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: German Africa tank returns for March 22; that more elements of the 10th Panzer Division arrive in the front area; that the 1st Army is to continue a counter-attack beyond the old defence line, on March 22; several tactical reports giving details of combat operations on March 21; and German Air Force (GAF) air reconnaissance reports of Allied tanks and vehicles, on March 22.