While some of the guiding conceptions of the Blitzkrieg were tried out in Ethiopia, the results were not considered conclusive. The Ethiopians were a semi-savage people, and they lacked the modern armament and equipment necessary to offer the Italian invaders the kind of resistance essential if Blitzkrieg were to receive a real and complete battlefield test. But Spain furnished a fine proving ground. Then Albania was a dress rehearsal. And in Poland the system was put to the final proof.
By the spring of 1945, German leadership was dissolving amid internal dissent, with Goering and Himmler both seeking to distance themselves from Hitler and take power. In his last will and political testament, dictated in a German bunker that April 29, Hitler blamed the war on “International Jewry and its helpers” and urged the German leaders and people to follow “the strict observance of the racial laws and with merciless resistance against the universal poisoners of all peoples”–the Jews. The following day, he committed suicide. Germany’s formal surrender in World War II came barely a week later, on May 8, 1945.
Although effective in quick campaigns against Poland and France, mobile operations could not be sustained by Germany in later years. Strategies based on manoeuvre have the inherent danger of the attacking force overextending its supply lines, and can be defeated by a determined foe who is willing and able to sacrifice territory for time in which to regroup and rearm, as the Soviets did on the Eastern Front (as opposed to, for example, the Dutch who had no territory to sacrifice). Tank and vehicle production was a constant problem for Germany; indeed, late in the war many panzer "divisions" had no more than a few dozen tanks.[75] As the end of the war approached, Germany also experienced critical shortages in fuel and ammunition stocks as a result of Anglo-American strategic bombing and blockade. Although production of Luftwaffe fighter aircraft continued, they would be unable to fly for lack of fuel. What fuel there was went to panzer divisions, and even then they were not able to operate normally. Of those Tiger tanks lost against the United States Army, nearly half of them were abandoned for lack of fuel.[76]
The concept of blitzkrieg was formed by Prussian military tactics of the early 19th century, which recognized that victory could come only through forceful and swift action because of Prussia’s relatively limited economic resources. It had its origins with the Schwerpunktprinzip (“concentration principle”) proposed by Carl von Clausewitz in his seminal work On War (1832). Having studied generals who predated Napoleon, Clausewitz found that commanders of various armies had dispersed their forces without focused reasoning, which resulted in those forces’ being used inefficiently. So as to eliminate that wasteful use of manpower, he advocated for a concentration of force against an enemy. All employment of force should have an effective concentration in a single moment, with a single action, Clausewitz argued. Clausewitz called that concentration the Schwerpunkt (“centre of gravity”) where it was most dense, identifying it as the effective target for attack.
After Germany’s loss in WWI, the Treaty of Versailles punished Germany by placing tough restrictions on the country. The treaty made Germany take full responsibility for the war, reduced the extent of German territory, severely limited the size and placement of their armed forces, and forced Germany to pay the allied powers reparations. These restrictions not only increased social unrest but, combined with the start of the Great Depression, collapsed the German economy as inflation rose alongside unemployment.

Despite the term blitzkrieg being coined by journalists during the Invasion of Poland of 1939, historians Matthew Cooper and J. P. Harris have written that German operations during it were consistent with traditional methods. The Wehrmacht strategy was more in line with Vernichtungsgedanken a focus on envelopment to create pockets in broad-front annihilation. Panzer forces were dispersed among the three German concentrations with little emphasis on independent use, being used to create or destroy close pockets of Polish forces and seize operational-depth terrain in support of the largely un-motorized infantry which followed.[81]
The logistics of the mass murder turned Germany into what Michael Berenbaum called a "genocidal state".[34] Eberhard Jäckel wrote in 1986 that it was the first time a state had thrown its power behind the idea that an entire people should be wiped out.[h] Anyone with three or four Jewish grandparents was to be exterminated,[36] and complex rules were devised to deal with Mischlinge ("mixed breeds": half and quarter Jews).[37] Bureaucrats identified who was a Jew, confiscated property, and scheduled trains to deport them. Companies fired Jews and later used them as slave labor. Universities dismissed Jewish faculty and students. German pharmaceutical companies tested drugs on camp prisoners; other companies built the crematoria.[34] As prisoners entered the death camps, they were ordered to surrender all personal property, which was catalogued and tagged before being sent to Germany for reuse or recycling.[38] Through a concealed account, the German National Bank helped launder valuables stolen from the victims.[39]

When a train carrying Jewish prisoners arrived “selections” would be conducted on the railroad platform, or ramp. Newly arrived persons classified by the SS physicians as unfit for labor were sent to the gas chambers: these included the ill, the elderly, pregnant women and children. In most cases, 70-75% of each transport was sent to immediate death. These people were not entered in the camp records; that is, they received no serial numbers and were not registered, and this is why it is possible only to estimate the total number of victims.

This is the punishment card of a prisoner in Auschwitz-Birkenau, dated 24 October 1942. In German it reads: “Trotz verbot hinter haus 7 seine Grossnotdurft verrichtete”. In English this means: “Despite being forbidden, the prisoner went behind block 7 to relieve themselves”. The prisoner would have been severely punished for going to the toilet without permission as a warning to other prisoners.
The Allies believed that 'blitzkrieg' was dependent on new technology, such as tanks and dive-bombers  © Shocked by their experience, the Allied military observers who had survived the fall of France attributed their defeat to the completely new form of warfare pioneered by the Wehrmacht - the blitzkrieg. Blitzkrieg seemed to be based around the pervasive use of new technology. After all, during the disastrous campaign in Belgium and France, it had seemed as if German tanks and aircraft were everywhere.
At Auschwitz alone, more than 2 million people were murdered in a process resembling a large-scale industrial operation. A large population of Jewish and non-Jewish inmates worked in the labor camp there; though only Jews were gassed, thousands of others died of starvation or disease. During the summer of 1944, even as the events of D-Day (June 6, 1944) and a Soviet offensive the same month spelled the beginning of the end for Germany in the war, a large proportion of Hungary’s Jewish population was deported to Auschwitz, and as many as 12,000 Jews were killed every day.
Schindler first arrived in Kraków in October 1939, on Abwehr business, and took an apartment the following month. Emilie maintained the apartment in Ostrava and visited Oskar in Kraków at least once a week.[18][19] In November 1939, he contacted interior decorator Mila Pfefferberg to decorate his new apartment. Her son, Leopold "Poldek" Pfefferberg, soon became one of his contacts for black market trading. They eventually became lifelong friends.[20]