Allied Warships

HMS Mermaid (U 30)

Sloop of the Modified Black Swan class

NavyThe Royal Navy
ClassModified Black Swan 
PennantU 30 
Built byWilliam Denny & Brothers (Dumbarton, Scotland) 
Ordered11 Feb 1942 
Laid down8 Sep 1942 
Launched11 Nov 1943 
Commissioned12 May 1944 
End service 

Sold to the West German Navy on 5 May 1959.
Scrapped in 1990.


Commands listed for HMS Mermaid (U 30)

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and that we only list Commanding Officers for the duration of the Second World War.

1Lt.Cdr. John Pemberton Mosse, RN2 Apr 1944Sep 1945
2Lt.Cdr. John Townshend Kimpton, DSC, RNSep 1945

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Notable events involving Mermaid include:

30 May 1944
HMS H 50 (T/Lt. A.F. Wicker, RNVR) conducted A/S exercises off Campbeltown with HMS Mermaid (Lt.Cdr. J.P. Mosse, RN) and HMS Radiant (T/Lt. C.S.R. Shapland, RNVR). (1)

18 Jun 1944
HMS Varangian (Lt. G.J. Glennie, RANVR) conducted A/S exercises off Tobermory with HMS Mermaid (Lt.Cdr. J.P. Mosse, RN). (2)

19 Jun 1944
HMS Varangian (Lt. G.J. Glennie, RANVR) conducted A/S exercises off Tobermory with HMS Mermaid (Lt.Cdr. J.P. Mosse, RN). (2)

21 Jun 1944
HMS Unrivalled (Lt. D.S. Brown, RNVR) conducted exercises off Tobermory with HMS Pevensey Castle (A/Lt.Cdr. C.W. Leadbetter, RNR) and HMS Mermaid (Lt.Cdr. J.P. Mosse, RN). (3)

22 Jun 1944
HMS Unrivalled (Lt. D.S. Brown, RNVR) conducted exercises off Tobermory with HMS Pevensey Castle (A/Lt.Cdr. C.W. Leadbetter, RNR) and HMS Mermaid (Lt.Cdr. J.P. Mosse, RN). (3)

30 Jun 1944
HMS Trusty (Lt. L.E. Herrick, DSO, RN) conducts attack exercises off Scapa Flow for the Commanding Officer Qualifying Course with HMS Devonshire (Capt. D.K. Bain, DSO, RN, flying the flag of Rear-Admiral R.R. McGrigor, CB, DSO, RN).

Besides the exercises with the submarine HMS Devonshire also made full power runs on the measured mile as well as a rangefinding and inclination (RIX) exercise during which HMS Mermaid (Lt.Cdr. J.P. Mosse, RN) acted as target. (4)

6 Jul 1944
HMS Shakespeare (Lt. D. Swanston, DSC and Bar, RN) conducted A/S exercises with HMS Mermaid (Lt.Cdr. J.P. Mosse, RN), HMS Hamlet (T/Lt. J.C. Boyd, RNVR) and HMS Graemsay (A/Skr.Lt. A.R. Lewis, RNR). (5)

15 Aug 1944

Operation Victual passage of convoys JW 59 and RA 59A between the U.K. and Northern Russia vice versa, and Operation Goodwood, to provide cover for these convoys and to attack the German battleship Tirpitz in the Kaafjord.

Operation Victual.

Convoy JW 59.

This convoy departed Loch Ewe on 15 August 1944 for Northern Russia.

