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 Southern Europe: five bridgehead battle reports for March 3; and on the Allied bombing of Rome, on March 3; a naval situation report in all theatres for March 3; and an appreciation of the Atlantic situation from a U-boat point of view, on March 2; and from the Japanese military attaché in Sofia, on the bombing of Sofia, from January 25.