A column of inmates reached the Gross-Rosen complex. Throughout February, the terribly overcrowded main camp at Gross-Rosen was cleared, and all 44,000 inmates were moved further west. An unknown number died in this last journey.[244] In March 1945, Himmler ordered that no more prisoners should be killed, as he hoped to use them as hostages in negotiations with the Allies.[245] Approximately 20,000 Auschwitz prisoners made it to Bergen-Belsen, where they were liberated by the British in April 1945.[246]
Killing on a mass scale using gas chambers or gas vans was the main difference between the extermination and concentration camps.[269] From the end of 1941, the Germans built six extermination camps in occupied Poland: Auschwitz II-Birkenau, Majdanek, Chełmno, and the three Operation Reinhard camps at Belzec, Sobibor, and Treblinka II.[44][270] Maly Trostenets, a concentration camp in the Reichskommissariat Ostland, became a killing centre in 1942.[44] Gerlach writes that over three million Jews were murdered in 1942, the year that "marked the peak" of the mass murder of Jews.[271] At least 1.4 million of these were in the General Government area of Poland.[272]
Auschwitz-Birkenau was the largest Nazi extermination and concentration camp, located in the Polish town of Oswiecim, 37 miles west of Cracow. One sixth of all Jews murdered by the Nazis were gassed at Auschwitz. In April 1940 SS chief Heinrich Himmler ordered the establishment of a new concentration camp in Oswiecim, a town located within the portion of Poland that was annexed to Germany at the beginning of World War II. The first Polish political prisoners arrived in Auschwitz in June 1940, and by March 1941 there were 10,900 prisoners, the majority of whom were Polish. Auschwitz soon became known as the most brutal of the Nazi concentration camps.
The twin pairs of gas chambers were numbered II and III, and IV and V. The first opened on March 31, 1943, the last on April 4, 1943. The total area of the gas chambers was 2,255 square meters; the capacity of these crematoria was 4,420 people. Those selected to die were undressed in the undressing room and then pushed into the gas chambers. It took about 20 minutes for all the people to death. In II and III, the killings took place in underground rooms, and the corpses were carried to the five ovens by an electrically operated lift. Before cremation gold teeth and any other valuables, such as rings, were removed from the corpses. In IV and V the gas chambers and ovens were on the same level, but the ovens were so poorly built and the usage was so great that they repeatedly malfunctioned and had to be abandoned. The corpses were finally burned outside, in the open, as in 1943. Jewish sonderkommandos worked the crematoria under SS supervision.
But the personalities and characteristics of human beings cannot be spliced. Sometimes character flaws, such as hubris, also lead to great achievements through a willingness to attempt something most people never would. Oskar’s espionage activities on behalf of Germany, while regrettable to enemies of Germany, later put him in a position to save many lives.
Following Germany's military reforms of the 1920s, Heinz Guderian emerged as a strong proponent of mechanized forces. Within the Inspectorate of Transport Troops, Guderian and colleagues performed theoretical and field exercise work. There was opposition from many officers who gave primacy to the infantry or simply doubted the usefulness of the tank. Among them was Chief of the General Staff Ludwig Beck (1935–38), who skeptical that armored forces could be decisive. Nonetheless, the panzer divisions were established during his tenure.
The majority—probably about 90%—of the victims of Auschwitz Concentration Camp died in Birkenau. This means approximately a million people. The majority, more than nine out of every ten, were Jews. A large proportion of the more than 70 thousand Poles who died or were killed in the Auschwitz complex perished in Birkenau. So did approximately 20 thousand Gypsies, in addition to Soviet POWs and prisoners of other nationalities. 
Schindler joined the separatist Sudeten German Party in 1935.[6] Although he was a citizen of Czechoslovakia, Schindler became a spy for the Abwehr, the military intelligence service of Nazi Germany, in 1936. He was assigned to Abwehrstelle II Commando VIII, based in Breslau.[7] He later told Czech police that he did it because he needed the money; by this time Schindler had a drinking problem and was chronically in debt.[8]