HMS Grethe Mortensen

‘A riddle wrapped in a mystery inside an enigma.’ So spoke Winston Churchill during a radio broadcast in October 1939, focusing on what the main actors would do next following the invasion of Poland. One of the key, and much-repeated, phrases that have come down to us from the Second World War, it could have been applied to many of the war’s subsequent events.

Prize of war

One of those events was the loss of HMS Grethe Mortensen, whose name suggests origins outside the Royal Navy. The first we hear of her in English records is as as the MFV Grethe Mortensen in prize case TS 13/1429 [1] taken by the King’s Proctor, a legal official acting for the Crown in the High Court of Admiralty (now HM Procurator-General and Treasury Solicitor). However, as the record has not yet been digitised, more details are only accessible by visiting the National Archives in person.

So little is known about her that one standard secondary wreck work states: ‘built as a large private steam yacht, this vessel was completed as a special service vessel in 1943. Was abandoned in a sinking condition after detonating a German-laid mine’, extrapolated from the bare-bones details available and accessible at the time of compilation, primarily from secondary sources. [1]

Nevertheless what we do learn from a brief glance at the Prize Court catalogue entry is that the three letters MFV demonstrate that she was a motor fishing vessel, so she was neither a private yacht nor steam-powered.

Prize cases are redolent of an earlier era, of privateering and sea battles during the Age of Sail in fact, but they occurred in both World Wars. When a ship is captured she becomes a prize of war: the capturing nation will interrogate the case according to prize rules, distribute any bounty to the capturing crew for the capture, and reassign the vessel in either their merchant navy or naval forces.

The key is that to all intents and purposes the Grethe Mortensen was an enemy vessel, and her name is distinctive enough for us to be sure we have the right vessel when we trace her in records. Names such as Two Sisters or Friends (in any language) are as difficult as Smith or Jones in genealogy!

A Danish ship

We can track her down in a Danish shipping register for 1944, wherein we can confirm that she was a 2-masted fishing vessel built of oak, beech and fir at Nordby in 1943, fitted with an engine developing 77HP, with a draught of 7.5ft, 40 tons gross, 14 tons net, and owned by H Mortensen of Esbjerg, Denmark. These details are confirmed by an official record of Danish losses in 1946, which include a retrospective record for Danish vessels lost during the war: according to that source, the loss was apparently not reported at Esbjerg until 16 January 1946. There was a war on, after all, and she was in a foreign service.

What we can now see is that she was small, and new, and we can also now confirm that she was definitely a motor fishing vessel, her original Danish nationality, and her service under the British flag. The official shipping statistics state her tonnage as 38 tons – close enough.

Why would Britain have regarded her as an enemy vessel? – because Denmark was under occupation by Nazi German forces from 1940. Grethe Mortensen was built in Denmark during the occupation years and thus was not a pre-existing vessel which had, for example, made her way to an Allied or neutral port on the fall of Denmark. Without sight of the prize case, which would no doubt shed light on the matter, we can only surmise that she was captured while out fishing, perhaps during a raid or after straying into English waters.

Transformation to Special Service Vessel

We turn now to British sources to see if we can discover a little more. We find out from an officially published list that Special Service Vessel, the requisitioned Grethe Mortensen, of 35 tons, built in 1943, was abandoned on 7 November 1944 in a sinking condition off North Foreland, Kent. [3] We know it is the right vessel – the name, the year of build, and the slightly variant tonnage again, this time 35, and it reconfirms her service under the British flag.

We can now see that she is classified among Royal Naval vessels and is a somewhat obscure ‘Special Service Vessel’, so she was on some form of war duty when she was lost. She is very small, and constructed of wood, so her role in that guise remains unclear.

What we can understand is that ‘Special Service Vessels’ is a label for ships that did not fit easily into any regular category of naval forces, and that during the Second World War a variety of ships of all shapes and sizes played a variety of roles.

We don’t really know exactly what she was doing, but from her position of loss – not in harbour in the role of harbour defence, like many small vessels, but offshore, located between the gateway to the English Channel at the Downs and the approaches to the Thames Estuary – we can surmise that she was probably in some sort of patrol role.

Danish sources shed very little light on the matter: ‘G.M. sailed in the British navy, and was lost in October 1944.’ is the terse one-liner in official loss records. [4]

Danish fishermen in Britain in WWII

She is mentioned again in passing in a 1961 article on Danish fishermen in Britain during the war, including the efforts of Danes living in Britain to raise money to build Spitfires. [5] Like the Belgians in Brixham (February 1943) Danes plied their fishing trade under the British flag at Fleetwood and Blackpool, fishing the cod-rich grounds off Iceland, and were ‘welcomed with open arms’.

It is said that four fishermen came over – their vessel sadly not named – in ‘quite an unusual way’: they rescued the crew of an American bomber which had crashed ‘into the drink’ (the English phrase is used!). The fishermen, with limited petrol for their engine, were going to make for home in Vestjylland (West Jutland) with the rescued crew. Instead the Americans persuaded them to set sail for England, helped along by a fair wind, and on arrival they were permitted to make use of British Danish-language radio channels to let their families know they were alive and in good health.

According to the article, two cutters from that Danish-British fleet were lost ‘during the war’, one being Grethe Mortensen of Esbjerg, 38 tons. It goes on to relate that she was taken over by the Royal Navy, and there were no Danes aboard when she was lost in October 1944.

