemy merchant ships within those waters and because British vessels were likely to run up neutral flags, the safety of neutral ship could not be guaranteed.

Within days, several British vessels went to the bottom. President Wilson warned the Kaiser that he would hold Germany to “strict accountability” for American lives and property lost to U-boats.

Some Americans considered submarine warfare peculiarly inhuman because U-boats usually struck without warning giving merchant seaman little time to abandon ship.

Moreover, unlike surface ships submarine did not rescue crewmen in the water. Both accusation were true.

On the surface, the fragile submarines were helpless. A light gun mounted on, the bow of freighter was enough to sink one. The first generations of submarine were very slow diving.

If a U-boats surfaced to warn an unarmed merchant vessel of its presence, it could be rammed.

Since submarines were tiny, their small crews cramped, there was no room to take aboard survivors.

On May 7, 1915, antisubmarine feelings in the United States burst into fury when English luxury liner Lusitania was torpedoed off the coast of Ireland. 1198 of 1959 passengers and crew aboard were killed, including 139 Americans.

So many lives were lost because the Lusitania went down in a mere eighteen minutes.

Then early in 1916, when the Allies announced that they were arming all merchant ships German responded with a declaration of “unrestricted submarine warfare.” The U-boats would sink all enemy vessels without warning.

President Wilson threatened a to break diplomatic relations with Germany – considered a prelude to a declaration of war – of unrestricted submarine warfare were continued.

The German General Staff did not the United States in the war, Plans for a major offensive were afoot. In any case, the navy did not have enough U-boats to carry out a full scale assault on British shipping. In the Sussex Pledge of May 4, 1916, the German promised Wilson to observe the rules of visit and search before attacking enemy ships.
Submarine Warfare – U-boat Era

10 Eylül 2009 Perşembe

German U-Boats during the Second World War

German U-Boats during the Second World War

The German U-Boat crew in happier times



An U-Boat crew salutes the Nazi flag in 1944

"The Battle of the Atlantic was the only thing that ever frightened me."
Winston Churchill.

And the U-Boats played a big role in the Battle of Atlantic.


The U27: First U-Boat launched by Nazi Germany in 1936

The first sea-going U-boat was U-27 launched in 1936. By 1939, a newer model had much better engine power and greater fuel carrying capacity - the Type VII B. By 1941, this had been overtaken by the Type VII C. These were so successful that over 600 were built.



British Aircraft carrier 'Courageous' sunk by a German sub U-29 in September, 1939

The Type VII C was 220 feet long and displaced about 770 tons on the surface. This U-boat had saddle tanks, four bow tubes and two stern tubes. Her diesel engines gave a top speed of 17 knots on the surface and 7.5 knots underwater. Its only drawback - a major one - was its limited range of operation; 6,500 miles at an average speed of 12 knots. However, her simple design meant that repairs at sea were relatively easy and the Type VII C had a very good reputation for reliability. The Type VII became the standard design for Germany's submarine fleet during World War Two.



The New York Times reports Roosevelt's resolve to make the Atlantic safer.

The collapse of France in June 1940 did a great deal to change submarine warfare. U-boats now had open access to the Atlantic from bases on the western coast of France. Prior to this, U-boats had to move either through the North Sea of the English Channel to get to the Atlantic. Both journeys were fraught with dangers. After June 1940, this problem disappeared.

INSIDE AN U BOAT



An Allies ship shoots off a depth charge

Allies losses in Battle of Atlantic

1939 : 222 ships sunk (114 by submarine)

1940 : 1059 ships sunk (471 by submarine)


1941 : 1328 ships sunk (432 by submarine)

1942 : 1661 ships sunk (1159 by submarine)

1943 : 597 ships sunk (463 by submarine)

1944 : 247 ships sunk (132 by submarine)

1945 : 105 ships sunk (56 by submarine)


An U-Boat under attack

However, the German war machine could not produce enough U-boats fast enough. The Kriegsmarine had developed its requirement strategy around the war being over quickly. 60 U-boats were launched in 1940 - but this represented just over one per week. In the same year, 32 had been lost in action and 2 damaged in accidents.

Allied planes guard convoys

Despite this, they managed to wreak havoc. Individual U-boat captains like Kretschmer were responsible for the sinking of 200,000 tons of shipping alone. If more U-boats had been at sea, the impact of the Battle of the Atlantic could have been far greater for Britain.

For all the success of the U-boats, the Allies were developing a large array of anti-submarine weapons including more modern depth charges, 'hedgehogs', 'squids' and more sophisticated radar equipment, including radar designed to see U-boats on the surface at night. While the U-boats were successful, they were also becoming more and more vulnerable to an attack.

GERMAN U BOAT PROPAGANDA FILM



U-Boat attacked by Allied planes!

Aircraft were fitted with ASV (Air to Surface Vessel radar). This allowed a plane to spot a U-boat on the surface but the U-boat could not pick up ASV on its radar receiver.

The Type XXI was an awesome weapon but too few were ever produced. The Allies could now bomb factories and submarine pens with great frequency and accuracy. Fuel depots were also a target. The Germans may have had a fine submarine on paper but producing it in numbers was a different matter. Dönitz informed Hitler that the first Type XXI would be ready by November 1944. Hitler ordered an earlier date and gave Albert Speer the task of getting the Type XXI produced. But with the Allies and the Russians closing in on both sides of Europe, constant bombing of factories etc, it was an impossible demand.

The Type XXI was commissioned in early 1945 and the first one, U-2511, went to sea just one week before Germany surrendered. On May 7th, 1945, Dönitz ordered all U-boats to cease hostilities.