The ‘Journal of Intelligence History’ article ‘The German ‘ultra’: signals intelligence in Yugoslavia 1943–1944’ by Gaj Trifković has interesting information on the dissemination and use of signals intelligence by the Germans in their war against the Chetnik and Partisan resistance movements in WWII.
This article deals with the extensive signals surveillance program operated by the Wehrmacht and directed at their most dangerous enemy in the Balkans, the Yugoslav Partisans. This subject has so far received surprisingly little attention in academic circles despite the fact that it was one of the crucial pillars of the entire Axis counter-insurgency effort in Yugoslavia and that it was one of the most successful actions of its kind conducted by the German intelligence. Based largely on previously unpublished primary sources, as well as post-war literature, this article will outline the workings of the program during its heyday in the years 1943–1944 and seek to establish its impact on the battlefield. As such, it will hopefully prove to be useful to both students of wartime events in the Western Balkans and to researchers of intelligence services during the Second World War in general.