References
- May 1943 . May , Public Record Office, ADM. 223/98, Appreciation of Activities by F.W. 200 Aircraft from Bordeaux, February- Hereafter this archive will be cited as PRO
- The U-Boat War in the Atlantic, 1939–1945 104 Ministry of Defence (Navy), (London, 1989), Vol. III, p
- U-706, U-456, U-230, U-436, U-406, U-600, U-89, U-437, U-332, U-445, U-439, U-447, U-659.
- 27 April 1943 . 27 April , BdU War Diary
- 28 April 1943 . 28 April , BdU War Diary
- 29 April 1943 . 29 April , BdU War Diary, 28
- PRO, DEFE 3/718, intercepted 2145/1/5/43 decoded 1400/18/5/43.
- National Archives, Record Group 457, ‘German Navy/U-boat Message Translations & Summaries’, 2 Feb. 1941–9 July 1945, SRGN 001–49668, fos 16673, 16678. Hereafter this collection will be cited as SRGN.
- PRO, DEFE 3/718, intercepted 1530/2/5/43 decoded 2353/14/5/43.
- 2 May 1943 . 2 May , PRO, AIR 27/1913
- SRGN fo. 16728.
- PRO, DEFE 3/718, intercepted 0616/3/5/43 decoded 0138/15/5/43.
- SRGN fo. 16728.
- PRO, DEFE 3/718, intercepted 0917/3/5/43 decoded 0118/15/5/43.
- SRGN fo. 16785.
- PRO, DEFE 3/718, intercepted 1012/333/5/43 decoded 0125/15/5/43.
- SRGN fo. 16795
- SRGN fo. 16796.
- SRGN fo. 16808.
- PRO, DEFE 3/717, intercepted 1314/3/5/43 decoded 1525/5/5/43.
- SRGN fo. 16816.
- PRO, DEFE 3/717, intercepted 1729/3/5/43 decoded 2122/5/5/43.
- SRGN fo. 16827.
- SRGN fos 16834, 16835, 16836,16837, 16838, 16839.
- PRO, DEFE 3/717, intercepted 1909/3/5/43 decodedl527/5/5/43.
- SRGN fo. 16843.
- SRGN fo. 16848.
- SRGN fo. 16853.
- SRGN fos 16855, 16859, 16863, 16864, 16872.
- PRO, DEFE 3/717, intercepted 0231/4/5/43 decoded 1543/5/5/43.
- PRO, DEFE 3/717, intercepted 0255/4/5/43 decoded 1543/5/5/43.
- SRGN fo. 16889.
- U-Boat War 104 III, p
- SRGN fo. 16882.
- 67 PRO, AIR 41/48, p
- 4 May 1943 . 4 May , BdU War Diary, 3
- SRGN fo. 17075.
- U-607, U-456, U-230, U-436, U-406, U-600, U-89, U-445, U-447.
- SRGN fo. 16921.
- SRGN fo. 16977.
- Hinsley , F. H. 548 et al, British Intelligence in the Second World War (London, 1981), Vol. II, p
- E.g., PRO, DEFE 3/718, intercepted 0616/3/5/43 decoded 0138/15/5/43.
- PRO, DEFE 3/717, intercepted 1500/4/5/43 decoded 1155/5/5/43; intercepted 1939/4/5/43 decoded 1427/5/5/43.
- Dairy , War . 5 May 1943 . 5 May , Operations Division, German Naval Staff
- SRGN fo. 17092.
- SRGN fos 17104, 17113, 17123.
- SRGN fos 17111, 17151, 17172.
- SRGN fos 17144, 17160.
- 67 PRO, AIR 41/48, p
- E.g., PRO, DEFE 3/717, intercepted 1812/5/5/43 decoded 1613/9/5/43.
- U-607, U-456, U-230, U-436, U-89.
- 5 May 1943 . 5 May , BdU War Dairy
- SRGN fo. 17267.
- SRGN fo. 17280.
- SRGN fo. 17300.
- SRGN fo. 17323.
- SRGN fo. 17347.
- Black Swan, Campion, La Malouine, Stonecrop, Mallow, Myosotis, Shippigan, Il Fracomhe, Tadoussac, Jonquil
- High frequency direction finder.
- 14 May 1943 . 14 May , PRO, Adm. 199/964, The Senior Officer 37th Escort Group to Captain(D) Orrell Hey', Orrell Road, Liverpool
- SRGN fos 17356, 17363, 17366, 17371.
- SRGN fo. 17377.
- 7 May 1943 . 7 May , PRO, AIR 27/708
- PRO, DEFE 3/717, intercepted 1002/7/5/43 decoded 1337/9/5/43.
- SRGN fo. 17420.
- 14 May 1943 . 14 May , PRO, Adm. 199/964, The Senior Officer, 37th Escort Group to Captain(D) Orrell Hey', Orrell Road, Liverpool
- 7 May 1943 . 7 May , PRO, AIR 27/1184
- SRGN fo. 17419.
- SRGN fo. 17427.
- SRGN fo. 17441.
- SRGN fo. 17452.
- Starling, Kite, Wild Goose, Cygnet, Woodpecker.
- 10 May 1943 . Black Swan 10 May , PRO, Adm. 199/964, Commanding Officer, HMS to Captain(D) Orrell Hey', Orrell Road, Liverpool
- SRGN fo. 17456.
- 7 May 1943 . 7 May , BdU War Diary
- SRGN fo. 17592.
- Hinsley . British Intelligence 553 – 4 . II, pp. 631–8