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 North Africa: an Army Group Africa report for March 18, stating that the Allies are pushing the local population across the German front line in northern Tunisia, and that in the Mareth area Allied forces are building up reinforcements; an Army Group Africa report for March 17, stating that Gafsa has been abandoned, that the 1st Italian Army is in defensive positions for an expected large-scale Allied attack in the Mareth area, and noting a slight improvement in the fuel situation but with ammunition supplies running low; the Tunis Air Corps' report for March 19, noting little air activity because of very poor weather conditions; German sigint confirms the effects of the weather on Allied operations; German tank returns for March 17; a congratulatory message from the Ground Officer Commanding in Chief (GOC-in-C) of Army Group Von Armin to the Officer Commanding (OC) the 90th Light Division on the unit's successful counter-attack at a decisive point of the defensive battle, on March 19; a German Air Force (GAF) in Berlin circular of March 19, giving an example of a GAF aircraft successfully bombing enemy torpedoes, suggesting that bomber crews should in future employ this effective technique; and regarding the GAF Berlin circular of March 19, a minute dated March 28 from probably the First Sea Lord (ISL) to the Prime Minister (PM) following a query by the PM, to the effect that the Allies were carrying out trials of this technique but these were unlikely to result in operational use by the Allies.