Mediterranean U-boat Campaign (World War II)

The Mediterranean U-boat Campaign lasted from about 21 September 1941 to 19 September 1944 during the Second World War. Malta was an active British base strategically located near supply routes from Europe to North Africa. Axis supply convoys across the Mediterranean Sea suffered severe losses, which in turn threatened the fighting ability of the Axis armies in North Africa. The Allies were able to keep their North African armies supplied. The ''Kriegsmarine'' tried to isolate Malta but later it concentrated its U-boat operations on disrupting Allied landing operations in southern Europe.

Some 60 German U-boats made the hazardous passage into the Mediterranean Sea from 1941. Only one completed the journey both ways. Karl Dönitz, the Commander-in-Chief, U-boats, ''Befehlshaber der Unterseeboote'' (BdU) was always reluctant to send his boats into the ''Mittelmeer'' but he recognised that natural bottlenecks such as the Straits of Gibraltar were more likely to result in shipping being found and attacked than relying on finding it in the vast Atlantic Ocean.

The U-boats were sent to assist the Italians, although many were attacked in the Strait of Gibraltar and nine were sunk while attempting the passage and ten more were damaged. The Mediterranean is a clear and calm body of water which made escape more difficult for the U-boats. The Axis failed in their objective.

Prior Experience

The Kriegsmarine had acquired some knowledge of the area. Dönitz was an officer aboard which had been sunk in the region in World War I. U-boats had also served in the Spanish Civil War. The Republicans, with twelve submarines, opposed the Nationalists, who had none; the presence of German U-boats was most welcome. The first two vessels, ''U-33'' and ''U-34'', under the codename ''Training Exercise Ursula'', left Wilhelmshaven on 20 November 1936. Both submarines sailed down the English Channel and slipped into the Mediterranean on the night of 27 November. They were soon in action, ''U-34'' fired a single torpedo at a Republican destroyer in the evening of 1 December. The projectile missed, impacting on rocks. The boat, under '' Leutnant zur See'' Harald Grosse, tried again on 5 and 8 December, with an equal lack of success. ''U-33'' fared no better; her commander was frustrated by the absence of target identification or defensive movement of his intended victims. Only one vessel was sunk by the U-boats, the Republican submarine ''C-3'', which was attacked by ''U-34'' on 12 December.

The early years

By October 1939, Dönitz had decided to use three longer-range boats to intercept the first Allied convoys of the war. , and were to rendezvous southwest of Ireland before attempting to force the Straits and attack the convoys in the Mediterranean. Things went quickly wrong, ''U-25'' was diverted to a convoy south-west of Lisbon. After an abortive torpedo attack on a steamer on 31 October, Viktor Schütze, ''U-25''s commander, surfaced and proceeded to sink his target with fire from his deck gun. This course of action caused a crack in a vital part of the submarine, obliging the boat to return to Germany. ''U-53'' ran low on fuel after shadowing a convoy in the Bay of Biscay and was also forced to return. ''U-26'', was compelled by a combination of unsuitable weather, searchlights and British anti-submarine patrols, to abandon an attempt to lay mines near Gibraltar harbour. The boat sailed through the Straits on the surface and claimed but a solitary ship sunk in the Mediterranean. This 'sinking' was not confirmed by post-war analysis.

''U-26'' headed back through the Straits, arriving in Wilhelmshaven on 5 December 1939; the only U-boat to enter and leave the Mediterranean in the war. This mission was summed-up in the BdU ''Kriegstagebuch'' (KTB) War Diary,

It was a mistake to send ''U-25'', ''U-26'' and ''U-53'' into the Mediterranean. ''U-25'' had to return before she ever got there, ''U-53'' did not get through and ''U-26'' hardly encountered any shipping worth mentioning. This patrol shows all the disadvantages of a long outward passage., KTB

Many attacks mentioned were gun actions or ramming, particularly at the eastern end of the Mediterranean. This was because the potential target was "unworthy or difficult torpedo target".

