From 1933 until 1938, most of the people held in concentration camps were political prisoners and people the Nazis labeled as "asocial." These included the disabled, the homeless, and the mentally ill. After Kristallnacht in 1938, the persecution of Jews became more organized. This led to the exponential increase in the number of Jews sent to concentration camps.
Schindler started out as a wartime profiteer, having acquired an enamelware factory in Poland in 1939. At the height of his business, Schindler had 1,750 workers under his employment — 1000 of them Jewish. Over time, his daily interactions with his Jewish workers prompted him to use his political connections as a former German spy and his wealth to bribe Nazi officers to prevent his workers from being deported and killed. Through various Jewish administrators came what was known as "Schindler's List," although in reality, there were nine separate lists and Schindler, at the time, did not oversee the details since he was incarcerated for suspicion of bribery.
Birkenau was created in 1941 as a satellite of the Auschwitz camp. The village of Brzezinka was evacuated for this purpose, and a handful of farm buildings were woven into the structure of the camp. This was even the case with the main gas chambers, which were located at the northern end of the site, where the railway tracks meet their end. Transits of prisoners were brought here from across Europe, and it was here that the 'Final Solution' was conducted at its most relentless level.
In the summer of 1942, Germany launched another offensive in the southern USSR against Stalingrad and the Caucasus, the Soviets again lost tremendous amounts of territory, only to counter-attack once more during winter. German gains were ultimately limited by Hitler diverting forces from the attack on Stalingrad and driving towards the Caucasus oilfields simultaneously. The Wehrmacht became overstretched, although winning operationally, it could not inflict a decisive defeat as the durability of the Soviet Union's manpower, resources, industrial base and aid from the Western Allies began to take effect.[95]

Nazi racial policy aimed at forcing Jews to emigrate.[109] Fifty thousand German Jews had left Germany by the end of 1934,[110] and by the end of 1938, approximately half the German Jewish population had left the country.[109] Among the prominent Jews who left was the conductor Bruno Walter, who fled after being told that the hall of the Berlin Philharmonic would be burned down if he conducted a concert there.[111] Albert Einstein, who was in the United States when Hitler came to power, never returned to Germany; he was expelled from the Kaiser Wilhelm Society and the Prussian Academy of Sciences and his citizenship was revoked.[112] Other Jewish scientists, including Gustav Hertz, lost their teaching positions and left the country.[113] On 12 March 1938, Germany annexed Austria. Austrian Nazis broke into Jewish shops, stole from Jewish homes and businesses, and forced Jews to perform humiliating acts such as scrubbing the streets or cleaning toilets.[114] Jewish businesses were "Aryanized", and all the legal restrictions on Jews in Germany were imposed.[115] In August that year, Adolf Eichmann was put in charge of the Central Agency for Jewish Emigration in Vienna (Zentralstelle für jüdische Auswanderung in Wien). About 100,000 Austrian Jews had left the country by May 1939, including Sigmund Freud and his family, who moved to London.[116] The Évian Conference was held in July 1938 by 32 countries as an attempt to help the increased refugees from Germany, but aside from establishing the largely ineffectual Intergovernmental Committee on Refugees, little was accomplished and most countries participating did not increase the number of refugees they would accept.[117]
As was the case in other camps, the primary form of voluntary music-making in Birkenau was singing.  Due to its size and international composition, there were inmates from all over Europe whose voices survivors remembered.  Prisoners sang to comfort one another, to build solidarity and to express resistance.  The former inmate Kitty Hart remembered that
During the war, Emilie joined Oskar in Krakow, and by the war’s end, the couple was penniless, having used his fortune to bribe authorities and save his workers. The day after the war ended, Schindler and his wife fled to Argentina with the help of the Schindlerjuden to avoid prosecution for his previous spying activities. For more than a decade, Schindler tried farming, only to declare bankruptcy in 1957. He left his wife and traveled to West Germany, where he made an unsuccessful attempt in the cement business. Schindler spent the rest of his life supported by donations from the Schindlerjuden. He was named a Righteous Gentile by Yad Vashem in 1962, and after his death in 1974, at age 66, Oskar Schindler was interred in the Catholic cemetery on Mount Zion in Jerusalem. In 1993, Steven Spielberg brought the story of Oskar Schindler to the big screen with his film, Schindler's List.
"...(t)hroughout ( the Polish Campaign), the employment of the mechanized units revealed the idea that they were intended solely to ease the advance and to support the activities of the infantry....Thus, any strategic exploitation of the armored idea was still-born. The paralysis of command and the breakdown of morale were not made the ultimate aim of the ... German ground and air forces, and were only incidental by-products of the traditional maneuvers of rapid encirclement and of the supporting activities of the flying artillery of the Luftwaffe, both of which had has their purpose the physical destruction of the enemy troops. Such was the Vernichtungsgedanke of the Polish campaign."
At dawn on 10 May, the Germans began an invasion of Belgium and the Netherlands. Accordingly, convinced that they were facing a repeat of the German strategy of 1914, Allied commanders moved the bulk of their forces from the Franco-Belgian border into defensive positions within Belgium to await the continuation of the German attack. In so doing, they fell right into Hitler's trap.
Schindler’s profits were extraordinarily high because he used low-paid Jewish workers from the ghetto the Nazis established in the city. During the war, many industrialists like Schindler used the forced labor of Jews living in Nazi ghettos or concentration camps. Major German companies, including Volkswagen, Bayer, and IG Farben, the largest chemical company in the world at the time, profited handsomely from coerced labor. This labor often occurred in the worst conditions possible, and many workers died as a result of being subjected to excessively long, arduous work shifts without adequate food.

