As early as December 1940 Adolf Hitler had discussed with his generals of his plan for Operation Barbarossa, which was 'to crush Soviet Russia in a rapid campaign. With failure at Britain, Hitler decided to move east, which would soon provide enough "unlimited" resources, to do another invasion of Britain. Hitler's remarks to his generals on 22 June, he said, "When Barbarossa opens, the world will hold its breath."
Some 3 million soldiers, 3000 tanks, and 2000 planes will pour into the Soviet Territory. There were 3 divided parts, that separated the German army, one group called 'North' would move north-west moving into the Baltic states and Leningrad, Group 'South' would move southwards into Crimea and taking control over the rich agriculture Ukraine, and Group 'Centre' lead by panzer tanks would move straight to Moscow.
The Germans with twice the amount of allies than when Germany had started the war. Romanian Forces would advance from the south along with, Italian, Croatian, Hungarian, and Slovakian, divisions. The Finns decided to join with Germany. The Finns advanced from the North, in order to gain back their reputation, and retrieving their loss with Russia. This largest advancement or invasion in other words was the largest the world had yet seen.
Stalin had helped Germany by supplying them with food, fuel and materials. The last shipment was the day before. Stalin was struck, and on 3 July Stalin got onto the radio sounding sombre had addressed to his nation saying, "Our country has entered into a life and death struggle with its most wicked enemy."
Stalin ordered his country to do a scorched earth policy, which was to burn, destroy, wreck peoples own homes and farmlands to deny the Nazi advancement and Guerrilla warfare to be used. Many Russian soldiers and citizens followed the orders and fought back their hardest. Germany kept plowing through, like the Russians were nothing.
By three months had concluded which Hitler believed all of Russia was going to be his by autumn, which didn't happen. Fortunately, how the Russians acted they were able to slow down the Nazi's. Then winter hit, which concluded Germany's chance of victory.
Hitler's belief in gaining Russia for it's resources was probably a smart bold move, but also a reckless one. If Hitler invaded in the early parts of spring, he most likely would have won the war.
http://m.youtube.com/watch?v=RePOWFtsInw
Booth, Owen, and John Walton. The Illustrated History of World War II. Edison, NJ: Chartwell, 1998. Print.