Throughout human history, wars have been most closely related to violence. Fatalities as the most extreme and tragic aspect of wartime developments are one of the consequences of violence. This is especially true of World War II, which we refer to as total war. In the European context, with regard to the loss of human lives during World War II and in the immediate post-war period, Slovenia with its estimated 97,000 deaths belongs among the regions severely affected by the war, while in the former Yugoslav context it is average in terms of damage.In Slovenia World War II established a practice of radical violence, whose dynamics depended on the introduction of various systems of occupation and on the combination of various violent processes, following as a result of the resistance against the occupiers, revolution, counter-revolution, collaboration, and civil war. Especially the German occupiers in the Štajerska, Koroška and Gorenjska regions immediately responded to any actions undertaken by the resistance, usually with mass executions of hostages and measures taken against families, for example, internment in the concentration camps, where many of them lost their lives. At first the Italian violence as an attempt to eliminate the partisan movement in the so-called Ljubljana Province and in the Slovenian littoral (Primorska) had not had the same dimensions as the German violence, until it escalated in 1942, especially in the Ljubljana Province (the shooting of hostages, deportations to the concentration camps, and so on).The partisan movement, besides opposing the occupation apparatus, also retaliated against the Slovenian population in case of its actual or suspected collaboration with the occupation authorities. Revolutionary background is especially noticeable in the developments in the Ljubljana Province in the spring and summer of 1942. These processes, leading to the deepening of the internal Slovenian conflict or the civil war (as the counter-revolutionary side also perpetrated various forms of violence against its Slovenian opponents, especially in the Ljubljana Province) were the reason why this area suffered the greatest losses of the population during the occupation and immediately after it. Apart from the aforementioned violence among Slovenians, which gradually but to a lesser extent also engulfed certain other areas in other regions, the occupation authorities, of course, resorted to the most violent of measures until the very end of the occupation. Especially the civilian population often suffered because of the so-called cleansing operations. Thus the occupiers are established as a factor causing the greatest number of fatalities in Slovenia with their completely un- provoked attack against Yugoslavia. This fact remains the same even if we take into account the violent epilogue of World War II with the post-war retaliation of the victorious partisan-revolutionary camp against the counter-revolution and collaboration.