Evacuation of East Prussia The evacuation of East Prussia refers to the evacuation of the German civilian population and military personnel in East Prussia and the Klaipėda region between 20 January , and March 1945 , as part of the evacuation of German civilians towards the end of World War II . It is not to be confused with the expulsion after the war had ended , under Soviet occupation . 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 because of reported Soviet atrocities against Germans in the areas under Soviet control . Both alleged and factual accounts of Soviet atrocities were disseminated not only through the official news and propaganda outlets of the Third Reich , but also by rumors that swept through the military and civilian population . Despite having detailed evacuation plans for some areas , authorities of the Third Reich , including the Gauleiter of East Prussia , Erich Koch , delayed action until January 20 , when it was too late for an orderly evacuation , and the civil services were eventually overwhelmed by the huge number 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 Soviets took complete control of East Prussia in May 1945 . A large part of the German civil population of about 2 . 5 million managed to evacuate , though about 25 , 000 – 30 , 000 were killed during the Soviet offensive . In May 1945 Soviet authorities registered 193 , 000 Germans in East Prussia but an estimated number of 800 , 000 managed to return after the end of military actions , most of whom were later forcibly expelled by the Soviet and Polish authorities . The Polish census of 1950 indicated that 164 , 000 of the former German population remained in East Prussia . Most later emigrated to Germany . Propaganda . German . The Soviet army initiated an offensive into East Prussia in October 1944 , but it was temporarily driven back two weeks later . After that , the German Ministry of Propaganda reported that war crime s had taken place in East Prussian villages , in particular in Nemmersdorf , where ( according to the Ministry ) inhabitants had been raped and killed by the advancing Soviets . Since the Nazi war effort had largely stripped the civil population of able - bodied men for service in the military , the victims of the atrocity were primarily old men , women , and children . Upon the Soviet withdrawal from the area , German authorities sent in film crews to document what had happened , and invited observers as further witnesses . A documentary film from the footage obtained during this effort was put together and shown in cinemas in East Prussia , with the intention of hardening civilian and military resolve in resisting the Soviets . Nazi propaganda about the atrocities at Nemmersdorf , as well as on other crimes committed in East Prussia , convinced the remaining civilians that they should not get caught by the advancing enemy . Soviet . Since many Soviet soldiers had lost family and friends during the German invasion and partial occupation of the USSR ( about 17 million Soviet civilians plus 10 million Soviet soldiers died in World War II , more , in absolute terms , than in any other country ) , many felt a desire for vengeance . Murders of Axis prisoners of war and German civilians are known from cases at Soviet military tribunals . Also , when Soviet troops moved into East Prussia , large numbers of enslaved " Ostarbeiter " ( " Eastern workers " ) were freed , and knowledge of the suffering and deaths of many of these workers hardened the attitude of many Soviet soldiers towards East Prussians . Lev Kopelev , who took part in the invasion of East Prussia , sharply criticized atrocities against the German civilian population . For this he was arrested in 1945 and sentenced to a ten - year term in the Gulag for " bourgeois humanism " and for " pity for the enemy " . Aleksandr Solzhenitsyn also served in East Prussia in 1945 and was arrested for criticizing Joseph Stalin and Soviet crimes in private correspondence with a friend . Solzhenitsyn was sentenced to an eight - year term in a labor camp . Evacuation . The evacuation plans for parts of East Prussia were ready in the second half of 1944 . They consisted of both general plans and specific instructions for many towns . The plans encompassed not only civilians , but also industry and livestock . Initially , Erich Koch , the Gauleiter of East Prussia , forbade evacuation of civilians ( until 20 January 1945 ) , and ordered that civilians trying to flee the region without permission should be instantly shot . Any kind of preparations made by civilians were treated as defeatism and " Wehrkraftzersetzung " ( undermining of military morale ) . Koch and many other Nazi functionaries were among the first to flee during the Soviet advance . Between 12 January and mid - February 1945 , almost 8 . 5 million Germans fled the Eastern provinces of the Reich . Most of the refugees were women and children heading to western parts of Germany , carrying goods on improvised means of transport , such as wooden wagons and carts , as all the motorized vehicles and fuel had been confiscated by the Wehrmacht at the beginning of the war . After the Red Army reached the coast of the Vistula Lagoon near Elbing on January 23 , 1945 , cutting off the overland route between East Prussia and the western territories , the only way to leave was to cross the frozen Vistula Lagoon to reach the harbours of Danzig / Gdańsk or Gdingen / Gdynia to be evacuated by ships taking part in Operation Hannibal . Mingled with retreating Wehrmacht units , and without any camouflage or shelter , the refugees were attacked by Soviet bomber s and fighter aircraft . Many wagons broke through the bomb - riddled ice covering the brackish water . Also horses and caretakers from the Trakehner stud farms were evacuated with the wagon trains . The evacuation was severely hampered by Wehrmacht units , which clogged roads and bridges . The remaining men aged 16 – 60 were immediately incorporated into the Volkssturm . However , some Volkssturm members , without basic military knowledge and training , escaped into the woods , hoping to simply survive . Refugee trains leaving East Prussia were also extremely crowded , and due to the very low temperatures , children often froze to death during the journey . The last refugee train left Königsberg on January 22 , 1945 . Military writer Antony Beevor wrote , in " Berlin : The Downfall " , that : Martin Bormann , the Reichsleiter of the