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 Tunis Air Corps' report for March 16 and their combat plans for the 17th; of the 5th Panzer Army's and Tunis Air Corps' combat plans for March 17, with one Panzer division to stage an attack on the northern Tunisian sector; and on the Russian Front: a situation report for March 16.