He went on to say that the use of tanks "left much to be desired...Fear of enemy action against the flanks of the advance, fear which was to prove so disastrous to German prospects in the west in 1940 and in the Soviet Union in 1941, was present from the beginning of the war." John Ellis further asserted that "...there is considerable justice in Matthew Cooper's assertion that the panzer divisions were not given the kind of strategic mission that was to characterize authentic armored blitzkrieg, and were almost always closely subordinated to the various mass infantry armies."

In 1914, German strategic thinking derived from the writings of Carl von Clausewitz (June 1, 1780 – November 16, 1831), Helmuth von Moltke the Elder (26 October 1800 – 24 April 1891) and Alfred von Schlieffen (28 February 1833 – 4 January 1913), who advocated manoeuvre, mass and envelopment to create the conditions for a decisive battle (Vernichtungsschlacht). During the war, officers such as Willy Rohr developed tactics to restore manoeuvre on the battlefield. Specialist light infantry (Sturmtruppen, "storm troops") were to exploit weak spots to make gaps for larger infantry units to advance with heavier weapons and exploit the success, leaving isolated strong points to troops following up. Infiltration tactics were combined with short hurricane artillery bombardments using massed artillery, devised by Colonel Georg Bruchmüller. Attacks relied on speed and surprise rather than on weight of numbers. These tactics met with great success in Operation Michael, the spring offensive of 1918 and restored temporarily the war of movement, once the Allied trench system had been overrun. The German armies pushed on towards Amiens and then Paris, coming within 120 kilometres (75 mi) before supply deficiencies and Allied reinforcements halted the advance.[27] Historian James Corum criticised the German leadership for failing to understand the technical advances of the First World War, having given tank production the lowest priority and having conducted no studies of the machine gun prior to that war.[28]
German volunteers first used armor in live field conditions during the Spanish Civil War of 1936. Armor commitments consisted of Panzer Battalion 88, a force built around three companies of PzKpfw I tanks that functioned as a training cadre for Nationalists. The Luftwaffe deployed squadrons of fighters, dive-bombers, and transports as the Condor Legion. Guderian called the tank deployment "on too small a scale to allow accurate assessments to be made." The true test of his "armored idea" would have to wait for the Second World War. However, the German Air Force also provided volunteers to Spain to test both tactics and aircraft in combat, including the first combat use of the Stuka.
Recognising that battlefield conditions changed rapidly and that orders often became overtaken by events, the German army encouraged its commanders to make decisions without waiting for orders from above, thus allowing them to take advantage of fleeting opportunities as they arose. Above all else, this doctrine created aggressive and flexible leaders.
In 1997 a suitcase belonging to Schindler containing historic photographs and documents was discovered in the attic of the apartment of Ami and Heinrich Staehr in Hildesheim. Schindler had stayed with the couple for a few days shortly before his death in 1974. Staehr's son Chris took the suitcase to Stuttgart, where the documents were examined in detail in 1999 by Dr. Wolfgang Borgmann, science editor of the Stuttgarter Zeitung. Borgmann wrote a series of seven articles, which appeared in the paper from 16 to 26 October 1999 and were eventually published in book form as Schindlers Koffer: Berichte aus dem Leben eines Lebensretters ; eine Dokumentation der Stuttgarter Zeitung (Schindler's Suitcase: Report on the Life of a Rescuer). The documents and suitcase were sent to the Holocaust museum at Yad Vashem in Israel for safekeeping in December 1999.[102]
Oskar Schindler (28 April 1908 – 9 October 1974) was a German industrialist and a member of the Nazi Party who is credited with saving the lives of 1,200 Jews during the Holocaust by employing them in his enamelware and ammunitions factories in occupied Poland and the Protectorate of Bohemia and Moravia. He is the subject of the 1982 novel Schindler's Ark and its 1993 film adaptation, Schindler's List, which reflected his life as an opportunist initially motivated by profit, who came to show extraordinary initiative, tenacity, courage, and dedication to save the lives of his Jewish employees.