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 North Africa: that the Germans fear a naval bombardment of Derna and Benghazi, on March 10; on the Mediterranean: the German Air Force (GAF) are to attack British naval forces, on March 11; and on the Russian Front: a GAF report of Soviet paratroop operations, for March 10; a report on German leave arrangements for March 23-May 3; and a German report on Soviet attacks in the Taganrog area on March 10.