U-boat U-110

German submarine ''U-110'' was a Type IXB U-boat of Nazi Germany's ''Kriegsmarine'' that operated during World War II. She was captured by the Royal Navy on 9 May 1941 and provided a number of secret cipher documents to the British. ''U-110''s capture, later given the code name "Operation Primrose", was one of the biggest secrets of the war, remaining so for seven months. President Franklin D. Roosevelt was only told of the capture by Winston Churchill in January 1942.

Design

Type IXB submarines were slightly larger than the original Type IX submarines, later designated IXA. ''U-110'' had a displacement of when at the surface and while submerged. The U-boat had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two MAN M 9 V 40/46 supercharged four-stroke, nine-cylinder diesel engines producing a total of for use while surfaced, two Siemens-Schuckert 2 GU 345/34 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .

The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . ''U-110'' was fitted with six torpedo tubes (four fitted at the bow and two at the stern), 22 torpedoes, one SK C/32 naval gun, 180 rounds, and a SK C/30 as well as a C/30 anti-aircraft gun. The boat had a complement of forty-eight.

Service history

''U-110''s keel was laid down 1 February 1940 by DeSchiMAG AG Weser, of Bremen, Germany as yard number 973. She was launched on 25 August 1940 and commissioned on 21 November with ''Kapitänleutnant'' Fritz-Julius Lemp in command.

The boat was part of the 2nd U-boat Flotilla from her commissioning date until her loss. Lemp commanded ''U-110'' for her entire career. In an earlier boat (), he was responsible for the sinking of the passenger liner ''SS Athenia'' on the first day of the war. The circumstances were such that he was considered for court-martial. He continued, however, to be one of the most successful and rebellious commanders of his day.

Operational career

First patrol

''U-110'' set out on her first patrol from Kiel on 9 March 1941. Her route to the Atlantic Ocean took her through the gap between the Faroe and Shetland Islands. Her first victim was ''Erodona'' which she damaged south of Iceland on 16 March. She also damaged ''Siremalm'' on the 23rd. This ship only escaped after she was hit by a torpedo which failed to detonate, (although it left a large dent) and the U-boat's 105 mm deck gun crew forgot to remove the tampion in the muzzle before engaging their target. The resulting explosion on firing the first round wounded three men and compelled the boat to fire on the merchantman with the smaller 37 and 20 mm armament. Despite being hit, ''Siremalm'' successfully fled the scene, zig-zagging as she went.

''U-110'' arrived in Lorient on the French Atlantic coast on 29 March, having cut the patrol short due to damage from the exploding gun.

Second patrol and capture

The boat departed Lorient on 15 April 1941. On the 27th, she sank ''Henri Mory'' about west northwest of Blasket Islands, Ireland.

Her next quarry were the ships of convoy OB 318 east of Cape Farewell (Greenland). She successfully attacked and sank ''Esmond'' and ''Bengore Head'', but the escort vessels responded. The British corvette located the U-boat with ASDIC (sonar). ''Aubrietia'' and British destroyer then proceeded to drop depth charges, forcing ''U-110'' to surface.

Operation ''Primrose'' (9 May 1941)

''U-110'' survived the attack, but was seriously damaged. and ''Broadway'' remained in contact after ''Aubrietia''s last attack. ''Broadway'' shaped course to ram, but fired two depth charges beneath the U-boat instead, in an endeavour to make the crew abandon ship before scuttling her. Lemp announced "Last stop, everybody out", meaning "Abandon ship". As the crew turned out onto the U-boat's deck they came under fire from ''Bulldog'' and ''Broadway'' with casualties from gunfire and drowning. The British had believed that the German deck gun was to be used and ceased fire when they realised that the U-boat was being abandoned and the crew wanted to surrender.

Lemp realised that ''U-110'' was not sinking and attempted to swim back to it to destroy the secret material, and was never seen again. A German eyewitness testified that he was shot in the water by a British sailor, but his fate is not confirmed. Including Lemp, 15 men were killed in the action, and 32 were captured. Radio Officer Georg Högel and the rest of the crew were held at ''Camp 23'' ( Monteith POW camp at Iroquois Falls, Northern Ontario, Canada), which is now the Monteith Correctional Complex party, led by Sub-Lieutenant David Balme, got onto ''U-110'' and stripped it of everything portable, including her Kurzsignale code book and Enigma machine. William Stewart Pollock, a former radio operator in the Royal Navy and on loan to ''Bulldog'', was on the second boat to board ''U-110''. He retrieved the Enigma machine and books as they looked out of place in the radio room. ''U-110'' was taken in tow back toward Britain, but was intentionally sunk en route to prevent its capture from being revealed.

The documents captured from ''U-110'' helped Bletchley Park codebreakers solve '' Reservehandverfahren'', a reserve German hand cipher.

Wolfpacks

''U-110'' took part in one wolfpack, West (9 May 1941).

Modern-day connections

The 2000 film '' U-571'' was partially inspired by the capture of ''U-110''.

In 2007, the submarine's chronometer was featured on the BBC programme ''Antiques Roadshow'', from Alnwick Castle, in the possession of the grandson of the captain of the ship which captured her.

Summary of raiding history

Other captured U-boats

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* ''U-570'', later
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See also

* '' U-559''

References

Bibliography

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* Hugh Sebag-Montefiore, ''Enigma: The Battle for the Code'', 2000, .

External links

Enigma and Operation Primrose

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{{DEFAULTSORT:U0110
1940 ships
Captured U-boats
Enigma machine
German Type IX submarines
Maritime incidents in May 1941
Naval ships of Germany captured by the United Kingdom during World War II
Ships built in Bremen (state)
U-boats commissioned in 1940
World War II shipwrecks in the Atlantic Ocean
World War II submarines of Germany