Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence

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 South-east Europe: that the German Admiralty considers that operation WIGAN against Vis can only be carried out if Allied air superiority is broken, on April 6; the German Air Force (GAF) report heavy damage caused in a raid on Semlin airfield, on April 17; a GAF evening raids report, for April 16; the GAF in Bulgaria report a raid on Sofia, on April 17; and that a German naval officer is to coordinate minesweeping on the Danube in view of an extremely menacing enemy parachute mine offensive, on April 16; on South Europe: that the 715th Division suspects the enemy is preparing for an attack against the Cisterna area, on April 17; and that the 2nd Air Fleet was unable to carry out an anti-submarine patrol because of a lack of forces, on April 17; on Germany: the GAF report an Allied raid on Rostock, on April 11; and of GAF priorities for the salvage of air defence aircraft, on April 11; on the Southern Russian Front: an evening situation report from the sea defence commandant in Crimea, on April 16, describing preparations for a stand at Sevastopol; that a German general is to ensure that troops arriving from Crimea to Bulgaria appear before Bulgarian troops as faultlessly disciplined and organised; Sevastopol reports that 21,704 were evacuated between April 1 and 15; that the German 17th Army reaches Sevastopol and is ready to defend it, on April 16; and a German secret service report on Roumania, for April 9, detailing changes in command, army divisions going over to the Soviets, and 15,000 dead in a Bucharest air raid; Naval Headlines; and from the French chargé in Bucharest to Laval in Vichy, outlining the grave situation of German-Roumanian troops in Roumania, and a devastating Soviet air raid on Constanza, on April 13.