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 West Europe: of a 90th Army Corps attack being prevented by Allied air attacks, on December 18; battle reports of December 18 from the area of the German offensive; and of the 90th Corps being transferred from Army Group G and subordinated to the Commander in Chief (C-in-C) West, on December 19.