The evacuation, which had been delayed for months, was initiated due to fear of the Red Army advances during the East Prussian Offensive. Some parts of the evacuation were planned as a military necessity, Operation Hannibal being the most important military operation involved in the evacuation. However, many refugees took to the roads on their own initiative because of reported Soviet atrocities against Germans in the areas under Soviet control. Both spurious and factual accounts of Soviet atrocities were disseminated through the official news and propaganda outlets of Nazi Germany and by rumors that swept through the military and civilian populations.