Blitzkrieg is vulnerable to an enemy that is robust enough to weather the shock of the attack and that does not panic at the idea of enemy formations in its rear area. This is especially true if the attacking formation lacks the reserve to keep funnelling forces into the spearhead, or lacks the mobility to provide infantry, artillery and supplies into the attack. If the defender can hold the shoulders of the breach they will have the opportunity to counter-attack into the flank of the attacker, potentially cutting off the van as happened to Kampfgruppe Peiper in the Ardennes.
Shipments of Jews to the camps had priority over anything but the army's needs on the German railways, and continued even in the face of the increasingly dire military situation at the end of 1942.[355] Army leaders and economic managers complained about this diversion of resources and the killing of skilled Jewish workers,[356] but Nazi leaders rated ideological imperatives above economic considerations.[357]
The origins of blitzkrieg are in some doubt: if it existed, who contributed to it, whether it was part of German war strategy from 1933–1939. There has been a great deal of debate about whether it existed as a coherent military strategy. Many historians[who?] now think that blitzkrieg was not a military theory and the campaigns conducted by the Germans from 1939 to circa 1942 (with the exception of Operation Barbarossa) were improvised, rather than being based on a particular military strategy. Blitzkrieg had been called a Revolution in Military Affairs (RMA) but many writers and historians have concluded that the Germans did not invent a new form of warfare but applied new technologies to traditional ideas of Bewegungskrieg (manoeuvre warfare) to achieve decisive victory.[109]

