Hitler's going crazy.

Hitler is very hard to figure out, he helped Germany in many ways. He brought them out of a recession, he rebuilt there military, and he unified Germany. But he's killing his troops by telling them to keep moving forward even though there chance to succeed is nearly impossible. Hitler should have listened to his generals advice, but he seems to be blind.

Winter vs Germans

When the Germans were invading russia they encountered very harsh weather. Due to the weather, the Germans were taking many loses. Hitler didn't listen to the general's advice, he continued to send troops forward even though they were running low on supplies, and the troops weren't properly equipped for the cold weather. This concludes the Germans retreating and failing to invade Moscow.