Convoy HG 76

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Convoy HG 76
Part of World War II
Celtic Sea and Bay of Biscay bathymetric map-en.svg
Map of the Bay of Biscay and the South-west Approaches
Date 19–23 December 1941
Location Bay of Biscay, South-west Approaches
Coordinates: 45°30′N 04°20′W / 45.500°N 4.333°W / 45.500; -4.333
Result British victory
Belligerents
War Ensign of Germany (1938-1945).svg Germany Naval Ensign of the United Kingdom.svg United Kingdom
Commanders and leaders
Admiral Karl Dönitz Commodore: Sir Raymond Fitzmaurice
Escort Cdr: Capt. Frederic John Walker
Strength
Wolfpack Seeräuber
10 U-boats
HG 76
32 merchant ships
24 escorts
Casualties and losses
5 U-boats destroyed 2 merchant ships sunk
2 escorts sunk

HG 76 was an Allied convoy of the HG (Homeward from Gibraltar) series during World War II. It was notable in seeing the destruction of five German U-boats (the true total was not known to the British until after the war) and two Focke-Wulf Condor long-range reconnaissance aircraft by Martlet fighters flying from the escort carrier HMS Audacity, for the loss of Audacity, a destroyer and two merchant ships. It was regarded as the first big convoy victory for the Allies in the Battle of the Atlantic.

Background[edit]

HMS Audacity[edit]

Audacity participated in the escort of convoy OG 76 of twenty merchant ships, which sailed from Liverpool for Gibraltar on 31 October. The escort carrier embarked 802 Naval Air Squadron (802 NAS) of the Fleet Air Arm with eight Martlets and ten pilots.[1][a] The weather was atrocious and at times pitched the flight deck 65 ft (20 m) and rolled it 16°, with spray sweeping over the deck. Two Martlets took off on patrol and one managed a safe landing but the other touched down when the stern was rising and was thrown overboard, the pilot being rescued just before the Martlet sank.[2]

On 8 November, Kampfgeschwader 40 (KG 40) sent six Focke-Wulf Condor aircraft to locate convoy SL 91, from Freetown in Sierra Leone bound for Liverpool.[2] Near noon, the radar on Audacity detected two of the Condors and a Martlet patrol was sent to intercept. One Condor escaped in cloud but two Martlets caught the second, which shot down one Martlet before the other Martlet shot it down. About three hours later, another Condor was shot down by a head-on attack and a fourth Condor escaped. KG 40 had lost a third of its operational aircraft and failed to direct any U-boats onto either convoy, OG 76 making a safe arrival at Gibraltar late on 11 November. The presence of Audacity was now known to KG 40 and Befehlshaber der U-Boote (BdU, U-boat command headquarters and the title of the commander, Viceadmiral Karl Dönitz).[2]

HG 76[edit]

HMS Audacity, after conversion to an escort carrier

HG 76 (convoy Commodore Vice-Admiral R. Fitzmaurice) comprised 32 ships homeward bound from Gibraltar, many in ballast, or carrying trade goods. The convoy had a strong escort, consisting of 36th Escort Group (Commander F. J. "Johnnie" Walker on his first voyage as commander), usually composed of two Bittern-class sloops (Stork and Deptford) and seven corvettes (Convolvulus, Gardenia, Marigold, Penstemon, Rhodedendron, Samphire and Vetch).[3] This force was augmented by the new escort carrier Audacity, and her three escorting destroyers, Blankney, Stanley and Exmoor, plus the sloops Fowey and Black Swan and the corvettes Carnation and La Malouine; a total of 17 warships.[4]

Seeräuber[edit]

Since August 1940, Dönitz had ended the practice of U-boats freelancing and sending only one report per day. U-boat commanders were ordered to signal whenever they found a convoy and shadow it rather than attack. The commander was to send short homing signals every thirty minutes, to guide other U-boats to the convoy. When the pack had assembled, Dönitz gave the order to attack, usually at night, so that the U-boats could fire their torpedoes on the surface. For the tactic to work, U-boats had to signal their positions to Dönitz at Kerneval (across the river from Keroman Submarine Base at Lorient in Brittany).[5][b] Closer to land, when Condors on Fühlungshalter patrol sighted a convoy, the wireless operator reported its position and course to the BdU and relays of Condors remained over the convoy.[7] When the position of a convoy was established, the information was passed to the senior officer of a group of U-boats organised for pack attacks, who ordered the boat nearest to the convoy to shadow it and guide the rest by wireless. When the pack had rendezvoused near the convoy, surface attacks would be made on successive nights, the U-boats withdrawing during the day.[8] Dönitz assembled wolfpack Seeräuber (Pirate) of six U-boats, (U-67, U-107, U-108, U-131, U-434 and U-574). The pack was reinforced later by three more boats and was given orders to treat Audacity as a prime target.[3]

