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 the Mediterranean: a further report on the Allied air attack against Olbia on June 18; a summary for June 16, noting that 2 large Allied convoys entered the Mediterranean via Gibraltar; and detailing Axis air reconnaissance of Bizerta, Bone and Oran; on the Russian Front: of Axis air strikes against Russian positions in the North Caucasus, on June 17; and Naval Headlines.