Many of the former SS staff who survived the typhus epidemic were tried by the British at the Belsen trial. Over the period in which Bergen-Belsen operated as a concentration camp, at least 480 people had worked as guards or members of the commandant's staff, including around 45 women. From September 17 to November 17, 1945, 45 of those were tried by a military tribunal in Lüneburg. They included former commandant Josef Kramer, 16 other SS male members, 16 female SS guards and 12 former kapos (one of whom became ill during the trial). Among them were Irma Grese, Elisabeth Volkenrath, Hertha Ehlert, Ilse Lothe [de], Johanna Bormann and Fritz Klein. Many of the defendants were not just charged with crimes committed at Belsen but also earlier ones at Auschwitz. Their activities at other concentration camps such as Mittelbau-Dora, Ravensbrück, Neuengamme, the Gross Rosen subcamps at Neusalz and Langenleuba, and the Mittelbau-Dora subcamp at Gross Werther were not subject of the trial. It was based on British military law and the charges were thus limited to war crimes. Substantial media coverage of the trial provided the German and international public with detailed information on the mass killings at Belsen as well as on the gas chambers of Auschwitz-Birkenau.
Immediately after the war, Erich Preuss, a former Dachau prisoner, set up an exhibit in the crematory building, located just outside the barbed wire enclosure of the concentration camp. American soldiers stationed in Germany were brought to Dachau to see the gas chamber, which they were told had been used to murder innocent inmates of the concentration camp. Mannequins were used in a display that was set up to illustrate how the Dachau prisoners were punished on the whipping block. During this time, the former concentration camp itself was off limits to visitors because it was filled with accused German war criminals awaiting the proceedings of the American Military Tribunals at Dachau, and later by homeless German refugees.
On April 15, 1945, Bergen-Belsen was liberated by the Allied 21st Army Group, a combined British-Canadian unit. At the time of liberation, the camp had been without food or water for three to five days. As Matthew Nesbitt, a Canadian liberator, recounted, "…the first thing we had to do when we got to camp. Prior to even distributing the food. And that was to make sure we used the guards to separate the living from the dead, from the huts, because first of all, if we are going to save anybody, we had to know who was alive and who had to be buried…The only way you could do that was to go into each individual hut and shake whoever was on that little slab…if they didn't move, they were dead."
Hitler’s worldview revolved around two concepts: territorial expansion (that is, greater Lebensraum—“living space”—for the German people) and racial supremacy. After World War I the Allies denied Germany colonies in Africa, so Hitler sought to expand German territory and secure food and resources—scarce during World War I—in Europe itself. Hitler viewed the Jews as racial polluters, a cancer on German society in what has been termed by Holocaust survivor and historian Saul Friedländer “redemptive anti-Semitism,” focused on redeeming Germany from its ills and ridding it of a cancer on the body politic. Historian Timothy Snyder characterized the struggle as even more elemental, as “zoological,” and “ecological,” a struggle of the species. Hitler opposed Jews for the values they brought into the world. Social justice and compassionate assistance to the weak stood in the way of what he perceived as the natural order, in which the powerful exercise unrestrained power. In Hitler’s view, such restraint on the exercise of power would inevitably lead to the weakening, even the defeat, of the master race.
In 1935 the Wehrmacht began to build a large military complex close to the village of Belsen, a part of the town of Bergen, in what was then the Province of Hanover. This became the largest military training area in Germany of the time and was used for armoured vehicle training. The barracks were finished in 1937. The camp has been in continuous operation since then and is today known as Bergen-Hohne Training Area. It is used by the NATO armed forces.