''Afrika Korps''

The 23rd U-boat Flotilla was established in September 1941 to intercept coastal shipping supplying Allied forces in the Siege of Tobruk. U-boats patrolled the eastern Mediterranean from the 23rd flotilla base on Salamis Island in Greece. On 7 December, control of the 23rd Flotilla was transferred from Kernével to The Commander in Chief in the South (''Oberbefehlshaber Süd'', OB Süd) Albert Kesselring. Additional bases were established in Pula in Croatia and La Spezia in northern Italy as more U-boats were ordered to the Mediterranean, until focus shifted to the western Atlantic through the Second Happy Time.Blair (1996) pp.395-404
* passed Gibraltar on 21 September 1941.Blair (1996) pp.735–736
* passed Gibraltar on 26 September 1941, and sank on 27 November, the 3,059-ton ''Shuntien'' of convoy TA 5 on 23 December, and the 2,487-ton ''Warszawa'' of convoy AT 6 on 26 December.
* passed Gibraltar on 27 September 1941, sank the 1,208-ton ''Samos'' and the 758-ton ''Pass of Balmaha'' on 17 October.
* passed Gibraltar on 30 September, destroyed a 372-ton British landing craft on 10 October, and sank on 25 November 1941.
* passed Gibraltar on 3 October, sank two 372-ton British landing craft on 12 October, and sank the 1,587-ton ''Volo'' of convoy ME 8 before being sunk by convoy escort on 28 December 1941.Blair (1996) pp.403, 735–736
* passed Gibraltar on 5 October, damaged on 21 October, and was sunk on 23 December 1941 by Royal Navy destroyers.
* passed Gibraltar on 11 November 1941.
* passed Gibraltar on 12 November and sank on 13 November 1941.
* was sunk near Gibraltar on 16 November 1941 by .
* passed Gibraltar on 16 November 1941.
* passed Gibraltar on 24 November 1941 and damaged the 3,560-ton ''Myriel'' on 13 December.
* passed Gibraltar on 26 November, sank the 4,032-ton ''Fjord'' on 2 December, then sank on 15 December, and was sunk on 16 December 1941 by the .
* passed Gibraltar on 27 November 1941 and sank the 4,274-ton ''Grelhead'' on 2 December.
* was torpedoed by the Dutch submarine ''O 21'' while passing Gibraltar on 28 November 1941.
* passed Gibraltar on 29 November 1941, sank the 1,595-ton ''Saint Denis'' on 9 December, and sank the 6,557-ton ''Varlaam Avanesov'' on 19 December.
* passed Gibraltar on 8 December 1941.
* passed Gibraltar on 9 December 1941.
* passed Gibraltar on 9 December 1941 and sank the Spanish ship ''Badalona'' on 13 December.
* sank the trawler HMS ''Lady Shirley'' and the patrol yacht HMS ''Rosabelle'' while passing Gibraltar on 10 December 1941 and was torpedoed by on 12 January 1942.
* passed Gibraltar on 10 December 1941 and sank on 24 December
* passed Gibraltar on 15 December 1941.
* passed Gibraltar on 16 December 1941 and damaged on 12 January 1942.
* passed Gibraltar on 18 December 1941.
* passed Gibraltar on 18 December 1941 and sank the 5,289-ton ''Hellen'' on 21 December.
* was sunk by Fairey Swordfish from 812 Naval Air Squadron while passing Gibraltar on 21 December 1941.
* passed Gibraltar on 21 December 1941.
* passed Gibraltar on 23 December 1941 and was sunk by aircraft on 9 January 1942.
* passed Gibraltar on 14 January.
* passed Gibraltar on 15 January 1942

