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 the German Air Force's (GAF's) reconnaissance results for March 21 on the southern Tunisian Front; on combat plans for March 22; that the front line in northern Tunisia is unchanged, as of March 21; and the Tunis Air Corps' report for March 21, noting the Axis front line to be in the El Guettar area.