British and Allied Submarine
Operations in World War II
Vice Admiral Sir Arthur Hezlet KBE CB DSO* DSC

 

 

     
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NOTES FOR CHAPTER III

1. This account of the meeting is, I believe, authentic. However it seems odd that Admiral Horton, with his knowledge of the Baltic should have made this statement. The ice was already melting in the Baltic and the route from Lulea to Germany was about to come into
use. The British minelaying therefore, however effective, would not have stopped the traffic in summer anyway. It seems more likely that Admiral Horton had correctly assessed the various intelligence reports and was convinced that the Germans intended to invade Norway in
any case.
2. In addition Porpoise was escorting a convoy to Norway and H33 was on anti U-boat patrol with a trawler on the west coast of Ireland.
3. Orzel to patrol off Lillesand, Sunfish to the north of the declared area, Unity and Sealion to the east of the declared area and Narwhal to lay mines as previously arranged in the Heligoland Bight.
4. Snapper to join Unity and Sealion east of the declared area sailing on 4th April. Truant and Seal to sail on 6th April. Spearfish and Seawolf to sail on 7th April. Sterlet to sail on 8th April.
5. Trident to Larvik, Sealion to the Kattegat, Sunfish to the east of the Skaw, Snapper to take Sealion’s place in the Heligoland Bight.
6. A 250 ton U-boat northbound on the surface. The weather was rough, the range 2000 yards and three torpedoes were fired.
7. 100 fighters, 400 bombers and 500 transport planes.
8. Shark, Severn, Tarpon, Clyde, Thistle and Ursula, Tarpon and Severn were half way up the east coast with a convoy.
9. Seal had not yet got to her patrol position north of the declared area in which she might have sighted the German ships and Truant had not reached her patrol position off Egersund. There were no other British submarines to the northward.
10. Sealion also sighted these ships but thought that they were neutrals.
11. Neutral ships always had their national flag painted on their sides and their name in large letters.
12. Remember she had not been told about the possibility of an invasion of Norway.

13. Her silhouette resembled that of Altmark and it was thought she must be a naval auxiliary in support of the breakout into the Atlantic believed to be in progress.
14. Trident did not report this sinking immediately.
15. The Germans thought that the torpedoes had been aimed at Lutzow.
16. The author, of course, realises that there was another alternative that was to gain air superiority by using a very strong carrier borne air force as the Americans later did in the Pacific.
17. This was a 90 degree angled shot.
18. Of the other ships, we have already followed the misfortunes of Karlsruhe and Lutzow. Blucher had been sunk entering Oslo Fjord by the coastal defences on 9th April. Konigsberg had been bombed and sunk in Bergen by Fleet Air Arm dive-bombers from the Orkneys (10th April). Emden was probably still in Oslo but she got back to Germany safely.
19. The name of this ship cannot be found in German records.
20. The Norwegian submarine B6 was still operating inside the leads protecting the southern approaches to Andaisnes.
21. She did not actually sink for seven hours.
22. Sterlet had in fact strayed into the Triad’s area and the Triad got caught up in the subsequent hunt as well.
23. The list of casualties in the Staff Monograph credits her with sinking a ship of 4000 tons but does not give its name.
24. Her gyrocompass was out of action.
25. The Germans now had nearly a hundred auxiliary anti-submarine vessels in commission.
26. L’Indomptable, Le Mallin and Le Triomphant.
27. The Captain and senior surviving officer were court martialled on their return from Germany in May 1945 and were acquitted.
28. It was thought at this time to be necessary to stop all machinery
when being hunted, to avoid making any noise that could be heard by the enemy’s hydrophones. The result was sometimes that control of the submarine was lost temporarily.
29. She too stopped all machinery and lost control diving to well over 350 feet.
30. Including one Polish and six French submarines.
31. Actually two may have been by anti-submarine vessels or may have struck mines.
32. Not all by submarines. The figures are for losses from all causes and for up to mid June

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