Document Title Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence
Reference HW 1/3291
Conflicts Second World War
Themes Military Intelligence and Operations, Foreign Policy and International Relations
Regions Atlantic, East Asia, Europe, Mediterranean, Middle East, South Asia
Countries Brunei, Bulgaria, Great Britain, India, Italy, Norway, Russia, Singapore, Turkey
Document Type Signals Intelligence
Organisations Government Code and Cypher School, Security Service
People Edward Bridges


A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following reports on West Europe: of German Air Force (GAF) Supreme Command preparing very strong fighter forces to be used in the event of Allied large-scale attacks, on October 25; and that the GAF are to renew a bombing attack on the Antwerp sluice, on October 26; on South-east Europe: on naval matters in the Adriatic, from October 23 and 26; Naval Headlines; the Japanese ambassador in Moscow suggests caution on a renewal of the Japanese-Soviet neutrality treaty, on October 20; and from the Greek ambassador in Ankara, noting Turkish satisfaction with the outcome of the Moscow talks on the Balkans, on October 25.


German air force, military dispositions, Western Front, contingency planning, anti-aircraft defence, operations planning, aerial attacks, flooding, occupied Netherlands, effects of bombing, strafing, shipping, naval intelligence, German U-boats, convoys, Battle of the Atlantic, coastal defence, amphibious operations, shipping losses, naval operations, naval bombardment, Italian Campaign, Pacific War, Japanese navy, warships, mechanical problems, Japanese air force, mines, diplomatic intelligence, Soviet-Japanese relations, Soviet foreign policy

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