Second Happy Time

La Spezia became headquarters when the Mediterranean U-boats were reorganized as the 29th U-boat Flotilla in May 1942. No more U-boats were assigned to the Mediterranean from mid-January to early October 1942 as opportunities along the east coast of North America seemed more productive while the ''Afrika Korps'' was successfully advancing on Egypt. The 29th flotilla focused on convoys supplying Malta and British forces on the Egyptian coast. For sustained operations, U-boats spent approximately one-third of the time on patrol stations, one-third in transit to and from base for routine provisioning and refueling, and one-third undergoing major overhaul or battle repair. 29th flotilla target strength of twenty U-boats enabled a routine patrol strength of three U-boats from Salamis in the eastern Mediterranean, and three from La Spezia in the western Mediterranean. Loss of ''U-372'' and ''U-568'' in twelve-hour sustained attacks demonstrated vulnerability of independent U-boat patrols to a team of destroyers which could hunt a submerged U-boat to exhaustion of air and battery power, rather than moving on after a few attacks.Blair (1996) pp.645–654
* sank on 11 August 1942.
* was sunk on 2 May 1942 by aircraft and destroyers.
* sank on 12 June. ''U-77'' then sank sailing ships ''Vassiliki'' on 22 July, ''Toufic El Rahman'' on 24 July, ''Fany'' on 30 July, and ''Saint Simon'' on 1 August. ''U-77'' continued patrolling the coast of Cyprus, Palestine and Lebanon damaging ''Adnan'' and sinking ''Ezzet'' on 6 August, ''Kharouf'' on 10 August and ''Daniel'' on 16 August 1942.
* sank the 6,018-ton ''Caspia'', the French trawler ''Viking'', and sailing ships ''Bab el Faraq'' and ''Farouh el Kher'' on 16 April 1942. ''U-81'' sank sailing ships ''Hefz el Rahman'' on 19 April, ''Aziza'' and the ''El Saadiah'' on 22 April, and then 2,073-ton ''Havre'' of convoy AT 49 on 10 June 1942.
* damaged the 2,590-ton ''Crista'' on 17 March 1942, sank the 100-ton ''Esther'' and the 231-ton ''Said'' on 8 June, the 175-ton ''Typhoon'' on 9 June, the Q-ship HMS ''Farouk'' on 13 June, and the 5,875-ton ''Princess Marguerite'' on 17 August 1942.
* sank the 1,755-ton ''Memas'' and the 1,433-ton ''Zealand'' from convoy ''Metril'' on 28 June 1942, and sank the 786-ton ''Marilyse Moller'' on 1 July.
* sank on 17 January 1942Blair (1996) pp.553–554 and sank after striking a mine off Salamis on 12 March 1942.
* sank the 2,623-ton ''Slavol'' on 26 March 1942, and sank on 16 June 1942.
* shelled the Beirut electric power station in April 1942.
*
* sank on 30 June 1942, and was hunted to exhaustion on 3 August 1942.
* sank the 1,376-ton ''Hero'' on 6 July 1942, sank the 87-ton ''Amina'' and the 176-ton ''Ikbal'' on 30 July, and damaged the 6,288-ton ''Empire Kumari'' of convoy LW 38 on 26 August. She also sank the 558-ton ''Arnon'', the 38-ton ''Miriam'' and the 108-ton ''Salina'' on 3 September. She then sank the 113-ton ''Turkian'' on 6 September 1942.
* sank the trawler HMS ''Sotra'' on 29 January 1942, she then sank the 4,216-ton ''Eocene'' of convoy AT 46 on 20 May, and damaged LCT-119 on 20 June 1942.
* damaged the hospital ship ''Somersetshire'' on 7 April 1942.
* sank the 4,681-ton ''Athene'' and damaged the 5,917-ton ''Brambleleaf'' of convoy AT 49 on 10 June 1942.
* planted a minefield at the mouth of the Suez Canal, sinking the 6,692-ton ''Mount Olympus'', and damaging the 5,062-ton ''Hav'' and the 4,043-ton ''Fred''.
* damaged the 3,359-ton ''Adinda'' on 24 July 1942.
* sank on 11 March 1942 and the 1,361-ton ''Kirkland'' of convoy TA 36 on 23 April.
* was hunted to exhaustion on 28 May 1942.
* was interned in Spain following bomb damage on 1 May 1942.
* sank on 20 March 1942, sank on 26 March and was sunk on 2 June 1942 by 815 Naval Air Squadron.

Allied invasion of North Africa

More U-boats were assigned to the 29th flotilla when improved anti-submarine warfare (ASW) measures along the east coast of North America ended the Second Happy Time. When a Short Sunderland found ''U-559'', the aircraft summoned five destroyers able to maintain contact and drop 150 depth charges over ten hours, until the submarine attempted to sneak away on the surface at night. Waiting destroyers open fire as soon as the U-boat surfaced and the U-boat crew abandoned ship. The Royal Navy boarded the sinking U-boat and recovered German code documents before ''U-559'' sank.Blair (1998) pp.81–103

