Whakaotihia te rerenga e whai ake nei: I muri mai i te whakaekenga a Yugoslavia i te 27 o Poutu-te-rangi 1941, i whakaarohia e Hitler tenei mahi hei whakahawea whaiaro, me te karanga mo te whakangaromanga o Yugoslavia ma te Führer Directive 25. Ka tīmata i te 6 o Aperira 1941, ka whakatinanahia te Führer Directive 25 me te nui o te tauine
Ko te whakaeke i a Belgrade i puta i nga haora wawe o te whakaekenga. Ko te whakaeke pōro i ngā whāinga tūmatanui e hua ana i te matenga o ngā tāngata tūmatanui i waenganui i te 1,500 me te 17,000. Whai muri i te mutunga o te pakanga, "Generaloberst" Alexander Löhr i whakawakia mo nga hara o te pakanga tae atu ki tana mahi i te pahū o Belgrade. I whakamatea ia i te tau 1948.