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  Piece

  Includes German Naval report of damage to GNEISENAU during air-raid April 14,

  Includes German Naval report of damage to GNEISENAU during air-raid April 14,

  Held by

  The National Archives, Kew

  Date

  July 28 1941-Aug 5 1941

  Reference

  HW 5/25

• Catalogue level

  Item

  Relations with Y Stations. Notes on the relationship between Naval Section and the...

  Relations with Y Stations. Notes on the relationship between Naval Section and the intercept ('Y') stations providing the essential raw material from which intelligence was obtained by decryption and analysis. The main stations in the UK were Scarbor…

  Held by

  The National Archives, Kew

  Date

  1941 Aug 21 - 1944 Apr 28

  Reference

  HW 50/15/3

• Catalogue level

  Piece

  Teleprinted translations of decrypted Second World War German U-boat (or U-boat command)...

  Subject: U-boat group/Ubootgruppe Hela (1943 Dec 28 - 1944 Jan 1).Subject: U-boat group/Ubootgruppe Rügen (Ruegen, Pt 2) (1944 Jan 15 - 1944 Jan 26).

  Held by

  The National Archives, Kew

  Date

  1943 Dec 1-1944 Feb 3

  Reference

  HW 18/271

• Catalogue level

  Piece

  Gp Capt Jones' draft letter from EWT to Gen McDonald of USSTAFE Feb 19 requesting...

  King of Feb 19, EWT to Kenworthy Feb 26 with draft order on Knockholt organisation and Knockholt family tree and channels of communication between BP and Knockholt, AD 2 to EWT Feb 27 re previous week's Knockholt printer output, Kenworthy to EWT Feb …

  Held by

  The National Archives, Kew

  Date

  1945 Feb 16-28

  Reference

  HW 14/122

• Catalogue level

  Piece

  The Japanese Minor General Purpose System (J.N.20) by Mr A.R. Davis. An account of...

  The Japanese Minor General Purpose System (J.N.20) by Mr A.R. Davis.An account of work on the Japanese Navy general purpose cypher system, used by stations which did not hold or preferred not to use the main naval code, J.N.25.

  Held by

  The National Archives, Kew

  Date

  1940 Jun 01-1945 Jul 31

  Reference

  HW 8/64

• Catalogue level

  Piece

  Teleprinted translations of decrypted Second World War German U-boat (or U-boat command)...

  Subject: Rhakotis, blockade runner (1942 Dec 28 - 1943 Jan 3).Subject: U-boat group/Ubootgruppe New Westwall (Pt 2) (1942 Dec 22).Subject: U-boat group/Ubootgruppe Falke (1942 Dec 28 - 1943 Jan 18).

  Held by

  The National Archives, Kew

  Date

  1942 Nov 1-1944 Jan 26

  Reference

  HW 18/252

• Catalogue level

  Piece

  Teleprinted translations of decrypted Second World War German U-boat (or U-boat command)...

  Subject: U-boat type XXIII (1944 Oct 17 - 1945 Apr 28). Subject: U-boat type XXVI (1945 Feb - 1945 Mar 18).

  Held by

  The National Archives, Kew

  Date

  1944 Oct 2-1945 May 12

  Reference

  HW 18/286

• Catalogue level

  Piece

  Decrypts of Japanese army and army air force messages

  Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1944 Dec 24-1945 Feb 28

  Reference

  HW 41/177

• Catalogue level

  Piece

  EWT to C Sept 1 reporting cypher change by GP from double Playfair to Raster stencil...

  HQ to EWT Sept 2 appreciating release of certain PO operators both now and at end of war; MI-8 to EWT Sept 5 re policy on ATS operators; DD 1 to C Sept 14 reobscene language about Hitler exchanged between German Army in South Ukraine and Berlin Aug 2…

  Held by

  The National Archives, Kew

  Date

  1944 Sept 1-15

  Reference

  HW 14/111

• Catalogue level

  Piece

  North Africa: GAF summary of operations of Oct 26, Allied attack area west of Alamein;...

  North Africa: GAF operational report; air protection for Luisiana convoy leaving Navarino Oct 28 for Benghazi; Italian destroyers Geniere, Aviere and Legionario to leave Taranto carrying fuel for Tobruk, Oct 30; air transport available to carry

  Held by

  The National Archives, Kew

  Date

  1942 Oct 27

  Reference

  HW 1/1015

• Catalogue level

  Piece

  Traffic analysis report on Japanese army communications

  Traffic analysis report on Japanese army communications

  Held by

  The National Archives, Kew

  Date

  1945 Aug 20 - 1945 Aug 28

  Reference

  HW 41/328

• Catalogue level

  Piece

  India 'Y' 1938-1941 Notes by Lt Col Dagg. Notes on the army Sigint organisation in...