The Second Battle of El Alamein prompted a concentration of U-boats in the western Mediterranean, in anticipation of Allied amphibious invasion. Five U-boats made contact with Operation Torch convoys, and two wolfpacks assembled near the invasion points. ''U-73'', ''U-81'', ''U-458'', ''U-565'', ''U-593'', ''U-595'', ''U-605'' and ''U-617'' assembled around Oran as ''Gruppe Delphin'' (Group Dolphin); ''U-77'', ''U-205'', ''U-331'', ''U-431'', ''U-561'' and ''U-660'' assembled around Algiers as ''Gruppe Hai'' (Group Shark). Five U-boats were sunk opposing the invasion.
* damaged the 7,453-ton ''Lalande'' on 14 November 1942 and sank the Liberty ship ''Arthur Middleton'' of convoy UGS 3 on 1 January 1943.
* sank the 18-ton ''Mahrous'' on 20 October 1942, damaged HMS ''Stork'' on 12 November, and sank the 6,699-ton ''Empire Banner'' and the 7,043-ton ''Empire Webster'' of convoy KMS 8 on 7 February. ''U-77'' damaged the 5,222-ton ''Hadleigh'' and the 5,229-ton ''Merchant Prince'' of convoy ET 14 on 16 March and was sunk on 29 March 1943 by Lockheed Hudsons.Blair (1998) pp.208–217
* sank the 2,012-ton ''Garlinge'' on 10 November 1942 and the 6,487-ton ''Maron'' on 13 November. ''U-81'' damaged the 6,671-ton ''Saroena'' on 10 February 1943 and sank sailing ships ''Al Kasbanah'', ''Dolphin'', ''Husni'', and ''Sabah el Kheir'' on 11 February. ''U-81'' sank the 244-ton ''Bourghieh'' and sailing ship ''Mawahab Allah'' on 20 March 1943, and sailing ship ''Rousdi'' on 28 March.
* was sunk on 23 March 1943 by a Lockheed Hudson of 500 Squadron RAF.
* was under repair at Salamis.
* was sunk on 17 February 1943 by aircraft and destroyers.
* sank on 9 November 1942 before being sunk by aircraft on 17 November.
* sank the trawler HMS ''Jura'' and damaged the 7,159-ton ''Ville de Strasbourg'' of convoy MKS 5 on 7 January 1943 before sinking the 2,089-ton ''Fintra'' on 23 February and damaging the Liberty ship ''Daniel Carroll'' of convoy TE 16 on 28 February.
* damaged on 1 December 1942.
* sank on 10 November 1942, on 13 November, and sailing ships ''Alexandria'' on 23 January 1943, ''Mouyassar'' and ''Omar el Kattab'' on 25 January, and ''Hassan'' on 26 January, before damaging the 6,415-ton ''City of Perth'' of convoy MKS 10 on 26 March 1943.
* sank the 5,859-ton ''Jean Jadot'' of convoy KMS 7 on 20 January 1943.
* sank 200-ton '' Bringhi'' on 12 October 1942 and was hunted to exhaustion on 30 October.
* sank 39-ton ''Sphinx'' on 24 September 1942.
* sank the 23,722-ton ''Strathallan'' of convoy KMF 5 on 21 December 1942, and was sunk on 23 February 1943 by aircraft and destroyers.
* sank on 18 December 1942, damaged the Liberty ship ''Nathanael Greene'' of convoy MKS 8 on 24 February 1943, and damaged the 10,389-ton ''Seminole'' of convoy TE 16 on 27 February.

