"especially of Belgrade" . . . . . "first attacks on Belgrade" . "6. april 1941" . "April 1941 Nazi bombing of the city" . "bombed without the declaration of war" . "heavily bombed the city" . . . "German bombing of Belgrade on 6 April 1941" . . "bomb Belgrade" . . "April bombing of Belgrade" . "1941 German bombing of Belgrade" . . "bombing of Belgrade (1941)" . . "German bombing of Belgrade" . "invaded" . "Battle of Belgrade" . "The bombing" . "German bombs begin falling on Belgrade" . "Germany" . "German attack on Yugoslavia" . "bombing Belgrade" . "Germans bombed Belgrade" . "Axis bombing campaign in Yugoslavia" . "Belgrade" . "German bombing in April 1941" . "air attack on Belgrade" . "Operation Punishment: Bombing of Belgrade by Nazi Germany" . "Widespread destruction and civilian casualties" . "German invasion" . "Belgrade air raid" . "1941" . . "bombing" . . "bombing of Belgrade in April 1941" . "Operation \\\"Retribution\\\"" . "bombed his home" . "Operation Punishment" . "German bombing of Belgrade in 1941" . "bombed Belgrade" . . . "1941 bombing of Belgrade" . "bombing of Belgrade in 1941" . "1941-04-08" . "German bombing of Belgrade (1941)" . . . . "bombing of Belgrade" . . "Bombing of Belgrade (1941)" . . "Nazi bombing of Belgrade in April 1941" . "Aftermath" . "occupation of Belgrade in 1941" . "6 April 1941 Luftwaffe air-raids" . "Operation Retribution (1941)" . "Tens of thousands of civilians" . . "heavily bombed" . "bombed twice" . "Bombing of Belgrade" . "Axis" . "German bombing of Belgrade in World War II" . . "Belgrade was bombed" . . "6 April 1941" . "bombing of Belgrade on 6 April 1941" . "bombed in 1941" . "Operation Retribution" . "German bombing of Belgrade in April 1941" . "German Bombing of Belgrade" . "Paralysis of Yugoslav command and control" . "April 6, 1941" . "bombers attack" . . "Axis attack on Yugoslavia in 1941" . "Nazi bombing of Belgrade in 1941" . "massive German bombardment of Belgrade" . "Operation Retribution (1941)" .