Over the years, Zeidel’s recalcitrance melted away. In the late 1970s, he sat for interviews with Lanzmann, a few minutes of which were included in the 1985 documentary Shoah. To Lanzmann, Zeidel confided that after his escape, he was sure he stunk of death. Later Zeidel agreed to participate in the making of Out of the Forest, a 2004 Israeli documentary about the role of Lithuanian collaborators in the mass killings at Ponar.
Beginning with the British air raids on Cologne in May of 1942, the Allies launched a strategic bombing campaign that would target cities and industrial plants across the Reich for the next three years. In the summer of 1942, Germany and its allies focused on the Soviet Union unsuccessfully. The Soviet Union gained the dominant role, which it would maintain for the rest of the war.
Deportation was the first step in the “Final Solution.” Typically, the Jews were informed that they were going to be resettled for work. Each was told to take some clothing, blankets, shoes, eating utensils (but no knife), a bowl, and some money. Rounded up, they were herded into trucks for the trip to the rail station, or were forced to walk. The rail cars were often strategically located at a distance from the passenger terminals, so that this scene would not arouse the ire of the local populace. Many who did see chose not to protest.

Dr. Mengele was nicknamed the "Angel of Death" by the prisoners because he had the face of an angel, yet he callously made selections for the gas chambers at Birkenau. He was nice to the children in the camp, yet he experimented on them as though they were laboratory rats. He volunteered to do the selections at Birkenau, even when it wasn't his turn, because he wanted to find subjects for his medical research on genetic conditions and hereditary diseases, which he had already begun before the war. He particularly wanted to find twins for the research that he had started before he was posted to Birkenau.

The SS organization also found it could profit financially from the human traffic. Upon arrival in the camps, all belongings were taken from the Jews. Foreign currency, gold, jewels and other valuables were sent to SS Headquarters of the Economic Administration. Wedding rings, eye glasses, shoes, gold fillings, clothing and even hair shorn from women also served to enrich the SS, with the proceeds funneled into secret Reichsbank accounts. Watches, clocks and pens were distributed to soldiers at the Front while clothing was given to German families.

The digging got underway the first night in February 1944, in a storeroom at the back of the bunker. To disguise their efforts, the prisoners erected a fake wall over the tunnel’s entrance, with “two boards hanging on loose nails that would come out with a good tug, making it possible to pass through,” Farber recalled in The Complete Black Book of Russian Jewry, a compilation of eyewitness testimonies, letters and other documents of the Nazi campaign against Jews in Eastern Europe published in part in 1944 and translated into English in 2001.
Several scholars have suggested that the Final Solution began in the newly formed district of Bezirk Bialystok.[48] The German army took over Białystok within days. On Friday, 27 June 1941, the Reserve Police Battalion 309 arrived in the city and set the Great Synagogue on fire with hundreds of Jewish men locked inside.[49] The burning of the synagogue was followed by a frenzy of killings both inside the homes around the Jewish neighbourhood of Chanajki, and in the city park, lasting until night time.[50] The next day, some 30 wagons of dead bodies were taken to mass graves. As noted by Browning, the killings were led by a commander "who correctly intuited and anticipated the wishes of his Führer" without direct orders.[49] For reasons unknown, the number of victims in the official report by Major Weis was cut in half.[50] The next mass shooting of Polish Jews within the newly formed Reichskommissariat Ostland took place in two days of 5–7 August in occupied Pińsk, where over 12,000 Jews died at the hands of Waffen SS,[51] not the Einsatzgruppen.[41] An additional 17,000 Jews perished there in a ghetto uprising crushed a year later with the aid of Belarusian Auxiliary Police.[52]
The killings continued uninterrupted. On 12 October 1941, in Stanisławów, some 10,000–12,000 Jewish men, women, and children were shot at the Jewish cemetery by the German uniformed SS-men and Ukrainian Auxiliary Police during the so-called "Bloody Sunday" (de).[64] The shooters began firing at 12 noon and continued without stopping by taking turns. There were picnic tables set up on the side with bottles of vodka and sandwiches for those who needed to rest from the deafening noise of gunfire.[65] It was the single largest massacre of Polish Jews in Generalgouvernement prior to mass gassings of Aktion Reinhard, which commenced at Bełżec in March 1942. Notably, the extermination operations in Chełmno had begun on 8 December 1941, one-and-a-half month before Wannsee, but Chełmno – located in Reichsgau Wartheland – was not a part of Reinhard, and neither was Auschwitz-Birkenau functioning as an extermination center until November 1944 in Polish lands annexed by Hitler and added to Germany proper.[65][66]
This was upgraded on 31 July 1941, when Hermann Goering sent an order that Heydrich should make “all necessary preparations with regard to organisational, practical and financial aspects for an overall solution to the Jewish question”. Heydrich was to “submit an overall plan… for the execution of the intended ‘Final Solution’ of the Jewish question”.
In June 1941, Mengele was posted to Ukraine, where he was awarded the Iron Cross 2nd Class. In January 1942, he joined the 5th SS Panzer Division Wiking as a battalion medical officer. After rescuing two German soldiers from a burning tank, he was decorated with the Iron Cross 1st Class, the Wound Badge in Black, and the Medal for the Care of the German People. He was declared unfit for further active service in mid-1942, when he was seriously wounded in action near Rostov-on-Don. Following his recovery, he was transferred to the headquarters of the SS Race and Settlement Main Office in Berlin, at which point he resumed his association with von Verschuer, who was now director of the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics. Mengele was promoted to the rank of SS-Hauptsturmführer (captain) in April 1943.[20][21][22]