Replacement U-boats

* passed Gibraltar on 10 OctoberBlair (1998) pp.735–751 and was sunk off Oran on 14 November 1942 by a Lockheed Hudson of No. 233 Squadron RAF.
* passed Gibraltar on 11 October 1942.
* passed Gibraltar on 11 October 1942; and sank 5,332-ton ''Browning'' of convoy KMS 2 on 12 November 1,940-ton ''Daflia'' and 2,626-ton ''Kaying'' on 18 March 1943, and 5,157-ton ''City of Guildford'' of convoy XT 7 on 27 March.
* passed Gibraltar on 11 October and was sunk off Oran on 12 November 1942 by destroyers.
* passed Gibraltar on 8 November 1942, sank the tug HMS ''Saint Issey'' on 28 December, 5,324-ton ''Annitsa'' and 1,862-ton ''Harboe Jensen'' on 15 January 1943, on 1 February, and 3,264-ton ''Corona'' and 1,350-ton ''Henrik'' of convoy AW 22 on 5 February.
* passed Gibraltar on 9 November 1942 and sank the 19,627-ton ''Viceroy of India'' on 11 November.
* passed Gibraltar on 9 November and was sunk off Oran on 14 November 1942 by Lockheed Hudsons.
* passed Gibraltar on 9 November 1942, sank LCI-162 on 7 February 1943, damaged 7,047-ton ''Empire Standard'' and Fort ship ''Fort Norman'' of convoy KMS 10 on 9 March, and sank Fort ship ''Fort a la Corne'' and 9,551-ton ''Hallanger'' of convoy ET 16 on 30 March 1943.
* passed Gibraltar on 9 November 1942 and sank the trawler ''Sergent Gouarne'' on 26 March 1943.
* passed Gibraltar on 11 November and was sunk on 15 November 1942 by a Lockheed Hudson of No. 500 Squadron RAF.
* passed Gibraltar and sank 11,069-ton ''Nieuw Zealand'' on 11 November 1942, and damaged Ocean ship ''Ocean Seaman'' of convoy ET 14 on 15 March 1943.
* passed Gibraltar on 5 December 1942, and sank on 11 December and 1592-ton ''Edencrag'' of convoy TE 9 on 14 December before being sunk by destroyers on 23 February 1943.
* passed Gibraltar on 8 December 1942 and damaged on 9 December.
* passed Gibraltar on 9 December 1942 and was torpedoed by on 20 January 1943.
* passed Gibraltar on 9 January 1943 and was sunk on 13 January by .

Axis defeat in Tunisia

Allied armies advancing through North Africa and Sicily constructed a system of airfields increasing the frequency of U-boat detection by aircraft. The 29th Flotilla focused on western Mediterranean convoys supplying Allied troops but three U-boats were based at Salamis to maintain an eastern Mediterranean patrol presence, forcing the Allies to disperse their ASW efforts. On 1 August 1943 the 29th Flotilla shifted its headquarters from La Spezia to Toulon where it could use the former French naval base for patrols in the western Mediterranean.
* sank the 1,598-ton ''Brinkburn'' of convoy TE 22 on 21 June, and damaged the 8,299-ton ''Abbeydale'' of convoy XTG 2 on 27 June 1943.
* sank the 8,131-ton ''Yoma'' of convoy GTX 2 on 17 June, the sailing ship ''Nisr'' on 25 June, sailing ships ''Nelly'' and ''Toufic Allah'' on 26 June, and the 3,742-ton ''Michalios'' on 27 June, before damaging the 7,472-ton ''Empire Moon'' on 22 July.
* sank the 1,179-ton ''Palima'' on 12 June 1943 and the 8,995-ton ''Athelmonarch'' on 15 June before being sunk on 16 June by a Lockheed Hudson of No. 459 Squadron RAAF.Blair (1998) pp.375–381
* sank the 1,162-ton ''Merope'' on 27 April, damaged the Liberty ship ''Matthew Maury'' and the 6,561-ton ''Gulfprince'' of convoy ET 22A on 10 July 1943, and sank the 6,004-ton ''Contractor'' of convoy GTX 5 on 7 August 1943.
* sank the 5,634-ton ''Saint Essylt'' of convoy KMS 18B on 4 July 1943 before being sunk on 30 July 1943 by PC-624.
* damaged Liberty ship ''Pierre Soulé'' on 23 August 1943.
* damaged on 23 July 1943.
*
* damaged the 6,894-ton ''Oligarch'' of convoy GTX 3 on 30 June, and sank the 5,454-ton ''Shahjehan'' of convoy MWS 36 on 6 July 1943.
* was sunk on 22 August 1943 by the escort of convoy MKF 22.
* was sunk on 12 July 1943 by ''MTB-81''.
* sank the 5,594-ton ''Michigan'' and 4,392-ton ''Sidi-Bel-Abbès'' of convoy UGS 7 on 20 April 1943.
* sank 1858-ton ''Runo'' on 11 April, then damaged LST-333 and LST-387 on 22 June and sank 6,054-ton ''Devis'' of convoy KMS 18B on 5 July 1943.
* sank 68-ton ''El Sayeda'' on 20 August 1943 and 130-ton ''Lily'', 50-ton ''Namaz'' and 21-ton ''Panikos'' on 21 August. ''U-596'' then sank 183-ton ''Nagwa'' on 30 August and 80-ton ''Hamidieh'' on 7 September.
* was lost to unknown causes in April 1943.
* sank on 6 September.
* sank 928-ton ''Simon Duhamel II'' of convoy TE 20 on 2 April before being sunk by a Lockheed Hudson of No. 608 Squadron RAF on 28 May 1943.

