Document Title Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence
Reference HW 1/1715
Conflicts Second World War
Themes Military Intelligence and Operations, Foreign Policy and International Relations
Regions Africa, Atlantic, East Asia, Europe, Mediterranean, Middle East, North America
Countries Azores, Balearic Islands, Cape Verde, China, Crete, England, France, Germany, Gibraltar, Great Britain, Greece, Guinea, Holland, Italy, Japan, Majorca, Netherlands, Norway, Portugal, Russia, Sardinia, Sicily, South Africa, Soviet Union, Spain, Switzerland, Tunisia, Turkey, United States of America
Document Type Signals Intelligence
Organisations Foreign Office, Security Service, Government Code and Cypher School
People Edward Bridges, Karl Dönitz, Adolf Hitler, Benito Mussolini, Franklin Delano Roosevelt, Josef Stalin


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 the Mediterranean: the German Air Force (GAF) at Trapani report an Allied raid, on June 4; on the German Navy: a situation report for June 4; on the Southern Russian Front: the GAF claim a bombing success against Kursk, on June 2; Naval Headlines, covering U-boat operations in the Atlantic; from the Brazilian minister in Ankara, forwarding Turkish information of German threats to Italy, on June 2; from the Portuguese ambassador in London, that Eden is very unhappy at the Portuguese agreement to supply Germany, on May 13; from the Turkish ambassador in Vichy, communicating French information that the Germans will not mount an offensive against the Soviets, but will concentrate on the West, on May 25; from the Japanese minister in Lisbon, on Churchill's speech and Anglo-U.S. strategy, on May 20; from the Japanese ambassador in Berlin, detailing a British raid on German dams, on May 20; from the Greek ambassador in Kuibyshev, that the Soviets expect a German attack, as of May 12; from the German ambassador in Madrid, describing the Italian ambassador's interview with Franco, on May 17; from the Greek ambassador in Ankara, on Turkish fears following the Allied victory in Tunisia, on May 14; from the Japanese Foreign Minister to the ambassador in Berlin, on an interest in German anti-U.S. propaganda, on May 24; from the Japanese minister in Lisbon, on Allied use of Portuguese islands in the Atlantic, on May 24; from the Japanese minister in Berne, describing Swiss fears of an invasion and German strategy in Italy, on May 26; from the Japanese ambassador in Berlin, noting the effect of Allied air raids on Germany, and German-Italian friction, on May 26; and from Roumania: on a prohibited coastal zone, from June 3.


effects of bombing, air raids, airfields, military situation reports, naval warfare, shipping losses, warships, torpedo boats, aerial attacks, German air force, Eastern Front, naval intelligence, Battle of the Atlantic, German U-boats, fuel, amphibious operations, tactics, diplomatic intelligence, German-Italian relations, Portuguese neutrality, trade, war materials, German strategy, Allied strategy, anti-aircraft defence, predicting enemy intentions, Spanish neutrality, Turkish foreign policy, rumours, Swiss neutrality

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