While civilian efforts had an impact on public opinion, the army was the only organisation with the capacity to overthrow the government.[443][444] A major plot by men in the upper echelons of the military originated in 1938. They believed Britain would go to war over Hitler's planned invasion of Czechoslovakia, and Germany would lose. The plan was to overthrow Hitler or possibly assassinate him. Participants included Generaloberst Ludwig Beck, Generaloberst Walther von Brauchitsch, Generaloberst Franz Halder, Admiral Wilhelm Canaris, and Generalleutnant Erwin von Witzleben, who joined a conspiracy headed by Oberstleutnant Hans Oster and Major Helmuth Groscurth of the Abwehr. The planned coup was cancelled after the signing of the Munich Agreement in September 1938.[445] Many of the same people were involved in a coup planned for 1940, but again the participants changed their minds and backed down, partly because of the popularity of the regime after the early victories in the war.[446][447] Attempts to assassinate Hitler resumed in earnest in 1943, with Henning von Tresckow joining Oster's group and attempting to blow up Hitler's plane in 1943. Several more attempts followed before the failed 20 July 1944 plot, which was at least partly motivated by the increasing prospect of a German defeat in the war.[448][449] The plot, part of Operation Valkyrie, involved Claus von Stauffenberg planting a bomb in the conference room at Wolf's Lair at Rastenburg. Hitler, who narrowly survived, later ordered savage reprisals resulting in the execution of more than 4,900 people.[450]
Auschwitz was probably chosen to play a central role in the “final solution” because it was located at a railway junction with 44 parallel tracks—rail lines that were used to transport Jews from throughout Europe to their death. Heinrich Himmler, chief of the SS, the Nazi paramilitary corps, ordered the establishment of the first camp, the prison camp, on April 27, 1940, and the first transport of Polish political prisoners arrived on June 14. This small camp, Auschwitz I, was reserved throughout its history for political prisoners, mainly Poles and Germans.

In her writing, Frank examined her relationships with the members of her family, and the strong differences in each of their personalities. She considered herself to be closest emotionally to her father, who later commented, "I got on better with Anne than with Margot, who was more attached to her mother. The reason for that may have been that Margot rarely showed her feelings and didn't need as much support because she didn't suffer from mood swings as much as Anne did."[30] The Frank sisters formed a closer relationship than had existed before they went into hiding, although Anne sometimes expressed jealousy towards Margot, particularly when members of the household criticized Anne for lacking Margot's gentle and placid nature. As Anne began to mature, the sisters were able to confide in each other. In her entry of 12 January 1944, Frank wrote, "Margot's much nicer ... She's not nearly so catty these days and is becoming a real friend. She no longer thinks of me as a little baby who doesn't count."[31]

I worked out pretty quickly certain survival tricks. That if the guards called us to line up in front of the barracks, I should hide or sneak into another barracks. The safest place I could find to hide was in the yard near the bathrooms where all the dead bodies were brought and piled up … I would get on the pile, lie down next to the dead bodies and pretend I was one of them.

That same day, Gestapo official SS Sergeant Karl Silberbauer and two Dutch police collaborators arrested the Franks; the Gestapo sent them to Westerbork transit camp on August 8. One month later, on September 4, 1944, SS and police authorities placed the Franks and the four others hiding with them on a train transport to Auschwitz-Birkenau in German-occupied Poland.

The Allied powers organised war crimes trials, beginning with the Nuremberg trials, held from November 1945 to October 1946, of 23 top Nazi officials. They were charged with four counts—conspiracy to commit crimes, crimes against peace, war crimes and crimes against humanity—in violation of international laws governing warfare.[483] All but three of the defendants were found guilty and twelve were sentenced to death.[484] Twelve Subsequent Nuremberg trials of 184 defendants were held between 1946 and 1949.[483] Between 1946 and 1949, the Allies investigated 3,887 cases, of which 489 were brought to trial. The result was convictions of 1,426 people; 297 of these were sentenced to death and 279 to life in prison, with the remainder receiving lesser sentences. About 65 percent of the death sentences were carried out.[485] Poland was more active than other nations in investigating war crimes, for example prosecuting 673 of the total 789 Auschwitz staff brought to trial.[486]

On 26 June 1933, Himmler appointed Theodor Eicke commandant of Dachau, who in 1934 was also appointed the first Inspector of Concentration Camps (CCI). In addition, the remaining SA-run camps were taken over by the SS.[14][15][16] Dachau served as both a prototype and a model for the other Nazi concentration camps. Almost every community in Germany had members who were taken there. The newspapers continuously reported on "the removal of the enemies of the Reich to concentration camps" making the general population more aware of their presence. There were jingles warning as early as 1935: "Dear God, make me dumb, that I may not come to Dachau."[17]