On June 22,Hitler violated the non-aggression pact with Joseph Stalinsending a massive army of German troops into the Soviet Union.
By March of the Allies had defeated much of the German army. He promised Germany that if he became leader he would restore Germany to greatness in Europe.
He returned to Vienna again when his mother died, living first with a more successful friend Kubizek and then moving from hostel to hostel as a lonely, vagabond figure. In response, Britain and France declared war on Germany two days later.
In his speech to the German parliament on March 23,he acknowledged the Christian churches as important institutions in the preservation of the German people, and he called it the basis of morality; still, he stopped short of identifying himself or his party as essentially Christian.
Hitler was arrested and tried for high treason and sentenced to nine months in prison. Although the actual membership of the NAZI party remained quite low in this period, Hitler, through his meetings and speeches had given them a very high profile.
However, his fatal mistake occurred in with the invasion of Russia, through which he wished to create lebensraum, or "living room. Hitler later pointed to these years as the time when he first cultivated his anti-Semitism, though there is some debate about this account.