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: of German losses, on March 28; the German Air Force (GAF) at Tunis' 1st evening report, for March 30; on the necessity of supplying the Italian 1st Army partly by sea, on March 30; and on the GAF's intentions for March 31.