The six killing sites, chosen because of their closeness to rail lines and their location in semirural areas, were at Belzec, Sobibor, Treblinka, Chelmno, Majdanek, and Auschwitz-Birkenau. Chelmno was the first camp in which mass exterminations were carried out by gas piped into mobile gas vans. At least 152,000 persons were killed there between December 1941 and March 1943, and between June and July 1944. A killing center using gas chambers operated at Belzec, where about 600,000 persons were killed between May 1942 and August 1943. Sobibor opened in May 1942 and closed following a rebellion of prisoners on October 14, 1943; about 250,000 persons had already been killed by gassing at Sobibor. Treblinka opened in July 1942 and closed in November 1943. A revolt by prisoners in early August 1943 destroyed much of that facility. At least 750,000 persons were killed at Treblinka, physically the largest of the killing centers. Almost all of the victims at Chelmno, Belzec, Sobibor, and Treblinka were Jews; a few were Roma (Gypsies), Poles, and Soviet POWs. Very few individuals survived these four killing centers where most victims were murdered immediately upon arrival.
Auschwitz-Birkenau, which also served as a concentration camp and slave labor camp, became the killing center where the largest numbers of European Jews and Roma (Gypsies) were killed. After an experimental gassing there in September 1941--of 250 malnourished Polish prisoners and 600 Soviet POWs--mass murder became a daily routine. More than one million people were killed at Auschwitz-Birkenau, 9 out of 10 of them Jews. In addition, Roma, Soviet POWs, and ill prisoners of all nationalities died in the gas chambers there. Between May 15 and July 9, 1944, nearly 440,000 Jews were deported from Hungary on more than 140 trains, overwhelmingly to Auschwitz. This was probably the largest single mass deportation during the Holocaust. A similar system was implemented at Majdanek, which also doubled as a concentration camp, and where between 70,000 and 235,000 persons were killed in the gas chambers or died from malnutrition, brutality, and disease.
The Germans carried out their systematic murderous activities with the help of local collaborators in many countries and the acquiescence or indifference of millions of bystanders. However, there were instances of organized resistance. For example, in the fall of 1943, the Danish resistance, with the support of the local population, rescued nearly the entire Jewish community in Denmark by smuggling them via a dramatic boatlift to safety in neutral Sweden. Individuals in many other countries also risked their lives to save Jews and other individuals subject to Nazi persecution. One of the most famous was Raoul Wallenberg, a Swedish diplomat, who played a significant role in some of the rescue efforts that saved tens of thousand of Hungarian Jews in 1944.
Resistance existed in almost every concentration camp and ghetto of Europe. In addition to the armed revolts at Sobibor and Treblinka, Jewish resistance in the Warsaw ghetto led to a courageous uprising in April and May 1943, despite a predictable doomed outcome because of superior German force. In general, rescue or aid to Holocaust victims was not a priority of resistance organizations, whose principle goal was to fight the war against the Germans. Nonetheless, such groups and Jewish partisans (resistance fighters) sometimes cooperated with each other to save Jews. On April 19, 1943, for example, members of the National Committee for the Defense of Jews, in cooperation with Christian railroad workers and the general underground in Belgium, attacked a train leaving the Belgian transit camp of Malines headed for Auschwitz, and succeeded in assisting Jewish deportees to escape.
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