  India 'Y' 1938-1941 Notes by Lt Col Dagg. Notes on the army Sigint organisation in India

  Held by

  The National Archives, Kew

  Date

  1938 Jan 01 - 1941 Feb 28

  Reference

  HW 50/26

• Catalogue level

  Piece

  Sigint Board, Jan - June 1945 - minutes of meetings and other papers Subjects discussed...

  Sigint Board, Jan - June 1945 - minutes of meetings and other papersSubjects discussed include: Sigint liaison with French and Dutch compilation of historical records review of Signal Intelligence personnel and tasks noise investigation in South East…

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01-1945 Jun 28

  Reference

  HW 42/14

• Catalogue level

  Piece

  Teleprinted translations of decrypted Second World War German U-boat (or U-boat command)...

  Subject: U-boat group/Ubootgruppe Mitte (Pt 1, northern waters/Nordmeer) (1944 Mar 14 - 1944 Sep 28).Subject: FuMO (Fu.M.O., Funkmeßortungsgerät, radar) (1944 Mar 13 - 1945 Apr 28).

  Held by

  The National Archives, Kew

  Date

  1944 Feb 18-1945 Apr 28

  Reference

  HW 18/275

• Catalogue level

  Piece

  Teleprinted translations of decrypted Second World War German U-boat (or U-boat command)...

  Subject: technical subjects (torpedoes, Aphrodite, ...) (1942 Feb 28 - 1942 Sep 16).Subject: Heligoland (1942 Mar 1 - 1942 Mar 2).Subject: U-boat group/Ubootgruppe Umhang (1942 Mar 5 - 1942 Mar 27).

  Held by

  The National Archives, Kew

  Date

  1942 Jan 30-1943 Sep 16

  Reference

  HW 18/247

• Catalogue level

  Piece

  North Africa: Hitler orders all available fighting personnel and weapons of all branches...

  forces in Africa were immediately to be employed at front, Nov 29, Panzer Army anxious to know how many GAF and naval personnel could be freed; Allied air raid on Tripoli, many vessels damaged or sunk, Nov 29, supply programme for Germans as at Nov 2…

  Held by

  The National Archives, Kew

  Date

  1942 Nov 30

  Reference

  HW 1/1176

• Catalogue level

  Piece

  M/S note from FL Lucas to EWT Mar 16 on threat of German attacks on British airfields...

  Winterbotham to Wallace Mar 25, Gordon to be in UK Mar 27, only 2 of 4 damaged sets need replacing; Brown to DD 1 Mar 22 re proposed moves of 1 SIC elements, exchanges between Brown and Lt Col Gadd at BP on forward deployment of Sigint elements Mar 2…

  Held by

  The National Archives, Kew

  Date

  1945 Mar 16-31

  Reference

  HW 14/124

• Catalogue level

  Piece

  J1624/T28 to DNI (see 1283). Mediterranean: two GAF anti-shipping units transfer...

  Japanese minister, Madrid: Spanish internal situation and views on war, Oct 28. Turkish minister, Madrid: situation in Finland, Denmark and Sweden, Oct 30.

  Held by

  The National Archives, Kew

  Date

  1942 Nov 4

  Reference

  HW 1/1044

• Catalogue level

  Piece

  3001-5000: 3020: Inquires concerning relations of Lore WOLK (Probable alias Irma...

  3001-5000: 3020: Inquires concerning relations of Lore WOLK (Probable alias Irma or Rosa Wolf) with English agents. 3023: Jewish Commissar BELEV. 3242: Jew FAJONOFF/FAJONOUF 3392: Jews and the Arabs. 3574: IRSAY HOLENBERG GEROE affair; show whether …

  Held by

  The National Archives, Kew

  Date

  1943 Jan 08-1943 Jul 28

  Reference

  HW 19/236

• Catalogue level

  Piece

  North Africa: Rommel's reply Nov 26 to Cavallero's request for a detailed investigation...

  North Africa: Rommel's reply Nov 26 to Cavallero's request for a detailed investigation into withdrawal of Italian infantry if Allies break through at Marsa El Brega, Rommel considers task impossible unless Italians provide 500 vehicles Rommel's repl…

  Held by

  The National Archives, Kew

  Date

  1942 Nov 28

  Reference

  HW 1/1171