The evacuation of East Prussia was the movement of German civilian population and military personnel from East Prussia between 20 January and March 1945, that was initially organized and carried out by state authorities but quickly turned into a chaotic flight from the Red Army.
A part of the evacuation of German civilians towards the end of World War II, these events are not to be confused with the expulsion from East Prussia that followed after the war had ended. The area that was evacuated was not the Gau East Prussia, but the inter-war East Prussia where most people already held German citizenship. German citizens in Memel and other regions with proximity to East Prussia also took part in the evacuation, wishing to escape by sea, even though in their regions there was no official evacuation announced.
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.
Despite having detailed evacuation plans for some areas, the German authorities, including the Gauleiter of East Prussia, Erich Koch, delayed action until 20 January, when it was too late for an orderly evacuation, and the civil services and Nazi Party were eventually overwhelmed by the numbers of those wishing to evacuate. Coupled with the panic caused by the speed of the Soviet advance, civilians caught in the middle of combat, and the bitter winter weather, many thousands of refugees died during the evacuation period. The Soviet forces took control of East Prussia only in May 1945.