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Belgrade offensive

1944 Second World War battle

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Through Joseph Stalin, Balkans and Blockade

The primary objectives of the Belgrade offensive centered on lifting the German occupation of Serbia, seizing Belgrade as a strategic holdout in the Balkans, and severing German communication lines between Greece and Hungary. The spearhead of the offensive was executed by the Soviet 3rd Ukrainian Front in coordination with the Yugoslav 1st Army Corps. Simultaneous operations in the south involved the Bulgarian 2nd Army and Yugoslav XIII Army Corps, and the incursion of the 2nd Ukrainian Front northwards from the Yugoslav-Bulgarian border placed additional pressure on German command. There were additional skirmishes between Bulgarian forces and German anti-partisan regiments in Macedonia that represented the campaign's southernmost combat operations.

Background

Developments in Yugoslavia

By the summer of 1944, the Germans had not only lost control of practically all the mountainous area of Yugoslavia but were no longer able to protect their own essential lines of communication. Another general offensive on their front was unthinkable, and by September it was clear that Belgrade and the whole of Serbia must shortly be free of them. These summer months were the best the movement had ever seen; there were more recruits than could be armed or trained, desertions from the enemy reached high numbers; one by one the objectives of resistance were reached and taken.

— Basil Davidson

In August 1943, the German Wehrmacht had two army formations deployed in the Balkans: Army Group E in Greece and the 2nd Panzer Army in Yugoslavia and Albania. Army Group F headquarters (Generalfeldmarschall Maximilian von Weichs) in Belgrade acted as a joint high command for these formations, as well as for Bulgarian and Quisling formations.

After the collapse of the uprising in December 1941, anti-Axis activity in Serbia decreased significantly, and the focus of resistance moved to other, less populated areas. Consequently, although Serbia had great significance to the Germans, very few troops actually remained there; according to Schmider only about 10,000 in June 1944. In the following years, Tito repeatedly tried to reinforce the partisan forces in Serbia with experienced units from Bosnia and Montenegro. From the spring of 1944, the Allied command had assisted in these efforts. The Germans actively opposed these efforts by concentrating forces in the border regions of Bosnia and Montenegro, in order to disturb Partisan concentrations, to inflict casualties on Partisan units, and to push them back with a series of large-scale assaults.

In July 1944, German defenses began to fail. After the failure of Operation Draufgänger (Daredevil) – a 1944 anti-partisan operation in Montenegro, Yugoslavia, and Northern Albania – three divisions of the Narodnooslobodilačka vojska Jugoslavije (the People's Liberation Army of Yugoslavia) (NOVJ) – managed to cross the Ibar River to the east and threaten the main railroad lines. After the failure of Operation Rübezahl in Montenegro in August 1944, two additional NOVJ divisions broke through the German blockade, successfully entrenching themselves in western Serbia. Army Group F command responded by deploying additional forces: the 1st Mountain Division arrived in Serbia in early August, followed by the 4th SS Panzergrenadier Division from the Thessaloniki area.

Developments in Romania in late August 1944 confronted Army Group F command with the necessity of an immediate large-scale concentration of troops and weapons in Serbia in order to cope with a threat from the east. The Allied command, and the NOVJ supreme command, predicted this scenario and developed a plan for the occasion. On 1 September 1944, a general attack from the ground and from the air on the German transport lines and installations (Operation Ratweek) began. These attacks largely hindered German troop movements, with units disassembled and tied to the ground.

In the meantime, the 1st Proletarian Corps, the main partisan formation in Serbia, continued with reinforcing and developing its forces and with seizing positions for the assault on Belgrade. On 18 September Valjevo was taken, and on 20 September Aranđelovac. Partisans achieved control of a large area south and southwest of Belgrade, thus forming the basis for the future advance towards Belgrade.

In response to the defeat of German forces in the Second Jassy–Kishinev offensive in late August 1944, which forced Bulgaria and Romania to switch sides, and to the advance of Red Army troops into the Balkans, Berlin ordered Army Group E to withdraw into Hungary. But the combined actions of Yugoslav partisans and Allied air forces impeded German movements with Ratweek. With the Red Army on Serbia's borders, the Wehrmacht put together another provisional army formation from available elements of Army Group E and the 2nd Panzer Army for the defense of Serbia, called "Army Group Serbia" (German: Armeeabteilung Serbien).

Regional developments

As a result of the Bulgarian coup d'état of 1944, the pro-Axis regime in Bulgaria was overthrown and replaced with a government of the Fatherland Front led by Kimon Georgiev. Once the new government came to power, Bulgaria declared war on Germany. Under the new pro-Soviet government, four Bulgarian armies, 455,000 strong were mobilized and reorganized. In early October 1944, three Bulgarian armies, consisting of around 340,000 men, were located on the Yugoslav – Bulgarian border.

By the end of September, the Red Army 3rd Ukrainian Front troops under the command of Marshal Fyodor Tolbukhin were concentrated at the Bulgarian-Yugoslav border. The Soviet 57th Army was stationed in the Vidin area, while the Bulgarian 2nd Army (General Kiril Stanchev commanding under the operational command of the 3rd Ukrainian Front) was stationed to the south on the Niš rail line at the junction of the Bulgarian, Yugoslav, and Greek borders. This allowed the arrival of the Partisans 1st Army from Yugoslav territory, in order to provide support to their 13th and 14th Corps collaborating in the liberation of Niš and supporting the 57th Army's advance to Belgrade, respectively. The Red Army 2nd Ukrainian Front's 46th Army was deployed in the area of the Teregova river (Romania), poised to cut the rail link between Belgrade and Hungary to the north of Vršac.

Pre-operations were coordinated between the Soviets and the commander-in-chief of the Yugoslav Partisans, Marshal Josip Broz Tito. Tito arrived in Soviet-controlled Romania on 21 September, and from there flew to Moscow where he met with Soviet premier Joseph Stalin. The meeting was a success, in particular because the two allies reached an agreement concerning the participation of Bulgarian troops in the operation that would be conducted on Yugoslav territory.

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