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) in Tunis' evening report for March 29, detailing Allied air attacks; and a GAF report on large concentrations of enemy vehicles, on March 30; on the Southern Russian Front: of the redeployment of GAF units, mainly to Crimea, on March 29; and a GAF evening report, for March 29.