Battle[edit]

14–15 December[edit]

HG 76 sailed from Gibraltar on 14 December 1941 and was reported almost immediately by German agents across the bay in neutral Spain, who reported the composition, escort strength and departure time of the convoy. HG 76 was also sighted later that day by U-74, en route to the Mediterranean but was lost in poor visibility, while BdU was confused by an agent report that the convoy had returned to port. Fairey Swordfish aircraft of RAF Gibraltar Command (Air Commodore Sturley Simpson) escorted the convoy and on three occasions during the night of 14/15 December, drove off U-boats.[9][10] The wolf pack formed a patrol line south of Cape St Vincent but HG 76 passed through the line without detection. At 8:15 a.m. Lockheed Hudson and Consolidated Catalina aircraft took over from the Swordfish and for the next two days co-operated with the 802 NAS Martlets on Audacity, forcing U-boats to submerge.[10] U-127 was detected on a routine anti-submarine sweep by a Short Sunderland from Gibraltar late in the day and next morning was detected on Asdic by the Australian destroyer HMAS Nestor and sunk at 11:00 a.m.[11]

16–18 December[edit]

On 16 December, HG 76 was sighted and its position reported by a Focke-Wulf Condor patrolling from Bordeaux, which guided U-108 to the convoy to begin reporting its position to other U-boats. During the night of 16/17 December, the wolf pack closed in and by morning on 17 December, the convoy passed beyond the range of Gibraltar-based aircraft and four U-boats made contact. Just after 9:00 a.m. a Martlet from Audacity sighted a surfaced U-boat about 20 nmi (37 km; 23 mi) from the convoy and circled over the area to enable the escort ships to gain a good radar fix and a corvette made an Asdic attack to no apparent effect. At 12:47 p.m. Stanley sighted U-131 (Baumann) on the surface and Walker ordered a Martlet to attack, while Stork, with Penstemon and the three destroyers made their best speed to the location.[4] The Martlet pilot dived towards the U-boat and both opened fire at the same time, the Martlet crashing and the pilot being killed. The British ships opened fire at extreme range and U-131 was driven to the surface and sunk. Observers saw the crew of U-131 abandon the vessel, before it sank at 1:30 p.m. Survivors said that they had been shadowing the convoy (claiming to have spent the previous night inside the convoy, homing other U-boats) and had been the U-boat attacked earlier.[12]

Location of Madeira

On the night of 17/18 December, the U-boats attacked again but failed to torpedo any ships. At 9:06 a.m. on 18 December, Stanley gained an Asdic contact 6 nmi (11 km; 6.9 mi) and several ships dropped fifty depth charges.[13] After thirty minutes U-434 (Heyda) surfaced and the crew abandoned ship just before it rolled over and sank north of Madeira, 42 members of the crew being rescued and taken prisoner.[13] Before noon, the radar on Audacity indicated two aircraft and Martlets were scrambled to intercept but the guns on both aircraft jammed and the Condors escaped. The rest of the day was quiet but the Admiralty signalled that three more U-boats were en route and after dusk, a corvette reported a surfaced U-boat.[13] On the night of 18/19 December, Stanley sighted U-574 (Gentelbach) astern at 4:00 a.m., sent a sighting report and was hit by a torpedo and blew up. Stork following behind, swung behind the stern of Stanley, gained an Asdic contact and dropped a pattern of depth charges, then turned after 0.5 nmi (0.93 km; 0.58 mi) to attack again.[14]

