The first known documentation of Dachau occurs in a medieval deed issued by the Noble Erchana of Dahauua to the prince-bishop of Freising[3], both descendants of the lineage of the Aribonids. With this deed, dated to August 15, 805 A.D. (the Feast of the Assumption of the Blessed Virgin Mary), she donated her entire property in Dachau, including five so-called Colonenhöfe and some serfs and bondsman, to devolve to the Bishop of the Diocese of Freising after her death.

At this point, we must remember that some survivors were unable to return to "normal" life after the trauma of the Holocaust. Among this group were survivors who committed suicide, survivors who experienced severe psychological scarring, survivors who were unable to marry or have children, and others who suffered from a host of problems after the Holocaust. What is remarkable is that these were the minority, and that most Holocaust survivors were able to bring a certain degree of order to their chaotic world.
The camp administration was located in the gatehouse at the main entrance. The camp area had a group of support buildings, containing the kitchen, laundry, showers, and workshops, as well as a prison block (Bunker). The courtyard between the prison and the central kitchen was used for the summary execution of prisoners. An electrified barbed-wire fence, a ditch, and a wall with seven guard towers surrounded the camp.
Yugoslavia and Greece were invaded in April 1941 and surrendered before the end of the month. Germany and Italy divided Greece into occupation zones but did not eliminate it as a country. Yugoslavia, home to around 80,000 Jews, was dismembered; regions in the north were annexed by Germany and regions along the coast made part of Italy. The rest of the country was divided into the Independent State of Croatia, nominally an ally of Germany, and Serbia, which was governed by a combination of military and police administrators.[167] According to historian Jeremy Black, Serbia was declared free of Jews in August 1942.[168] Croatia's ruling party, the Ustashe, killed the country's Jews, and killed or expelled Orthodox Christian Serbs and Muslims.[167] Jews and Serbs alike were "hacked to death and burned in barns", according to Black. One difference between the Germans and Croatians was that the Ustashe allowed its Jewish and Serbian victims to convert to Catholicism so they could escape death.[168]

The Dachau concentration camp opened on March 22, 1933. It was the first SS-run camp for "political prisoners" under Hitler's regime and became a model for the many SS prison camps that followed. Located in southern Germany, Dachau remained open until 1945 when it was liberated by U.S. troops. Approximately 200,000 people were detained during these years and an estimated 41,500 died.
The camp administration did nothing to house the prisoners who were streaming in. Most of them had no roof over their heads, and were without water and food. There was now total chaos in Bergen- Belsen and a typhus epidemic broke out, in the month of March alone 18,168 prisoners perished in the camp and the number of deaths for the period from January to mid-April 1945 was 35,000.

December 8, 1941 - In occupied Poland, near Lodz, Chelmno extermination camp becomes operational. Jews taken there are placed in mobile gas vans and driven to a burial place while carbon monoxide from the engine exhaust is fed into the sealed rear compartment, killing them. The first gassing victims include 5,000 Gypsies who had been deported from the Reich to Lodz.

In April 1943, a part of the Bergen-Belsen camp was taken over by the SS Economic-Administration Main Office (SS Wirtschafts-Verwaltungshauptamt; WVHA). It thus became part of the concentration camp system, run by the SS Schutzstaffel but it was a special case.[7] Having initially been designated a Zivilinterniertenlager ("civilian internment camp"), in June 1943 it was redesignated Aufenthaltslager ("holding camp"), since the Geneva Conventions stipulated that the former type of facility must be open to inspection by international committees.[8] This "holding camp" or "exchange camp" was for Jews who were intended to be exchanged for German civilians interned in other countries, or for hard currency.[9] The SS divided this camp into subsections for individual groups (the "Hungarian camp", the "special camp" for Polish Jews, the "neutrals camp" for citizens of neutral countries and the "Star camp" for Dutch Jews). Between the summer of 1943 and December 1944 at least 14,600 Jews, including 2,750 children and minors were transported to the Bergen-Belsen "holding" or exchange camp.[10]:160 Inmates were made to work, many of them in the "shoe commando" which salvaged usable pieces of leather from shoes collected and brought to the camp from all over Germany and occupied Europe. In general the prisoners of this part of the camp were treated less harshly than some other classes of Bergen-Belsen prisoner until fairly late in the war, due to their perceived potential exchange value.[9] However, only around 2,560 Jewish prisoners were ever actually released from Bergen-Belsen and allowed to leave Germany.[9]