Government Code and Cypher School: Signals Intelligence Passed to the Prime Minister, Messages and Correspondence

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 Western Europe: of German Air Force (GAF) operations orders for the night of March 26; and that orders by Kesselring include the resubordination of specified units, and a counter-attack on the Allies who have crossed the Rhine, on March 25; and on South-east Europe: that Oberkommando der Wehrmacht (OKW) orders Army Group F, which has hitherto been controlling Balkan operations, to be sent to Berlin for employment with Army Group Vistula, on March 23.