A U-boat shot to the surface 200 yd (180 m) ahead and a chase began; Walker tried to ram the U-boat but found that it could turn inside the turning circle of Stork nearly as fast. The ship fired on the U-boat and illuminated it with snowflakes, managed to ram it just forward of the conning tower and scraped over the hull of the submarine. As the U-boat emerged from under the stern, depth charges set for shallow were dropped and blew up U-574. The bows of Stork were crushed and bent sideways and the Asdic dome under the hull was smashed. Soon after, U-108 torpedoed the Ruckinge, which was abandoned and sunk later by Samphire. Focke-Wulf Condors arrived, one was shot down in another head-on attack and a second aircraft was damaged. When more Condors reached the convoy in the afternoon, a Martlet pilot made such a determined head-on attack, that he collided with the Condor and came back with its aerial round the tail-wheel; the night of 18/19 December was quiet.[14]

19–21 December[edit]

FAA Grumman Martlet (Ray Wagner Collection Photo (15468750313)

At 7:30 a.m., a Condor appeared to shadow the convoy and a Martlet chased it away before returning for lack of fuel. In the afternoon a Martlet spotted two U-boats and the convoy made an emergency turn. The U-boats were forced to submerge and Martlets patrolled overhead keeping them down until having to return when low on fuel. It was so dark that the aircraft were guided to the flight deck with hand torches and again the night was quiet.[14] On 21 December, 802 NAS could only keep three Martlets operational, take-off and landing was dangerous in the heavy swell and the pilots were very tired. After the last patrol, the commander of Audacity ordered the ship out of the convoy 10 nmi (19 km; 12 mi) to the starboard as usual but no escorts could be spared.[15] At 8:33 p.m. a ship at the rear of the convoy was torpedoed and nearby ships fired snowflakes, illuminating the area to both sides. Gerhard Bigalk in U-751 saw the silhouette of Audacity at close range and at 8:37 p.m. torpedoed Audacity which began to sink at the stern. Two more torpedoes from U-571 hit the escort carrier, a big explosion blew off the front end and the ship began to sink at the head.[16] Audacity sank head first at 10:10 p.m., 500 nmi (930 km; 580 mi) west of Cape Finisterre.[17]

22–23 December[edit]

Audacity is located in North Atlantic
Audacity
Audacity
Position of the Audacity when sunk

At 12:40 a.m. on the night of 21/22 December, U-567 (Endrass) was sunk by Deptford, two hours after gaining an Asdic contact. Following this Deptford collided with Stork, damaging them both.[18] During 22 December, U-71 and U-751 remained in contact, to be joined by U-125 (en route to America), while HG 76 was reinforced by the destroyers Vanquisher and Witch. At 10:54 a.m. a Consolidated Liberator of 120 Squadron, 19 Group Coastal Command based at RAF Nutts Corner in Ireland 750 miles (1,210 km) away, arrived over the convoy and saw off a Focke-Wulf Condor. After two hours the Liberator attacked a U-boat and at 4:20 p.m. was relieved by a second Liberator, which forced another three U-boats to submerge. The Liberator turned for home with minimal fuel but next day the convoy came into range of continuous air support.[10] On 23 December, Dönitz, shaken by the loss of five U-boats and the lack of success against the convoy, called off the attack and U-67, U-107, U-108 and U-751 returned to bases in France.[19]

Aftermath[edit]

Despite the loss of Audacity and the three other ships, the safe arrival of 30 ships and the destruction of three U-boats (U-127 was not included, and U-567 not confirmed until after the war) was judged to be an outstanding victory.[17] It also confirmed Walker as the Royal Navy’s foremost expert in anti-submarine warfare. The loss of five of the nine U-boats and Endrass, one of the most experienced U-boat commanders, was considered a grievous blow by Dönitz.[20][19]

Order of battle[edit]

Allied merchant ships[edit]

A total of 32 merchant vessels joined the convoy.[c][22]

