In early 1943, encouraged by von Verschuer, Mengele applied to transfer to the concentration camp service. His application was accepted and he was posted to Auschwitz, where he was appointed by SS-Standortarzt Eduard Wirths, chief medical officer at Auschwitz, to the position of chief physician of the Zigeunerfamilienlager (Romani family camp) at Birkenau, a subcamp located on the main Auschwitz complex. The SS doctors did not administer treatment to the Auschwitz inmates, but supervised the activities of inmate doctors who had been forced to work in the camp medical service. As part of his duties, Mengele made weekly visits to the hospital barracks and ordered any prisoners who had not recovered after two weeks in bed to be sent to the gas chambers.
The first major camp to be encountered by Allied troops, Majdanek, was discovered by the advancing Soviets on 25 July 1944. Treblinka, Sobibór, and Bełżec were never liberated, but were destroyed by the Germans in 1943. Auschwitz was liberated, also by the Soviets, on 27 January 1945; Buchenwald by the Americans on 11 April; Bergen-Belsen by the British on 15 April; Dachau by the Americans on 29 April; Ravensbrück by the Soviets on 30 April; and Mauthausen by the Americans on 5 May. The Red Cross took control of Theresienstadt on 4 May, days before the Soviets arrived.
Before the “Final Solution” was devised to murder all Jews in Nazi jurisdiction, the scheme the Nazis planned to rid their land of the Jews was forced emigration. In 1940, plans were devised by the Nazis to ship all Jews under Nazi control to Madagascar, an island in the Indian Ocean. It was not until 1941 that Nazi bureaucrats were referring to the “Final Solution” (Gesamtlosung) in the context of genocide rather than a “Territorial Final Solution” (territoriale Endlosung) in the context of forced emigration. Some historians believe that the Madagascar Plan was a smokescreen for Hitler’s desire to murder European Jewry (see page 62 of Marrus’ The Holocaust in History).
A subsidiary aim of Operation Reinhard was to exploit a small minority of Jews residing in the Generalgouvernement as forced laborers before killing them. As the ghettos in Poland were systematically liquidated, those selected to live temporarily were deported to Operation Reinhard labor camps and to the concentration camp Lublin/Majdanek. This camp was established in 1941 under the authority of the Inspectorate of Concentration Camps in Berlin. Though conceived of and functioning in practice primarily as a concentration camp, housing political prisoners and Jewish forced laborers, Majdanek served from time to time as a killing site for Jews residing in the Generalgouvernement. It had gas chambers, in which the SS killed tens of thousands of Jews, primarily forced laborers too weak to work.
Anne's already budding literary ambitions were galvanized on 29 March 1944 when she heard a London radio broadcast made by the exiled Dutch Minister for Education, Art, and Science, Gerrit Bolkestein, calling for the preservation of "ordinary documents—a diary, letters ... simple everyday material" to create an archive for posterity as testimony to the suffering of civilians during the Nazi occupation. On May 20, 1944, she notes that she started re-drafting her diary with future readers in mind. She expanded entries and standardized them by addressing all of them to Kitty, clarified situations, prepared a list of pseudonyms, and cut scenes she thought would be of little interest or too intimate for general consumption. By the time she started the second existing volume, she was writing only to Kitty.
The Germans invaded the Soviet Union in 1941. Leaders of the SS and police and leaders of the German armed forces had concluded pre-invasion agreements. In accordance with these agreements, SS and police units—including Einsatzgruppen of the German Security Police and SD and battalions of the German Order Police—followed German troops into newly occupied Soviet territory. Acting as mobile killing units, they conducted shooting operations aimed at annihilating entire Jewish communities. By autumn 1941, the SS and police introduced mobile gas vans. These paneled trucks had exhaust pipes reconfigured to pump poisonous carbon monoxide gas into sealed spaces, killing those locked within. They were designed to complement ongoing shooting operations.
In 1942, Auschwitz II (Birkenau), originally intended to house slave laborers, began to be used instead as a combined labor camp and extermination camp. Prisoners were transported there by rail from all over German-occupied Europe, arriving in daily convoys. By July 1942, SS doctors were conducting "selections" where incoming Jews were segregated, and those considered able to work were admitted into the camp while those deemed unfit for labor were immediately killed in the gas chambers. The arrivals that were selected to die, about three-quarters of the total,[a] included almost all children, women with small children, pregnant women, all the elderly, and all of those who appeared (in a brief and superficial inspection by an SS doctor) to be not completely fit and healthy.