territory. These troops were used against the resistance in the north-west of the territory, which they pacified by the end of October. Due to stronger resistance in the south-west, the 113th Infantry Division arrived from the Eastern Front in November and this part of the territory was also pacified by early December 1941. Following the suppression of the uprising, the Germans again withdrew the combat formations from the territory, leaving behind only the weaker garrison divisions. In January 1942, the 113th Infantry Division returned to the Eastern Front, and the 342nd Infantry Division deployed to the NDH to fight the Partisans. To secure the railroads, highways and other infrastructure, the Germans began to make use of Bulgarian occupation troops in large areas of the occupied territory, although these troops were under German command and control. This occurred in three phases, with the Bulgarian 1st Occupation Corps consisting of three divisions moving into the occupied territory on 31 December 1941. This corps was initially responsible for about 40% of the territory (excluding the Banat), bounded by the Ibar river in the west between Kosovska Mitrovica and Kraljevo, the West Morava river between Kraljevo and Čačak, and then a line running roughly east from Čačak through Kragujevac to the border with Bulgaria. They were therefore responsible for large sections of the Belgrade–Niš–Sofia and Niš–Skopje railway lines, as well as the main Belgrade–Niš–Skopje highway. In January 1943, the Bulgarian area was expanded westwards to include all areas west of the Ibar river and south of a line running roughly west from Čačak to the border with occupied Montenegro and the NDH. This released the 7th SS Volunteer Mountain Division Prinz Eugen, which had been garrisoning this area over the winter, to deploy into the NDH and take part in Case White against the Partisans. Many members of the Volksdeutsche from Serbia and the Banat were serving in the 7th SS Volunteer Mountain Division Prinz Eugen. This division was responsible for war crimes committed against the peoples of Bosnia and Herzegovina. In July 1943, the Bulgarian occupation zone expanded northwards, with a fourth division, the 25th Division taking over from the 297th Infantry Division in the rest of the territory (excluding the Banat) that did not share a border with the NDH. From this point, German forces only directly occupied the immediate area of Belgrade, the northwest region of the territory that shared a