Name Flag Tonnage (GRT) Notes
Adjutant (1922)  United Kingdom 1,931
Algerian (1924)  United Kingdom 2,315
Alresford (1922)  United Kingdom 2,472
Annavore (1921)  Norway 3,324 Sunk by U-567[23]
Baron Newlands (1928)  United Kingdom 3,386
Benwood (1910)  Norway 3,931
Blairatholl (1925)  United Kingdom 3,319
Cisneros (1926)  United Kingdom 1,886
Clan Macinnes (1920)  United Kingdom 4,672
Cressado (1913)  United Kingdom 1,228 Rear-Admiral Sir O H Dawson KBE
Disa (1918)  Sweden 2,002
Empire Darwin (1941)  United Kingdom 6,765 CAM ship
Fagersten (1921)  Norway 2,342
Finland (1939)  United Kingdom 1,375
Fylingdale (1924)  United Kingdom 3,918
Lago (1929)  Norway 2,552
Lisbeth (1922)  Norway 2,732
Meta (1930)  United Kingdom 1,575
Ocean Coast (1935)  United Kingdom 1,173
Ogmore Castle (1919)  United Kingdom 2,481
Ottinge (1940)  United Kingdom 2,870
Ousel (1922)  United Kingdom 1,533
Portsea (1938)  United Kingdom 1,583
Ruckinge (1939)  United Kingdom 2,869 Sunk by U-108[24]
San Gorg (1919)  United Kingdom 615
Sheaf Crown (1929)  United Kingdom 4,868
Shuna (1937)  United Kingdom 1,575
Spero (1922)  United Kingdom 1,589 Vice-Admiral Sir R Fitzmaurice KBE DSO (Commodore)
Switzerland (1922)  United Kingdom 1,291
Thyra (1925)  Sweden 1,796
Tintern Abbey (1939)  United Kingdom 2,471
Vanellus (1921)  United Kingdom 1,886

Convoy escorts[edit]

A series of armed military ships escorted the convoy at various times during its journey.[22]

Name Flag Type Joined Left
HMS Audacity (D10)  Royal Navy Escort carrier 14 Dec 1941 Sunk by U-751[25] on 21 Dec 1941
HMS Black Swan (L57)  Royal Navy Black Swan-class sloop 14 Dec 1941 16 Dec 1941
HMS Blankney (L30)  Royal Navy Hunt-class destroyer 14 Dec 1941 18 Dec 1941
HMS Campion (K108)  Royal Navy Flower-class corvette 15 Dec 1941 16 Dec 1941
HMS Carnation (K00)  Royal Navy Flower-class corvette 14 Dec 1941 15 Dec 1941
HMS Coltsfoot (K140)  Royal Navy Flower-class corvette 16 Dec 1941 16 Dec 1941
HMS Convolvulus (K45)  Royal Navy Flower-class corvette 14 Dec 1941 30 Dec 1941
HMS Deptford (U53)  Royal Navy Grimsby-class sloop 14 Dec 1941 Collided with HMS Stork on 22 Dec 1941
HMS Exmoor (L08)  Royal Navy Hunt-class destroyer 14 Dec 1941 18 Dec 1941
HMS Fowey (L15)  Royal Navy Shoreham-class sloop 14 Dec 1941 16 Dec 1941
HMS Gardenia (K99)  Royal Navy Flower-class corvette 14 Dec 1941 19 Dec 1941
HMS Hesperus (H57)  Royal Navy H-class destroyer 16 Dec 1941 16 Dec 1941
HMS Jonquil (K68)  Royal Navy Flower-class corvette 14 Dec 1941 30 Dec 1941
HMS La Malouine (K46)  Royal Navy Flower-class corvette 14 Dec 1941 16 Dec 1941
HMS Marigold (K87)  Royal Navy Flower-class corvette 14 Dec 1941 03 Dec 1941
HMS Penstemon (K61)  Royal Navy Flower-class corvette 14 Dec 1941 30 Dec 1941
HMS Samphire (K128)  Royal Navy Flower-class corvette 14 Dec 1941 30 Dec 1941
HMS Stanley (I73)  Royal Navy Clemson-class destroyer 14 Dec 1941 Sunk by U-574[26] on 19 Dec 1941
HMS Stork (L81)  Royal Navy Bittern-class sloop 14 Dec 1941 Collided with HMS Deptford on 22 Dec 1941
HMS Vanoc (H33)  Royal Navy V-class destroyer 23 Dec 1941 29 Dec 1941
HMS Vanquisher (D54)  Royal Navy V-class destroyer 23 Dec 1941 29 Dec 1941
HMS Vetch (K132)  Royal Navy Flower-class corvette 14 Dec 1941 30 Dec 1941
HMS Volunteer (D71)  Royal Navy Modified W-class destroyer 25 Dec 1941 29 Dec 1941
HMS Witch (D89)  Royal Navy Modified W-class destroyer 23 Dec 1941 29 Dec 1941