It would appear from this article that Grethe Mortensen was part of the fishing fleet that had escaped and made its home in Britain, but voluntary action like this seems inconsistent with a Prize Court action. Curiouser and curiouser.

A July 1945 edition of the same source [6] has another virtually throwaway comment. It tells us that there is ‘sad news from England’ with a number of Danes drowned on a British-flagged fishing vessel on 21 April 1945, including a man from Esbjerg. He and that wreck form the focus of the article: we learn that he came over as first mate on either the Erling or Grethe Mortensen, both of Esbjerg, ‘which were taken over by the English on 14 May 1943’, which sounds both forcible and as if Grethe Mortensen had not spent very long at sea before this happened, given that 1943 was her year of build.

Her ‘circumstances’

Thus both British and Danish official and informal sources alike suggest that Grethe Mortensen was compulsorily taken over by the British under some obscure circumstance: she was more than requisitioned, she was the subject of a Prize Court action. So was the Erling. So there was definitely something about their ‘circumstances’. [7]

I have written frequently about wartime censorship, but it struck me that this might have made a newsworthy story even if published some time after the event (weeks or months). It had all the right ingredients for a snippet that contained a modicum of good news after four years of war.

We read on 11 September 1943 that: ‘Six Danish fishing vessels arrived last week in a British port, having been intercepted in the North Sea by British naval units . . . The boats set out from Esbjerg when Denmark was in a state of extreme tension . . . Each ship had a good catch of prime North Sea plaice, which was landed and sold.’

The article ends: ‘Approximately one third of the boats [two, then!] will be available again for fishing, and the older men, including the skippers, will man them. The younger men will go into the forces here . . . ‘ [8]

This does sound like a ‘capture’ and it hints that the fate of the other four boats was intended to be in some other capacity to be assigned but not publicised. Further, like the Erling and the Grethe Mortensen, they came from Esbjerg. We lack any confirmatory detail, as we would expect under the conditions of wartime journalism, but this seems that this might refer to the incident that led to the portals of the Prize Court.

What was her fate?

What happened to Grethe Mortensen on the day she was lost in November 1944, however, is less clear. As we have been able to demolish any assertion in a key secondary source that she was originally a steam-powered private yacht that was completed at the builder’s as a ‘special service vessel’, and as none of the other sources mention loss to war causes, any suggestion originating from the same secondary source that she was lost to a mine may also be unlikely.

Looking at the weather for 7 November 1944 in Met Office records [9], there does not seem to be anything particularly unusual about the meteorological conditions that day either: predominantly westerly, wind forces approximately 3-6. As we have shown before, however, vessels can be lost in similar conditions if they are unlucky enough, and the one clue we may have is that observations at 6-hourly intervals show the wind alternately veering and backing a couple of points either way. Perhaps that was enough for a small vessel to spring a leak or take on water and be overwhelmed by the sea.

It’s also interesting that Danish sources consistently report the vessel as lost in October, rather than November, but that information appears to be second-hand. On the other hand, dates in British Vessels Lost at Sea tend to be reliable, so I suspect that 7 November at least is accurate. It is difficult to know whether the date of capture in early September 1943 is reliable (‘last week’ could hide a multitude of sins if you wanted to be vague and escape the censor’s pencil) but I suspect it is, because reference is made to the Danish general strike or ‘August Uprising’ of August 1943. It would also seem more plausible for the date of capture than 14 May 1943 for a vessel recorded as newly built that same year.

At the moment we appear to be no further forward with the wreck event beyond this sparse detail, but at least we have been able to put some flesh on the bare bones of the vessel herself, and understand better what she actually was – even if the mechanism by which she became a Special Service Vessel, what she was doing at the time of loss, and the circumstances of the loss itself, all combine to form ‘a riddle wrapped in a mystery inside an enigma’ that is only partially unravelled.

Footnotes

[1] Larn R & Larn B, 1995 Shipwreck Index of the British Isles: Vol 2, Hampshire, Isle of Wight, Sussex, Kent (Mainland), Kent (Downs), Kent (Goodwin Sands), Thames (London: Lloyds of London)

[2] Prize Case for the MFV Grethe Mortensen, TS 13/1429, 1943-1946, The National Archives, Kew

[3] HMSO, 1947 British Vessels Lost at Sea 1939-1945 [London: HMSO]

[4] Ministeriet for Handel, Industri og Søfart, 1948 Dansk Søulykke-Statistik 1946 (Copenhagen: Det Kongelige Søkort-Arkiv) (in Danish)

[5] Tidsskrift for Redningsvæsen: Medlemsblad for Foreningen af danske Redningsmænd (Journal of the Rescue Services: Members’ magazine for the Association of Danish Lifeboatmen), Vol. 28, No.1, January 1961 (in Danish)

[6] Tidsskrift for Redningsvæsen: Medlemsblad for Foreningen af danske Redningsmænd (Journal of the Rescue Services: Members’ magazine for the Association of Danish Lifeboatmen), Vol. 12, No.7, July 1945 (in Danish)

[7] Prize Case for the MFV Erling, TS 13/1293, 1943-1946, The National Archives, Kew

[8] Hull Daily Mail, Saturday 11 September, 1943, No.18,048, p1 (British Newspaper Archive online)

[9] Meteorological Office, 1944, Daily Weather Report 7 November 1944 DWR 1944.11 Met Office Digital Library and Archive