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: the German Air Force (GAF) at Tunis' 1st evening report for April 16; of fighting in the Medjez area, on April 14-15; a GAF general report on the ground situation, on April 16; on the Mediterranean: of Axis shipping movements for the night of April 16-17; and of GAF fighter protection for ships and aircraft travelling to Tunisia on April 17.