Axis losses[edit]

Axis submarines sunk
Date Number Type Captain Casualties Sunk by…
15 December 1941 U-127 IXC Korvettenkapitän Bruno Hansmann 51 HMAS Nestor
17 December 1941 U-131 IX Fregattenkapitän Arend Baumann[27] 0 HMS Stork
18 December 1941 U-434 VIIC Korvettenkapitän Wolfgang Heyda[28] 2 HMS Blankney,
HMS Stanley
19 December 1941 U-574 VIIC Kapitänleutnant Dietrich Gengelbach[29] 27 HMS Stork
21 December 1941 U-567 VIIC Kapitänleutnant Engelbert Endrass[30] 47 HMS Deptford

Notes[edit]

  1. ^ The fighters were usually split into standing patrols of two aircraft, which flew over the convoy for about two hours, searching for U-boats and Condors, the danger mainly coming from deck landings.[1]
  2. ^ If the British could break into naval Enigma, the position reports would be read.[6]
  3. ^ Data from Arnold Hague Convoy Database, unless specified.[21]

Footnotes[edit]

  1. ^ a b Forczyk 2010, p. 38.
  2. ^ a b c Terraine 1999, pp. 395–396.
  3. ^ a b Terraine 1999, p. 396.
  4. ^ a b Kaplan 2014, p. 120.
  5. ^ Sebag 2001, pp. 106–108.
  6. ^ Sebag 2001, p. 108.
  7. ^ Air 2001, p. 107.
  8. ^ Roskill 1957, pp. 354–355.
  9. ^ Terraine 1999, p. 725.
  10. ^ a b c Richards 1974, p. 351.
  11. ^ Roskill 1957, p. 478.
  12. ^ Terraine 1999, pp. 396–397.
  13. ^ a b c Kaplan 2014, p. 121.
  14. ^ a b c Terraine 1999, p. 398.
  15. ^ Kaplan 2014, p. 133.
  16. ^ Terraine 1999, pp. 398–399.
  17. ^ a b Roskill 1957, p. 479.
  18. ^ Kaplan 2014, p. 122.
  19. ^ a b Terraine 1999, p. 399.
  20. ^ Kaplan 2014, p. 123.
  21. ^ Hague 2013.
  22. ^ a b "Convoy Hg.76". Arnold Hague Convoy Database. Retrieved 18 October 2013. 
  23. ^ "Annavore - Norwegian Steam Merchant". Www.Uboat.Net. Retrieved 5 November 2013. 
  24. ^ "Ruckinge - British Steam Merchant". Www.Uboat.Net. Retrieved 5 November 2013. 
  25. ^ Helgason 2016.
  26. ^ "HMS Stanley (I73) - British Destroyer". Www.Uboat.Net. Retrieved 5 November 2013. 
  27. ^ "Fregattenkapitän Arend Baumann". www.uboat.net. Retrieved 5 November 2013. 
  28. ^ "Korvettenkapitän Wolfgang Heyda". www.uboat.net. Retrieved 5 November 2013. 
  29. ^ "Kapitänleutnant Dietrich Gengelbach". www.uboat.net. Retrieved 5 November 2013. 
  30. ^ "Kapitänleutnant Engelbert Endrass". www.uboat.net. Retrieved 5 November 2013. 

References[edit]

Further reading[edit]

  • Blair, Clay (2000) [1996]. Hitler’s U-boat War: The Hunters 1939–1942. I (Cassell ed.). New York: Random House. ISBN 978-0-304-35260-9. 
  • Hague, Arnold (2000). The Allied Convoy System 1939–1945: Its Organization, Defence and Operation. St. Catharines, Ont: Vanwell. ISBN 978-1-86176-147-7. 
  • Kemp, Paul (1997). U-boats Destroyed: German Submarine Losses in the World Wars. Annapolis, MD: Naval Institute Press. ISBN 978-1-85409-515-2. 
  • Rohwer, J.; Hümmelchen, G. (1992). Chronology of the War at Sea 1939–1945. Annapolis, MD: Naval Institute Press. ISBN 978-1-85409-515-2. 
  • Van der Vat, Dan (1988). The Atlantic Campaign: World War II's Great Struggle at Sea. New York: Harper & Row. ISBN 978-0-340-37751-2. 

External links[edit]