Serbian Civil War
The Serbian Civil War is a conflict in Serbia between remnants of wartime partisan organizations and the Government of National Salvation that emerges as a result of the death of Adolf Hitler and the complications it has on the Reich's ability to administer its various European holdings.
Origins
After the surrender of Yugoslavia on April 17th, 1941 following an extremely quick campaign, the former state was partitioned mainly into the Independent State of Serbia and the Independent State of Croatia. Despite a prolonged guerilla campaign waged by the Ravna Gora movement (or 'Chetniks') and the Yugoslav Partisans, the Reich was eventually able to mostly pacify the region, enough so for activity by these groups to mostly have ceased.
While Croatia fell into the Italian sphere of influence, Serbia remained in the Reich's grasp. Heavily dependent on the Reich both economically and militarily to avoid the resurgence of the Partisans, the Independent State of Serbia, in practice, operated almost as dependently as a Reichskommissariat; however, due to its position on the border with the Italian sphere, the tactical advantage offered for operations into Italy in the event of a conflict - a conflict deemed inevitable by the aging Hitler - the Reich was saddled with covering the expenses, which only worsened the ailing economic state of Germany after the war.
Outbreak
Following the death of Adolf Hitler, the Reich's ability to administer territories beyond - and increasingly, within - itself rapidly disintegrated. With it came the resurgence of many partisan and rebel movements-- and none so as pronounced as in Serbia. Despite years of repression, upon the assassination of Dimitrije Ljotić, the Serbian National Liberation Front rises up against the Independent State government.
In Game
The Serbian Civil War occurs consistently in October, almost immediately after the death of Adolf Hitler. It has very little bearing on the outcome of the game and presently, no country can interfere with it.