Operation Retribution or Operation Punishment was the April 1941 German bombing of Belgrade, the capital of Yugoslavia, in retaliation for the coup d'état that overthrew the government that had signed
Bomb-damaged buildings in Belgrade in April 1941
The bomb-damaged Old Palace in central Belgrade, struck during the first wave of bombing on 6 April 1941
A 2008 photograph of the ruins of the old National Library of Serbia, bombed on 6 April 1941
Monument to the Yugoslav pilots killed during Operation Retribution, located in Zemun
Führer Directive No. 25 was a March 1941 directive issued by German dictator Adolf Hitler during World War II. It ordered German intervention against Yugoslavia and Greece in the Balkans campaign, in
First page of Führer Directive No. 25
The movements of the Axis forces in Yugoslavia and Greece.
The Axis invasion of Yugoslavia.
The Luftwaffe propaganda airimage of Belgrade burning, as appeared in the Nazi propaganda magazine Der Adler, No. 9, 29 April 1941.