World War II: Germany begins the evacuation of 1.8 million people from East Prussia, a task which will take nearly two months.

Nazi Germany, officially the German Reich and later the Greater German Reich, was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictatorship. The Third Reich, meaning "Third Realm" or "Third Empire", referred to the Nazi claim that Nazi Germany was the successor to the earlier Holy Roman Empire (800–1806) and German Empire (1871–1918). The Third Reich, which the Nazis referred to as the Thousand-Year Reich, ended in May 1945, after 12 years, when the Allies defeated Germany and entered the capital, Berlin, ending World War II in Europe.

German civilian population and military personnel were evacuated from East Prussia between 20 January and March 1945. The evacuation was initially organized and carried out by state authorities but quickly turned into a chaotic flight from the Red Army.

East Prussia was a province of the Kingdom of Prussia from 1772 to 1829 and again from 1878 ; following World War I it formed part of the Weimar Republic's Free State of Prussia, until 1945. Its capital city was Königsberg. East Prussia was the main part of the region of Prussia along the southeastern Baltic Coast.