Replacements

* passed Gibraltar on 9 April and was torpedoed by on 21 May 1943.
* passed Gibraltar on 9 April, sank 5979-ton ''Empire Eve'' and damaged Fort ship ''Fort Anne'' of convoy KMS 14 on 18 May before being sunk on 25 May 1943 by .
* passed Gibraltar on 6 May 1943, and sank Liberty ships ''Richard Henderson'' and ''John Bell'' of convoy UGS 14 on 23 August 1943.
* was sunk off Gibraltar on 7 May 1943 by Lockheed Hudsons of No. 233 Squadron RAF.
* passed Gibraltar on 7 May 1943.
* passed Gibraltar on 5 June, sank the 8,762-ton on 4 July and was sunk on 12 July 1943 by .

After the Italian armistice

As Allied escort forces in the Mediterranean became more numerous, the tactic of hunting a detected U-boat to exhaustion was given the name ''Swamp'' and used with increasing frequency. U-boats launched G7es torpedoes with passive homing against destroyers, but were unable to cope with a team of escorts. U-boats remaining in port were subjected to USAAF air raids from newly constructed airfields. Surviving U-boats at Toulon were scuttled when Operation Dragoon, (the invasion of southern France), closed the 29th Flotilla base on 15 August 1944. Three U-boats remained at Salamis until Allied forces reached them on 19 September 1944.Blair (1998) pp.518–526
* damaged the Liberty ship ''John S. Copley'' of convoy GUS 24 and was sunk by the convoy escort on 16 December 1943.Blair (1998) pp.455–458
* sank the 2,887-ton ''Empire Dunstan'' on 18 November 1943 before being destroyed by a 9 January 1944 USAAF raid on Pula.
* sank on 11 October, on 13 October, and damaged the Liberty ship ''James Russell Lowell'' of convoy GUS 18 on 15 October. ''U-371'' sank the 17,024-ton ''Dempo'' and destroyed the 6,165-ton ''Maiden Creek'' of convoy SNF 17 on 17 March 1944 and damaged and the French destroyer escort ''Sénégalais'' from convoy GUS 38 with G7es torpedoes on 3 May 1944 while being hunted to exhaustion by convoy escorts.
* was destroyed by an 11 March 1944 USAAF raid on Toulon.
* damaged on 28 November 1943, sank 55-ton ''Rod el Faraq'' on 27 February 1944, and damaged 6207-ton ''Ensis'' on 29 February. ''U-407'' then sank 7210-ton ''Meyer London'' and damaged Liberty ship ''Thomas G. Masaryk'' of convoy UGS 37 on 16 April, and was sunk by destroyers off Salamis on 19 September 1944.
* sank Liberty ship ''Christian Michelsen'' of convoy UGS 17 on 26 September 1943. ''U-410'' then sank Fort ship ''Fort Howe'' and damaged 3722-ton ''Empire Commerce'' of convoy MKS 26 on 1 October and sank Fort ship ''Fort Saint Nicolas'' on 15 February 1944, on 18 February, and LST-348 on 20 February before being destroyed by an 11 March 1944 USAAF raid on Toulon.
* was sunk on 21 October 1943 by a Vickers Wellington of 179 Squadron.
* sank the 80-ton ''Aqia Paraskevi'', the 67-ton ''Himli'', and the 81-ton ''Salem'' on 1 February 1944 and the 64-ton ''Yahiya'' on 2 February. She then sank Fort ship ''Fort Missanabie'' of convoy HA 43 on 19 May and was hunted to exhaustion by convoy escorts on 21 May 1944.
* was scuttled at Salamis on 19 September 1944.Taylor (1966) p.132
* sank Liberty ship ''William W. Gerhard'' of convoy NSS 3 on 21 September 1943, on 25 September, 4531-ton ''Mont Viso'' of convoy KMS 30 on 3 November, and and of convoy KMS 34 with G7es torpedoes on 12 December while being hunted to exhaustion by the convoy escort on 13 December 1943.
* sank 5542-ton ''Marit'' of convoy XT 4 on 4 October and 8009-ton ''Cap Padaran'' of convoy HA 11 on 9 December 1943 before being scuttled at Salamis on 19 September 1944.
* sank on 9 October 1943 and LCT-553 on 11 October, and damaged 7127-ton Fort ship ''Fort Fidler'' and 10,627-ton ''G.S. Walden'' of convoy GUS 39 with G7es torpedoes before being hunted to exhaustion by convoy escorts on 14 May 1944.
* was sunk on 11 September 1943 by Vickers Wellingtons of 179 Squadron.Blair (1998) pp.411–414

