Estimates of the total German war dead range from 5.5 to 6.9 million persons.[149] A study by German historian Rüdiger Overmans puts the number of German military dead and missing at 5.3 million, including 900,000 men conscripted from outside of Germany's 1937 borders.[150] Richard Overy estimated in 2014 that about 353,000 civilians were killed in Allied air raids.[151] Other civilian deaths include 300,000 Germans (including Jews) who were victims of Nazi political, racial, and religious persecution[152] and 200,000 who were murdered in the Nazi euthanasia program.[153] Political courts called Sondergerichte sentenced some 12,000 members of the German resistance to death, and civil courts sentenced an additional 40,000 Germans.[154] Mass rapes of German women also took place.[155]
The Franks realized that conditions in Germany were only going to get worse and decided to leave the country. Otto traveled to Amsterdam, the Netherlands, that summer believing that his family would be safer there than in Germany. In September he established an independent branch of Opekta Werk, which made fruit pectin for jams and jellies, and a few years later, Pectacon, which made meat spices. When Otto left for Amsterdam, Edith and the girls went to stay with Grandmother Holländer, Edith’s mother, in Aachen, Germany. In December, Edith and Margot joined Otto in Amsterdam and Anne followed in February 1934. In March 1939, Grandmother Holländer joined them also.

While the German invasion of the Soviet Union in 1941 was initially successful, the Soviet resurgence and entry of the US into the war meant the Wehrmacht (German armed forces) lost the initiative on the Eastern Front in 1943 and by late 1944 had been pushed back to the pre-1939 border. Large-scale aerial bombing of Germany escalated in 1944 and the Axis powers were driven back in Eastern and Southern Europe. After the Allied invasion of France, Germany was conquered by the Soviet Union from the east and the other Allies from the west, and capitulated in May 1945. Hitler's refusal to admit defeat led to massive destruction of German infrastructure and additional war-related deaths in the closing months of the war. The victorious Allies initiated a policy of denazification and put many of the surviving Nazi leadership on trial for war crimes at the Nuremberg trials.

In every camp, Allied soldiers encountered appalling scenes. Bergen-Belsen was liberated by British forces on 15 April 1945. It had become exceptionally overcrowded after the arrival of survivors of the death marches. Thousands of unburied bodies lay strewn around the camp, while in the barracks some 60,000 starving and mortally ill people were packed together without food or water. The mortality rate amongst those suffering from typhus was over 60 per cent.
SS formations committed many war crimes against civilians and allied servicemen.[238] From 1935 onward, the SS spearheaded the persecution of Jews, who were rounded up into ghettos and concentration camps.[239] With the outbreak of World War II, the SS Einsatzgruppen units followed the army into Poland and the Soviet Union, where from 1941 to 1945 they killed more than two million people, including 1.3 million Jews.[240] A third of the Einsatzgruppen members were recruited from Waffen-SS personnel.[241][242] The SS-Totenkopfverbände (death's head units) ran the concentration camps and extermination camps, where millions more were killed.[243][244] Up to 60,000 Waffen-SS men served in the camps.[245]
A concentration camp was not the same as an extermination camp – camps constructed with the specific purpose of mass murdering Jews and other victim groups. Despite this fact, the concentration camps claimed many thousands of victims. Imprisonment in a concentration camp meant inhuman forced labour, brutal mistreatment, hunger, disease, and random executions. It is certain that several hundred thousand died in the concentration camps. In comparison, more than three million Jews were murdered in the extermination camps.
From German Nazi, a shortening of Nationalsozialist (“National Socialist”) (attested since 1903, as a shortening of national-sozial),[1] since in German the nati- in national /ˌnatsi̯oˈnaːl/ is approximately pronounced Nazi [ˈnäːtsi]; compare Sozi (“socialist”).[1] A homonymic term Nazi was in use before the rise of the NSDAP in Bavaria as a pet name for Ignaz and (by extension from that) a derogatory word for a backwards peasant, which may have influenced[2] the use of that abbreviation by the Nazis' opponents and its avoidance by the Nazis themselves.[1][3]
This debacle did not discourage Himmler and Pohl. On the contrary, with the coming of war, in 1939, S.S. ambitions for the camps grew rapidly, along with their prisoner population. On the eve of the war, the entire K.L. system contained only about twenty-one thousand prisoners; three years later, the number had grown to a hundred and ten thousand, and by January, 1945, it was more than seven hundred thousand. New camps were built to accommodate the influx of prisoners from conquered countries and then the tens of thousands of Red Army soldiers taken prisoner in the first months after Operation Barbarossa, the German invasion of the U.S.S.R.
After September 1939, with the beginning of the Second World War, concentration camps became places where millions of ordinary people were enslaved as part of the war effort, often starved, tortured and killed.[21] During the war, new Nazi concentration camps for "undesirables" spread throughout the continent. According to statistics by the German Ministry of Justice, about 1,200 camps and subcamps were run in countries occupied by Nazi Germany,[22] while the Jewish Virtual Library estimates that the number of Nazi camps was closer to 15,000 in all of occupied Europe[23][24] and that many of these camps were run for a limited amount of time before they were closed.[23] Camps were being created near the centers of dense populations, often focusing on areas with large communities of Jews, Polish intelligentsia, Communists or Romani. Since millions of Jews lived in pre-war Poland, most camps were located in the area of the General Government in occupied Poland, for logistical reasons. The location also allowed the Nazis to quickly remove the German Jews from within Germany proper.