Document Title Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence
Reference HW 1/2937
Conflicts Second World War
Themes Military Intelligence and Operations
Regions Africa, Atlantic, East Asia, Europe, Mediterranean, Middle East
Countries Austria, Cyprus, England, France, Great Britain, Greece, Italy, Japan, Romania, Syria
Document Type Signals Intelligence
Organisations Government Code and Cypher School
People Karl Dönitz, Hermann Göring


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 contains a message from C to the Prime Minister (PM); and the following reports: Naval Headlines, covering operations of the S-boat 5th and 9th Flotillas in the Channel; that two-thirds of the French workmen at the Lorient dockyard have defected; that a Japanese submarine is expected in a Biscay port; that the evacuation of Elba is estimated to require two nights but four weeks are needed to remove all the moveable material; that supplies to Benedetto have been suspended, and gun batteries are to be dismantled; that Japanese battleships and cruisers were sighted moving south from the Sibutu Passage; and details of future convoy operations between Japan and Saipan, Palau and Truk issued by the HQ of the Grand Surface Escort Force; from the Japanese consul-general in Vienna, describing the effects of Allied air raids on Austrian targets, on May 30; on France: of orders for the examination of harbours in the South of France for their destruction, on June 6, 7 and 8; of Army A Group's intention to bring up rear elements of the 2nd SS Panzer Division when transport arrives, but in the meantime short-term operations against guerilla unrest cannot be avoided, on June 11; that the 17th SS Panzer Grenadier Division intends to launch a counter-attack to retake the position north of Carentan, on June 12; that the 3rd Air Fleet orders all aircraft to be fitted with bomb-release gear, with their primary task to be bombing, on June 11; an appreciation from Berlin that the danger period for an Allied invasion is from June 12 onwards, probably to take place in southern France, based on the concentrations of troops and exercises in southern England and an assessment of the tasks of the French Resistance organisation, on June 1, with an operation against the Balkans also anticipated; on Italy: a situation report from the 2nd Air Fleet for June 11, detailing Allied spearheads east of Lake Bolsena, and that Piansano has been occupied; and on a line of blocking positions being set up by Army Abteilung von Zangen, on June 8.


naval intelligence, demolitions, ports, naval warfare, shipping losses, German navy, military shortages, deserters, forced labour, anti-Nazi resistance, Pacific War, aerial reconnaissance, naval operations, Japanese navy, United States Navy, convoys, diplomatic intelligence, air raids, effects of bombing, intelligence requirements, troop movements, German army, security, guerrilla warfare, operations planning, counter-attacks, Battle of Normandy, Operation Overlord, German strategy, aerial attacks, bombing, invasion threat, Allied strategy, Italian Campaign, military dispositions, defence

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