Adolf Hitler, a man who swept the Germans up to incredible victories, was also the main reason Germany ultimately lost the war. He refused to accept reality, took no advice from his Generals and then made poor decisions. This way he ensured a relatively quick end of Nazi Germany.
Having no luck in enticing England to join in the fight against the USSR Hitler had to look for other, less powerful countries.
Hitler saved the German army from catastrophic defeat in the winter of 1941 – 1942 when he ordered his troops to stand and fight against the Russian counter attacks after their failed operation to capture Moscow. At that point, a decision to withdraw could well have caused a total collapse of the German front and an early defeat in Russia.
The Germans were well in advance of the Allies when it came to Military Technology. Having vastly superior tanks and jet airplanes being mass produced and correctly employed should have given the Germans an edge in any battle.
However, the quest for ever heavier tanks instead of concentrating on the mass production of the good designs like the Panther tank left the Germans with a wide array of tanks, each requiring different spare parts and expertise.
On December 11, 1941, Germany declared war on the United States, in response to what was claimed to be a series of provocations by the United States when they were still neutral. This occurred 4 days after December 7, 1941 when the Empire of Japan launched its surprise attack on Pearl Harbor.
In December 1941 when the attack on Moscow stalled, the Soviets launched a massive counterattack which threatened to rout the Germans bringing them to the brink of disaster.
Hitler did not wish to accept the facts, and he began removing officers from their command for not obeying orders or when they proposed to withdraw.
Hitler was certain of a quick victory over the USSR, saying to his Generals “We have only to kick in the door, and the whole rotten structure will come crashing down.” Since victory would be achieved before winter set in, there was no need to prepare for the Russian winter.
Fully aware of the urgency to launch the assault on the USSR right after the thaw ended and Russian roads became passable again, Germany ended up bailing out Italy in their misadventure in Greece.
This military operation caused a 6-week delay of the attack on Russia. This delay meant that first the autumn rains and then winter arrived before Operation Barbarossa could be completed and the Russians destroyed.
One of the costliest battles ever fought in a war, the Battle of Stalingrad became a turning point for the second world war. Driving for the oil fields in the Caucasus the German 6th Army could have bypassed or surround the city to take care of it later.
The Soviets recovered 250,000 German and Romanian corpses in and around Stalingrad, and total Axis casualties (Germans, Romanians, Italians, and Hungarians) are believed to have been more than 800,000 dead, wounded, missing, or captured. Of the 91,000 men who surrendered, only some 5,000–6,000 ever returned to their homelands (the last of them a full decade after the end of the war in 1945); the rest died in Soviet prison and labour camps. On the Soviet side, official Russian military historians estimate that there were 1,100,000 Red Army dead, wounded, missing, or captured in the campaign to defend the city. An estimated 40,000 civilians died as well. Stalingrad was the begin of the end for Germany.
Hitler’s prime target had always been Russia but to secure Germany’s western flank and avoid a war on two fronts Germany decided to attack France and Britain first.