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 the Mediterranean: a German Air Force (GAF) report of unsuccessful attacks on a British naval formation on March 23-24; and on the Russian Front: a German 4 Army report for March 24; and a German 4th Army evening report for March 24.