It was made up of the following merchant vessels; British Promise (British (tanker), 8443 GRT, built 1942), Charles A. McAllister (American, 7176 GRT, built 1943), Charles Dauray (American, 7176 GRT, built 1944), Clark Howell (American, 7198 GRT, built 1944), David B. Johnson (American, 7198 GRT, built 1944), Edward H. Crockett (American, 7176 GRT, built 1944), Edward L. Grant (American, 7176 GRT, built 1943), Elijah Kellogg (American, 7176 GRT, built 1944), Empire Buttress (British (crane ship), 2905 GRT, built 1943), F.T. Freylingh Uysen (American, 7176 GRT, built 1943), Fort Glenora (British, 7126 GRT, built 1943), Frank Gilbreth (American, 7176 GRT, built 1944), Herbrand (Norwegian (tanker), 9108 GRT, built 1935), John La Farge (American, 7176 GRT, built 1943), Jose Marti (American, 7176 GRT, built 1943), Josephine Shaw Lowell (American, 7176 GRT, built 1944), Leo J. Duster (American, 7176 GRT, built 1943), Luculus (British (tanker), 6546 GRT, built 1929), Nacella (British (tanker), 8196 GRT, built 1943), Oakley Wood (American, 7210 GRT, built 1944), Samannan (British, 7219 GRT, built 1944), Samcalia (British, 7219 GRT, built 1943), Samconstant (British, 7219 GRT, built 1944), Samgara (British, 7219 GRT, built 1943), Samidway (British, 7219 GRT, built 1943), Samloyal (British, 7210 GRT, built 1944), Samlyth (British, 7210 GRT, built 1944), Samsuva (British, 7219 GRT, built 1944), Samtredy (British, 7219 GRT, built 1943), Silas Weir Mitchell (American, GRT, built 1943), Thomas Donaldson (American, 7210 GRT, built 1944), Thomas H. Sumner (American, 7176 GRT, built 1944) and Warren Delano (American, 7210 GRT, built 1944).

The rescue ship Rathlin (British, 1600 GRT, built 1936) was also with the convoy.

Also with the convoy were eleven Russian patrol vessels / submarine chasers, these were BO-213 (former SC-1484), BO-214 (former SC-1480), BO-215 (former SC-1496), BO-216 (former SC-1488), BO-218 (former SC-1492), BO-219 (former SC-1475), BO-220 (former SC-1490), BO-221 (former SC-1481), BO-222 (former SC-1498), BO-223 (former SC-1476) and BO-224 (former SC-1507).

On departure from Loch Ewe the convoy was escorted by the destroyers HMS Keppel (Cdr. I.J. Tyson, DSO, DSC, RNR), HMS Whitehall (Lt.Cdr. P.J. Cowell, DSC, RN), sloops HMS Cygnet (Cdr. A.H. Thorold, DSC, OBE, RN, Senior Officer), HMS Kite (Lt.Cdr. A.N.G. Campbell, RN), HMS Mermaid (Lt.Cdr. J.P. Mosse, RN), HMS Peacock (Lt.Cdr. R.B. Stannard, VC, DSO, RNR), frigate HMS Loch Dunvegan (Cdr. E. Wheeler, RD, RNR) and the corvettes HMS Bluebell (Lt. G.H. Walker, DSC, RNVR), HMS Camellia (T/Lt. G.W. Charlton, DSC, RNR), HMS Honeysuckle (T/Lt. J.A. Wright, RNR), HMS Oxlip (T/Lt. J.K. Craig, RNVR) and HMS Charlock (T/Lt. J.E.B. Healy, RNVR).

On the 16th the escort carriers HMS Vindex (Capt. H.T.T. Bayliss, RN, flying the flag of flying the flag of Vice-Admiral F.H.G. Dalrymple-Hamilton, CB, RN), HMS Striker (Capt. W.P. Carne, RN), light cruiser HMS Jamaica (Capt. J. Hugh-Hallett, DSO, RN) and the destroyers Wrangler (Lt.Cdr. D.W. Austin, RN), Whirlwind (Cdr. W.A.F. Hawkins, DSO, DSC, OBE, RN), HMS Verulam (Lt.Cdr. W.S. Thomas, DSC, RN), HMS Virago (Lt.Cdr. A.J.R. White, RN), HMS Volage (Cdr. L.G. Durlacher, OBE, RN), HMCS Algonquin (Lt.Cdr. D.W. Piers, DSC, RCN) and HMS Scourge (Lt.Cdr. G.I.M. Balfour, RN) departed Scapa Flow. The destroyers were to proceed to Skaalefjord. They were detached around 0930B/17, when the other ships joined the convoy. The destroyers arrived at Skaalefjord later that day. They were replaced by the destroyers HMS Milne (Capt. M. Richmond, DSO, OBE, RN), HMS Marne (Lt.Cdr. P.A.R. Withers, DSO, RN), HMS Meteor (Lt.Cdr. D.J.B. Jewitt, RN), HMS Musketeer (Cdr. R.L. Fisher, OBE, DSC, RN) and HMS Caprice (Lt.Cdr. G.W. McKendrick, RN) which had departed Skaalefjord earlier on the 17th.