Some prisoners—usually Aryan—were assigned positions of authority, such as Blockschreiber ("block clerk"), Funktionshäftling ("functionary"), Kapo ("head" or "overseer"), and Stubendienst ("barracks orderly"). They were considered members of the camp elite, and had better food and lodgings than the other prisoners. The Kapos in particular wielded tremendous power over other prisoners, whom they often abused.[88][89] Very few Kapos were prosecuted after the war, because of the difficulty in determining which Kapo atrocities had been performed under SS orders and which had been individual actions.[90]
The resistance sent out the first oral message about Auschwitz with Dr. Aleksander Wielkopolski, a Polish engineer who was released in October 1940.[201] The following month the Polish underground in Warsaw prepared a report on the basis of that information, The camp in Auschwitz, part of which was published in London in May 1941 in a booklet, The German Occupation of Poland, by the Polish Ministry of Foreign Affairs. The report said of the Jews in the camp that "scarcely any of them came out alive". According to Fleming, the booklet was "widely circulated amongst British officials". The Polish Fortnightly Review based a story on it, writing that "three crematorium furnaces were insufficient to cope with the bodies being cremated", as did The Scotsman on 8 January 1942, the only British news organization to do so.[202]
On 15 September 1935, the Reichstag passed the Nuremberg Laws, prohibiting marriages between Jews and people of Germanic extraction, extramarital relations between Jews and Germans, and the employment of German women under the age of 45 as domestic servants in Jewish households.[12] The Reich Citizenship Law defined as citizens those of "German or kindred blood". Thus Jews and other minorities were stripped of their citizenship.[13] By the start of World War II in 1939, around 250,000 of Germany's 437,000 Jews had emigrated to the United States, Palestine, the United Kingdom, and other countries.[14][15]
Responding with alarm to Hitler’s rise, the Jewish community sought to defend their rights as Germans. For those Jews who felt themselves fully German and who had patriotically fought in World War I, the Nazification of German society was especially painful. Zionist activity intensified. “Wear it with pride,” journalist Robert Weltsch wrote in 1933 of the Jewish identity the Nazis had so stigmatized. Religious philosopher Martin Buber led an effort at Jewish adult education, preparing the community for the long journey ahead. Rabbi Leo Baeck circulated a prayer for Yom Kippur (the Day of Atonement) in 1935 that instructed Jews on how to behave: “We bow down before God; we stand erect before man.” Yet while few, if any, could foresee its eventual outcome, the Jewish condition was increasingly perilous and was expected to worsen.
As the Red Army drew nearer in July 1944, the SS began closing down the easternmost concentration camps and evacuating the remaining prisoners westward to Auschwitz and Gross-Rosen concentration camp. Göth's personal secretary, Mietek Pemper, alerted Schindler to the Nazis' plans to close all factories not directly involved in the war effort, including Schindler's enamelware facility. Pemper suggested to Schindler that production should be switched from cookware to anti-tank grenades in an effort to save the lives of the Jewish workers. Using bribery and his powers of persuasion, Schindler convinced Göth and the officials in Berlin to allow him to move his factory and his workers to Brünnlitz (Czech: Brněnec), in the Sudetenland, thus sparing them from certain death in the gas chambers. Using names provided by Jewish Ghetto Police officer Marcel Goldberg, Pemper compiled and typed the list of 1,200 Jews—1,000 of Schindler's workers and 200 inmates from Julius Madritsch's textiles factory—who were sent to Brünnlitz in October 1944.[62][63][64][65]
These gassing facilities soon proved inadequate for the task of murdering the large numbers of Jewish deportees being sent to Auschwitz. Between March and June 1943, four large crematoria were built within Auschwitz-Birkenau, each with a gas chamber, a disrobing area, and crematory ovens. Gassings ceased at Bunkers I and II when Crematoria II through V began operating, although Bunker II was put back into operation during the deportation of Hungary’s Jews in 1944. Gassing of newly arrived transports ceased at Auschwitz by early November 1944.
Birkenau was subdivided into several sections, fairly isolated from one another, and each supporting its own unique cultural scene.  There was a men’s camp, a women’s camp, and two ‘family camps’, one for Roma and Sinti, and the other for Jews brought from Theresienstadt.  Both ‘family camps’ were eventually liquidated, but before then the inmates were allowed to live in relatively better conditions than the other inmates.  They were not required to have their heads shaved, at least initially were given more generous rations and various other 'privileges', and above all were allowed to stay together as families.  Each of these mini-camps supported its own band, as well as a variety of singing, performing and instrumental groups.
The commander of Auschwitz-Birkenau, Rudolf Höss, stated in his autobiography that in 1941 (no exact date is given) he was summoned to Berlin, where Himmler informed him that Hitler had issued an order to solve the “Jewish Question” for good, and that the order was to be implemented by the SS. “The existing extermination places in the east are unsuited to a large scale, long-term action. I have designated Auschwitz for this purpose,” Himmler said.
Höss was succeeded as Auschwitz commandant in November 1943 by SS Obersturmbannführer Arthur Liebehenschel, who served until 15 May 1944. SS Sturmbannführer Richard Baer became commandant of Auschwitz I on 11 May 1944, and SS Obersturmbannführer Fritz Hartjenstein of Auschwitz II from 22 November 1943, followed by SS Obersturmbannführer Josef Kramer from 15 May 1944 until the camp's liquidation in January 1945. Heinrich Schwarz was commandant of Auschwitz III from the point at which it became an autonomous camp in November 1943 until its liquidation.[83]
In the German parliament, the Nazi party, led by Adolf Hitler, gained popularity. The number of seats Nazis controlled in the parliament rose from 12 in 1928 to 230 in 1932, making them the largest political party. The strong showing guaranteed the Nazi party would need to be part of any political coalition. Believing he could check Hitler’s ambition, President Hindenburg reluctantly made Hitler the Chancellor of Germany on January 30, 1933.
From the earliest years of the Nazi regime, German authorities persecuted homosexuals and others whose behavior did not match prescribed social norms. German police officials targeted thousands of political opponents (including Communists, Socialists, and trade unionists) and religious dissidents (such as Jehovah's Witnesses). Many of these individuals died as a result of incarceration and maltreatment.
Guderian expressed a hearty contempt for General Ludwig Beck, chief of the General Staff from 1935 to 1938, whom he characterized as hostile to ideas of modern mechanised warfare: [Corum quoting Guderian] "He [Beck] was a paralysing element wherever he appeared....[S]ignificantly of his way of thought was his much-boosted method of fighting which he called delaying defence". This is a crude caricature of a highly competent general who authored Army Regulation 300 (Troop Leadership) in 1933, the primary tactical manual of the German Army in World War II, and under whose direction the first three panzer divisions were created in 1935, the largest such force in the world of the time.[153]

Auschwitz-Birkenau, the largest of the concentration and extermination camps established on Polish soil, served concurrently as a labor camp and as a center for the rapid extermination of Jews. Chosen as the central location for the annihilation of the Jewish people, it was equipped with several extermination facilities and crematoria. Extermination was carried out by means of Zyklon B gas, a substance that had previously been tested on Russian prisoners of war.

Using gas vans, Chełmno had its roots in the Aktion T4 euthanasia program.[273] Majdanek began as a POW camp, but in August 1942 it had gas chambers installed.[274] A few other camps are occasionally named as extermination camps, but there is no scholarly agreement on the additional camps; commonly mentioned are Mauthausen in Austria[275] and Stutthof.[276] There may also have been plans for camps at Mogilev and Lvov.[277]

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]