Replacements

* passed Gibraltar on 26 September 1943, damaged 4970-ton ''Stanmore'' of convoy KMS 27 on 2 October, damaged with a G7es torpedo on 11 December, and sank with a G7es torpedo while being hunted to exhaustion on 29 March 1944.
* passed Gibraltar on 1 November 1943 and was sunk on 10 March 1944 by Royal Navy destroyers.
* passed Gibraltar on 3 November 1943 and was destroyed in Toulon by USAAF raids on 5 July and 6 August 1944.Blair (1998) pp.526, 735–751
* passed Gibraltar on 5 December 1943, sank LST-418 on 16 February 1944, LST-305 on 20 February, and PC-558 on 9 May before being scuttled at Toulon on 21 August 1944.
* passed Gibraltar on 3 January 1944, sank Liberty ship ''William B. Woods'' on 10 March and was destroyed in Toulon by USAAF raids on 5 July and 6 August 1944.
* passed Gibraltar on 5 January 1944 and was sunk on 10 March 1944 by the trawler ''Mull''.
* passed Gibraltar on 22 January 1944 and was lost to unknown causes some time after 6 April 1944.Blair (1998) pp.521, 735–751
* passed Gibraltar on 3 February 1944, damaged Liberty ships ''George Cleeve'' and ''Peter Skene Ogden'' of convoy GUS 31 on 22 February, and was destroyed in Toulon by USAAF raids on 5 July and 6 August 1944.
* passed Gibraltar on 13 February 1944 and was destroyed in Toulon by USAAF raids on 5 July and 6 August 1944.
* passed Gibraltar on 12 February 1944, sank with a G7es torpedo on 5 May, and was scuttled at Toulon on 11 August 1944.
* passed Gibraltar on 20 March 1944 and was destroyed by a 29 April 1944 USAAF raid on Toulon.
* passed Gibraltar on 22 March 1944 and was scuttled at Toulon on 19 August 1944.
* passed Gibraltar on 31 March 1944 and was destroyed in Toulon by USAAF raids on 5 July and 6 August 1944.
* passed Gibraltar on 30 April 1944 and was hunted to exhaustion on 19 May 1944.Blair (1998) pp.525–526, 735–751

Success and failure

The Germans sank 95 Allied merchant ships totalling 449,206 tons and 24 Royal Navy warships including two carriers, one battleship, four cruisers and 12 destroyers at the cost of 62 U-boats. Noteworthy successes were the sinking of , , and .

U-boats sunk by Allied submarines

Four U-boats were sunk by Allied submarines in the Mediterranean:
* was sunk on 28 November 1941 in the western Mediterranean, south-west of Almería, in position by torpedoes from the Dutch submarine HrMs ''O 21''. 35 crewmembers died and 12 survived.
* was sunk on 21 January 1943 in the Mediterranean, west of Bonifacio, in position by torpedoes from the British submarine . 45 crewmembers died and 1 survived.
* was sunk on 21 May 1943 in the western Mediterranean south of Toulon, in position by torpedoes from the British submarine . 20 crewmembers died and 28 survived.
* was sunk on 12 January 1942 in the western Mediterranean, east of Cape Spartivento, in position , by torpedoes from the British submarine . Only one crewmember out of 45 survived.

See also

* Military history of Gibraltar during World War II
* 29th U-boat Flotilla

References

Bibliography

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{{Uboat

Military history of the Mediterranean
Allied naval victories in the battle of the Mediterranean
Submarine warfare in World War II
U-boats
Gibraltar in World War II