On 17 August 1944, the Russian battleship Archangelsk departed Scapa Flow to first rendezvous with eight Russian destroyers coming from Skaalefjord and then join the convoy. On departure from Scapa Flow the Archangelsk was escorted by the British destroyers HMS Scorpion (Cdr. W.S. Clouston, DSC, RN), HMS Serapis (Lt.Cdr. E.L. Jones, DSC, RN) and HMS Cambrian (Lt.Cdr. H.T. Harrel, RN).

On the 18th the Russian destroyers Derzkij, Dejatelnyj, Doblestnyj, Dostojnyj, Zarkij, Zguchij, Zivuchij and Zostkij, departed Skaalefjord to make rendezvous with the Archangelsk in position 62°20'N, 05°30'W. They were brought out to the rendezvous by the British destroyer HMS Cassandra (Cdr. P.F. Powlett, DSO and Bar, DSC, RN) which parted company on the Russian destroyers joining the Russian battleship. The three British destroyers that had brought out the Russian battleship from Scapa Flow then proceeded to Skaalefjord to fuel.

At 2250B/20, the Archangelsk and the eight Russian destroyers joined the convoy.

Several German U-boats attacked the convoy during its passage. The only success was, U-344 which sank the sloop Kite with two FAT torpedoes (out of three fired) on 21 August. U-344 was sunk the next day by a Swordfish from HMS Vindex and U-354 was sunk on 24 August by HMS Mermaid and HMS Loch Dunvegan.

The convoy arrived in the Kola Inlet on 25 August.


Convoy RA 59A.

This convoy departed the Kola Inlet on 28 August 1944 for the U.K.

It was made up of the following merchant vessels; Barbara Frietchie (American, 7176 GRT, built 1943), Empire Bard (British, 3114 GRT, built 1942), Empire Elgar (British, 2847 GRT, built 1942), Empire Prowess (British, 7058 GRT, built 1943), Fort Verscheres (British, 7128 GRT, built 1942), Herbrand (Norwegian (tanker), 9108 GRT, built 1935), Lacklan (British (tanker), 8670 GRT, built 1929), Luculus (British (tanker), 6546 GRT, built 1929) and W.R. Grace (American, 7176 GRT, built 1943).

On departure from the Kola Inlet the convoy was escorted by the escort carriers HMS Vindex, HMS Striker, light cruiser HMS Jamaica, destroyers HMS Milne, HMS Marne, HMS Meteor, HMS Musketeer, HMS Caprice, HMS Keppel, HMS Whitehall, sloops HMS Cygnet, HMS Mermaid, HMS Peacock, frigate HMS Loch Dunvegan and the corvettes HMS Bluebell, HMS Camellia, HMS Charlock, HMS Honeysuckle and HMS Oxlip.

On 2 September 1944, a Swordfish aircraft from HMS Vindex attacked the German U-boat U-394. The German submarine was the sunk by HMS Keppel, HMS Whitehall, HMS Mermaid and HMS Peacock.

The convoy arrived at Loch Ewe on 5 September 1944.

HMS Vindex, HMS Striker, HMS Jamaica, HMS Milne, HMS Marne, HMS Meteor, HMS Musketeer, HMS Caprice arrived at Scapa Flow in the afternoon of 5 September 1944 after having been detached from the convoy around 0200B/5.


Opertion Goodwood.

