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 Russian Front: a German IX Army Corps report for March 27; German XLVI reports and intentions for March 26-27; and on German Air Force (GAF) bombing orders for March 27; and a Naval Headlines report on German operations against Arctic convoys and Italian activity.