 Complete the following phrase:  The Germans themselves made heavy use of atrocity propaganda, both before the war and during it. Violence between ethnic Germans and the Poles, such as the 1939 Bloody Sunday massacre, was characterised as barbaric slaughter of the German population by the subhuman Poles, and used to justify the genocide of the Polish population according to the Nazi Generalplan Ost plan. Late in the war, Nazi propaganda used exaggerated depictions of real or planned Allied crimes against Germany, such as the 