The object of this operation was to inflict sufficient damage on the German battleship Tirpitz and to put her out of action for the remainder of the war and to provide cover for the passage of convoys JW 59 and RA 59A against attack by the Tirpitz in case the air attacks on the Tirpitz failed to put her out of action. For the operation ' Force 1 ', made up of the battleship HMS Duke of York (Capt. G.H.E. Russell, RN, flying the flag of Vice-Admiral H.R. Moore, KCB, CVO, DSO, RN), aircraft carriers HMS Indefatigable (Capt. Q.D. Graham, CBE, DSO, RN, flying the flag of Rear-Admiral R.R. McGrigor, CB, DSO, RN), HMS Formidable (Capt. P. Ruck-Keene, CBE, RN), HMS Furious (Capt. G.T. Philip, DSO, DSC, RN), heavy cruisers HMS Berwick (Capt. S.H.T. Arliss, DSO, RN), HMS Devonshire (Capt. D.K. Bain, DSO, RN) and the destroyers HMS Myngs (Capt. M.L. Power, CBE, RN), HMS Zambesi (Lt.Cdr. W. Scott, DSC and Bar, RN), HMS Kempenfelt (Capt. E.G. McGregor, DSO, RN), HMS Vigilant (Lt.Cdr. L.W.L. Argles, RN), HMCS Sioux (A/Lt.Cdr. E.E.G. Boak, RCN) and HNoMS Stord (Lt.Cdr. H. Øi) departed Scapa Flow on the 18th.

' Force 1 ' sailed in company with ' Force 2 ', which was made up of the escort carriers HMS Trumpeter (A/Capt. K.S. Colquhoun, RN), HMS Nabob (Cdr. H.N. Lay, OBE, RCN), heavy cruiser HMS Kent (Capt. G.A.B. Hawkins, DSC, MVO, RN), and the frigates HMS Aylmer (Lt. A.D.P. Campbell, RN), HMS Bickerton (Cdr. D.G.F.W. MacIntyre, DSO and 2 Bars, RN), HMS Bligh (A/Lt.Cdr. J.W. Cooper, RNR), HMS Keats (T/A/Lt.Cdr. N.F. Israel, RNR) and HMS Kempthorne (Lt.Cdr. A. Brown, RD, RNR).

Also on the 18th, a tanker force, ' Force 9 ' departed Scapa Flow. It was made up of the RFA tankers Black Ranger (3417 GRT, built 1941) and Blue Ranger (3417 GRT, built 1941). They were escorted by the corvettes HMS Dianella (T/Lt. J.F. Tognola, RNR), HMS Poppy (T/Lt. D.R.C. Onslow, RNR) and HMS Starwort (T/A/Lt.Cdr. M.F. Villiers-Stuart, RNVR).

Around 1900B/18, the destroyer HMS Cassandra joined company having first escorted eight Russian destroyers to their rendezvous (see above).

At 0800B/19, HMS Kempenfelt, HMS Zambesi and HMS Cassandra were detached to return to Scapa Flow.

Also on the 19th the destroyers HMS Scorpion, HMS Scourge, HMS Serapis, HMS Verulam, HMS Virago, HMS Volage, HMCS Algonquin, HMS Whirlwind, HMS Wrangler and HMS Cambrian joined ' Force 1 '.

On 20 August the weather was found unsuitable to attack the Tirpitz.

On 21 August the destroyer HMS Nubian (Lt.Cdr. T.A. Pack-Beresford, RN) and frigate HMS Grindall (Cdr. W. Cole, RD, RNR) departed Scapa Flow to join ' Force 9 '.

On 22 August another attempt was made to attack the Tirpitz. 32 Barracudas, 24 Corsairs, 11 Fireflies, 9 Hellcats and 8 Seafires took off from the three fleet carriers. During the attacks Tirpitz was not hit. Four German BV-138, one He-115 and two Ar-196 were destroyed. The German submarine U-965 had just left Hammerfest when she was attacked by aircraft from HMS Indomitable. She sustained three dead and eight wounded among her crew and returned to Hammerfest shortly after having sailed. Three British aircraft were lost. Part of ' Force 1 ' then proceeded to a rendezvous with ' Force 9 ' to fuel.

