Operation Kosmaj

Operation Kosmaj
Part of Uprising in Serbia (1941)

Blockade of Kosmaj, 8–9 August 1941
Date7–9 August 1941 (2 days)
Location
Result German and Serbian victory
Belligerents
Germany
Serbian gendarmerie
Yugoslav Partisans
Commanders and leaders
Milan Aćimović Koča Popović
Rade Jovanović
Branko Krsmanović 
Strength
3,000 to 8,000 soldiers and officers Around 90
Casualties and losses
1 killed and 4 wounded (German claim)
10 killed and wounded including one German officer (Yugoslav partisan claim)
18 killed and 13 captured (German claim)
13 killed and one captured (Dragoslav Dimitrijević claim)
5 executed after operation

Operation Kosmaj, also known as the Blockade of Kosmaj or Operation Bader, was the first anti-guerrilla operation conducted by the Wehrmacht in occupied Serbia, aimed against the Yugoslav Partisans on Kosmaj mountain, near Belgrade.

It took place from 7 to 9 August 1941, at the very beginning of the uprising in Serbia. The total number of German and Serbian troops engaged in the operation is roughly estimated between 3,000 and 8,000 soldiers and officers, supported by tanks. In contrast, the Kosmaj Partisan Detachment at the end of July had around 94 fighters.