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: of a move of the 21st Panzer Division and air defence units, on April 1; the German Air Force (GAF) at Tunis' 3rd evening report, for April 2; that battle experience in Africa has shown German armour-piercing weapons to be inadequate, on April 2; of intended reinforcements for Army Group Africa, on March 30; that units of the Hermann Goering Division are to be flown to Africa on April 3; and on Army Group Africa being notified of the cargoes of supply ships, on March 30, with five being subsequently sunk; and on the Southern Russian Front: the German Navy give details of the traffic passing across the Kerch Straits, on March 31.