Also on the 22nd, the German submarine U-354 managed to hit and damage HMS Nabob with a FAT torpedo. A T-5 (Gnat) torpedo was then fired to finish off the stricken ship but it hit the frigate HMS Bickerton. The stricken frigate was beyond salvage and was later scuttled by a torpedo from HMS Vigilant. The damaged HMS Nabob was escorted back to Scapa Flow arriving on 27 August together with HMS Trumpeter. On arrival at Scapa Flow they were escorted by the destroyers HMS Kempenfelt, HMS Cassandra, HMS Zest (Lt.Cdr. R.B.N. Hicks, DSO, RN), HMS Venus (Cdr. J.S.M. Richardson DSO, RN) and the frigate HMS Kempthorne. These four destroyers had departed Scapa Flow to rendezvous with the escort carriers and take over escort from the frigates HMS Aylmer, HMS Bligh and HMS Keats which arrived at the Faeroer Islands on the 27th.

On the 24th another air strike was flown off. 33 Barracudas, 24 Corsairs, 10 Hellcats, 10 Fireflies and 8 Seafires were flown off from the fleet carriers but further to the south then the previous attack so as to archive surprise by approaching undetected. This however failed and by the time the actual attack on the Tirpitz started she was completely obscured by smoke the Tirpitz. Two hits were obtained but one bomb did not explode. Also other targets were attacked and some damage was done. Six British aircraft were lost in the attack.

On 26 August part of ' Force 1 ', HMS Duke of York, HMS Devonshire, HMS Myngs, HMCS Algonquin, HMCS Sioux, HMS Scorpion, HNoMS Stord arrived at Thorshavn, Faeroer Islands to fuel. They departed to resume operations on the 27th. HMS Furious and HMS Serapis also arrived at Thorshavn on the 26th but did not departed again. They proceeded from Thorshavn to Scapa Flow on the 28th. They had been joined by the frigates HMS Aylmer, HMS Bligh and HMS Keats.

Also on the 26th, HMS Berwick and HMS Kent were detached to Scapa Flow where they arrived on the 28th.

Also on the 26th, HMS Whirlwind arrived at Scapa Flow having been detached earlier due to engine defects.

Another air attack was carried out on the 29th. 26 Barracudas, 17 Corsairs, 10 Fireflies, 7 Hellcats and 7 Seafires were flown off. Again the Tirpitz was completely covered in smoke. No direct hits were obtained on the battleship but some splinter damage was done. The 7 Seafires claimed results during an attack on Hammerfest. Two British aircraft were shot down by enemy AA fire.

HMS Indefatigable, escorted by HMS Scorpion, HMCS Algonquin and HMS Wrangler, were detached on the 29th and HMS Formidable, escorted by HNoMS Stord and HMS Volage on the 30th. HMS Indefatigable and her three escorting destroyers arrived at Scapa Flow at 0730B/1, HMS Formidable her her two escorting destroyers arrived at Scapa Flow at 0830B/2.

HMS Duke of York, HMS Devonshire, HMS Myngs, HMS Vigilant, HMS Virago, HMCS Sioux, HMS Cambrian and HMS Scourge arrived at Scapa Flow at 0700B/3. (6)

24 Aug 1944
German U-boat U-354 was sunk in the Barents Sea north-east of North Cape, in position 72°49'N, 30°41'E, by depth charges from the British sloop HMS Mermaid (Lt.Cdr. J.P. Mosse, RN) and the British frigate HMS Loch Dunvegan (Cdr. E. Wheeler, RD, RNR).

2 Sep 1944
German U-boat U-394 was sunk in the Norwegian Sea some nautical miles south-east of Jan Mayen island, Norway, in position 69°47'N, 04°10'E, by rockets and depth charges from a Swordfish aircraft (Sqdn. 825) from the British escort carrier HMS Vindex (Capt. H.T.T. Bayliss, RN), and the British destroyers HMS Keppel (Cdr. I.J. Tyson, DSO, DSC, RNR) and HMS Whitehall (Lt.Cdr. P.J. Cowell, DSC, RN) and the British sloops HMS Mermaid (Lt.Cdr. J.P. Mosse, RN) and HMS Peacock (Lt.Cdr. R.B. Stannard, VC, DSO, RNR).


  1. ADM 173/18528
  2. ADM 173/19351
  3. ADM 173/19224
  4. ADM 53/119251 + ADM 173/19126
  5. ADM 173/18719
  6. ADM 199/1427

ADM numbers indicate documents at the British National Archives at Kew, London.

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