National Socialist Party , whose Gauleiter s had in most cases stopped the evacuation of women and children until it was too late , never mentions in his diary those fleeing in panic from the eastern regions . The incompetence with which they handled the refugee crisis is chilling , yet in the case of the Nazi hierarchy it is often hard to tell where irresponsibility ended and inhumanity began . " Operation Hannibal . Operation Hannibal was a military operation that started on January 21 , 1945 , on the orders of Admiral Karl Dönitz , withdrawing German troops and civilians from East Prussia . The flood of refugees turned the operation into one of the largest emergency evacuation s by sea in history — over a period of 15 weeks , somewhere between 494 and 1 , 080 merchant vessels of all types and numerous naval craft , including Germany ' s largest remaining naval units , would transport about 800 , 000 - 900 , 000 refugees and 350 , 000 soldiers across the Baltic Sea to Germany and occupied Denmark . This evacuation was one of the German Navy ' s most significant achievements during the war . The greatest recorded maritime disaster in history occurred during this operation , when the passenger ship " Wilhelm Gustloff " was hit by three torpedoes from the Soviet submarine S - 13 in the Baltic Sea on the night of 30 January 1945 . She sank in under 45 minutes ; figures for the number of deaths vary , from possibly more than 5 , 300 , to 7 , 000 or 7 , 400 . The 949 survivors were rescued by Kriegsmarine vessels led by cruiser " Admiral Hipper " , although it is claimed that " the big warship could not risk heaving to , with a submarine close by . " Also , on 10 February , the SS " General von Steuben " left Pillau with 2 , 680 refugees onboard ; it was hit by torpedoes just after departure , killing almost all aboard . Königsberg . On January 24 , 1945 , the 3rd Belorussian Front led by General Chernyakhovsky , surrounded the capital city of East Prussia , Königsberg . The 3rd Panzer Army and around 200 , 000 civilians were trapped inside the city . In response to this , General Georg - Hans Reinhardt , commander of the Army Group Center , warned Hitler of the imminent Soviet threat , but the Führer refused to act . Due to the rapid approach of the 2nd Belorussian Front led by General Rokossovsky , Nazi authorities in Königsberg decided to send trains full of refugees to Allenstein , without knowing that the town had already been captured by the Soviet 3rd Guards Cavalry Corps . During the Soviet assault , the Frische Nehrung spit became the last means of escape to the west . However , civilians who tried to escape along the spit were often intercepted and killed by Soviet tanks and patrols . Two thousand civilians left Königsberg every day and tried to reach the already crowded town of Pillau . The final Soviet assault on Königsberg started on 2 April with a heavy bombardment of the city . The land route to Pillau was once again severed and those civilians who were still in the city died in their thousands . Eventually , the Nazi garrison surrendered on April 9 , and as Beevor wrote , " the rape of women and girls went unchecked in the ruined city " Crimes . The widely publicized killings and rapes in places like Nemmersdorf by the Soviets led to a severe degree of fear in the entire German population of East Prussia . Even enslaved Soviet women liberated by Soviet troops were often raped by Soviet soldiers . Beevor argues that these acts of violence were motivated by a desire for revenge and retribution for crimes committed by the Nazis during their invasion of Soviet Union . War reporter Vasily Grossman said that the rear - guard units of the advancing Soviet armies were usually responsible for a large number of the crimes committed by Red Army personnel . Wealthy civilians of East Prussia were often shot by Soviet soldiers , their goods stolen , and their houses set on fire , as a result of Soviet propaganda advocating the eradication of the aristocracy . Soviet Officers like Lev Kopelev , who tried to prevent crimes , were accused of pity for the enemy and became Gulag prisoners . Aftermath . The Red Army eliminated all pockets of resistance and took control of East Prussia in May 1945 . The exact number of civilian dead has never been determined , but is estimated to be at least 300 , 000 , with most of them dying under miserable conditions . However , most of the German inhabitants , which at that point consisted mainly of children , women , and old men , did escape the Red Army as part of the largest exodus of people in human history . As Antony Beevor also said : Based on West German Statistisches Bundesamt figures from 1958 , in total , out of a pre - war population of 2 , 490 , 000 about 500 , 000 died during the war , including military dead and civilians , 311 , 000 civilians dying during the wartime flight and postwar expulsion of Germans ; 1 , 200 , 000 managed to escape to the western parts of Germany , while about 800 , 000 pre - war inhabitants remained in East Prussia in summer 1945 . The figure of 311 , 000 civilian deaths is included in the overall estimate of 2 . 2 million expulsion deaths that is often cited in historical literature . According to other sources in summer 1945 about 800 , 000 Germans were still living in East Prussia . The Red Army ' s brutality towards civilians during the East Prussian campaign , coupled with years of Nazi propaganda regarding the Soviet Union , led many German soldiers on the Eastern Front to believe that " there could be no purpose in surviving Soviet victory " . This belief motivated many German soldiers to continue fighting even though they believed that the war was lost , and this contributed to higher Soviet casualties . Most Germans who were not evacuated during the war were expelled from East Prussia and the other former German territories east of the Oder - Neisse line in the years immediately after the end of World War II , as agreed to by the Allies at the Potsdam conference , because in the words of Winston Churchill : After World War II , as also agreed at the Potsdam Conference ( which met from 17 July until 2 August 1945 ) , all of the area east of the Oder - Neisse line , whether recognized by the international community as part of Germany before 1933 or occupied by Germany during World War II , was placed under the jurisdiction of other countries . The relevant paragraph regarding East Prussia in the Potsdam Agreement is :