‘”On the morning of Palm Sunday, while children slept their innocent sleep and the church bells were ringing for prayer to God, the German aeroplanes without warning let fall a rain of bombs on this historic town”’. So wrote King Peter of Yugoslavia after the bombing of Belgrade 6th April 1941. ‘The King went on to describe the terror of the women and children who were machine-gunned as they fled from their homes by low-flying planes.’ (1) Hitler termed this invasion Operatio