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 South Europe: of Army Group B's request for smoke troops for air defence, on October 22; of a German instruction for smoke acid to be delivered to north Italy, on October 23; and that the 76th Panzer Corps orders its subordinate divisions to withdraw, on October 23.