Before reaching the concentration camp, the 45th Thunderbird Division had discovered an abandoned train, with no engine, on a branch railroad line which at that time ran from the Dachau station along Freisinger Street in the direction of the camp. Inside the 39 train cars were the corpses of prisoners who had been evacuated from Buchenwald on April 7, 1945 and, because of heavy bombing and strafing by Allied planes in the last days of the war, had not reached Dachau until three weeks later, two days before the American soldiers arrived.

At the three Reinhard camps the victims were killed by the exhaust fumes of stationary diesel engines.[279] Gold fillings were pulled from the corpses before burial, but the women's hair was cut before death. At Treblinka, to calm the victims, the arrival platform was made to look like a train station, complete with fake clock.[300] Majdanek used Zyklon-B gas in its gas chambers.[301] In contrast to Auschwitz, the three Reinhard camps were quite small.[302] Most of the victims at these camps were buried in pits at first. Sobibór and Bełżec began exhuming and burning bodies in late 1942, to hide the evidence, as did Treblinka in March 1943. The bodies were burned in open fireplaces and the remaining bones crushed into powder.[303]
In early 1937, the SS, using prisoner labor, began construction of a large complex of buildings on the grounds of the original camp. Prisoners were forced to do this work, starting with the destruction of the old munitions factory, under terrible conditions. The construction was officially completed in mid-August 1938 and the camp remained essentially unchanged until 1945. Dachau thus remained in operation for the entire period of the Third Reich.
Many healthy, young strong Jews were not killed immediately. The Germans' war effort and the “Final Solution” required a great deal of manpower, so the Germans reserved large pools of Jews for slave labor. These people, imprisoned in concentration and labor camps, were forced to work in German munitions and other factories, such as I.G. Farben and Krupps, and wherever the Nazis needed laborers. They were worked from dawn until dark without adequate food and shelter. Thousands perished, literally worked to death by the Germans and their collaborators.
Some of the inmates were exempt from work because they were too old or too young, but a few of the older prisoners worked on the herb farm. According to Paul Berben, "Statistics made by the camp administration on 16th February 1945 list 2,309 men and 44 women aged between 50 and 60 and 5,465 men and 12 women over 60." These figures are for the main camp at Dachau and all the subcamps.

... In Bergen-Belsen, for example, thousands of corpses of Jewish prisoners were found by British soldiers on the day of liberation, which gave the impression that this was one of the notorious extermination camps. Actually, many Jews in Bergen-Belsen as well as in the satellite camps of Dachau died in the last weeks before the end of the war as a result of the quickly improvised retransfers and evacuations of Jewish workers from the still existing ghettos, work camps and concentration camps in the East (Auschwitz) ...
By late 1938, the Nazis could claim an impressive series of successes. Germany had staged the 1936 Olympics, annexed Austria and part of Czechoslovakia, and was in the midst of a strong economic recovery fuelled by rearmament. These triumphs had increased the Nazis' popularity and their confidence. President Hindenburg had died and all opposition parties had been abolished. The last conservatives in the cabinet had been replaced by Nazis. The way was clear for radical action.
Mr. Le Drieullenac said that as he helped to drag the bodies he noticed many had wounds at the top of the thigh. “First I thought they were gunshot wounds,” he told. the court to-day. “Then I saw that they could not be and a friend told me that men were cutting bits out of the bodies to eat them. When I went into the but to another body I saw a man take a knife and, looking to see if he was unobserved, cut a piece of flesh from the body and put it in his mouth. You can imagine the condition to which the men had been reduced to run the risk of eating flesh taken from a body turned black.”

On 24 April 1945, just days before the U.S. troops arrived at the camp, the commandant and a strong guard forced between 6,000 and 7,000 surviving inmates – on a death march from Dachau south to Eurasburg, then eastwards towards the Tegernsee; liberated two days after Hitler's death by a Nisei-ethnicity U.S. Army artillery battalion.[43] Any prisoners who could not keep up on the six-day march were shot. Many others died of exhaustion, hunger and exposure.[44] Months later a mass grave containing 1,071 prisoners was found along the route.[45][46]
Peter Hayes (How Was It Possible? A Holocaust Reader, 2015): "The Holocaust, the Nazi attempt to eradicate the Jews of Europe, has come to be regarded as the emblematic event of Twentieth Century ... Hitler's ideology depicted the Jews as uniquely dangerous to Germany and therefore uniquely destined to disappear completely from the Reich and all territories subordinate to it. The threat posted by supposedly corrupting but generally powerless Sinti and Roma was far less, and therefore addressed inconsistently in the Nazi realm. Gay men were defined as a problem only if they were German or having sex with Germans or having sex with Germans and considered 'curable' in most cases. ... Germany's murderous intent toward the handicapped inhabitants of European mental institutions ... was more comprehensive ... but here, too, implementation was uneven and life-saving exceptions permitted, especially in Western Europe. Not only were some Slavs—Slovaks, Croats, Bulgarians, some Ukrainians—allotted a favored place in Hitler's New Order, but the fate of most of the other Slavs the Nazis derided as sub-humans ... consisted of enslavement and gradual attrition, not the prompt massacre meted out to the Jews after 1941."[20]
In August 1944 a new section was added, to serve as a women’s camp, consisting of twelve barracks, 4,000 Jewish women prisoners from Hungary and Poland were brought there, but after a short stay they were sent to Buchenwald and Flossenburg camps, to perform forced labour. Most of the women returned to Bergen-Belsen sick or exhausted by the hard labour that they had been forced to do.
Once Germany took over Poland in 1939, it created forced-labor camps. Thousands of prisoners died from working conditions, exhaustion, and starvation. After the outbreak of World War II, the number of concentration camps increased exponentially. The number of prisoners of war camps also rose, but after the first years of the war most were converted into concentration camps. Nazis forcibly relocated Jews from ghettos to concentration camps.

More than 9,000 Jews with citizenship papers or passports from Latin American countries, entry visas for Palestine, or other documents making them eligible for emigration, arrived in late 1943 and 1944 from Poland, France, Holland and other parts of Europe. During the final months of the war, several groups of these "exchange Jews" were transported from Axis-occupied Europe. German authorities transferred several hundred to neutral Switzerland, and at least one group of 222 Jewish detainees was transferred from Belsen (by way of neutral Turkey) to British-controlled Palestine. /2

September 21, 1939 - Heydrich issues instructions to SS Einsatzgruppen (special action squads) in Poland regarding treatment of Jews, stating they are to be gathered into ghettos near railroads for the future "final goal." He also orders a census and the establishment of Jewish administrative councils within the ghettos to implement Nazi policies and decrees.

When British and Canadian troops finally entered they found over 13,000 unburied bodies and (including the satellite camps) around 60,000 inmates, most acutely sick and starving. The prisoners had been without food or water for days before the Allied arrival, partially due to allied bombing. Immediately before and after liberation, prisoners were dying at around 500 per day, mostly from typhus.[18] The scenes that greeted British troops were described by the BBC's Richard Dimbleby, who accompanied them:
The workers who constructed the original buildings were housed in camps near Fallingbostel and Bergen, the latter being the so-called Bergen-Belsen Army Construction Camp.[1] Once the military complex was completed in 1938/39, the workers' camp fell into disuse. However, after the German invasion of Poland in September 1939, the Wehrmacht began using the huts as a prisoner of war (POW) camp.