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 North Africa: a German 15th Division report of RAF raids; on the German front line; that Stuka dive bombers are to operate in front of the Africa Corps; that the 15th Panzer Division is attacking to the east near El Ruweihsat; and that Tobruk is inadequately protected against torpedo-bomber attack; and on the Southern Russian Front: that the 4th Air Fleet is supporting a Panzer thrust to the Don, with attacks against railways and bridges at Rostov and against Soviet forces retreating over the Don planned.