Re: D-Day: 6 June 1944
By attacking Russia, Germany blundered by starting two fronts. They over stretched their resources.
It was here that the roots of the 'cold war' of the 50's & 60's was laid, with Britian & US watching from the sidelines as Russia was being bled white. They kept making excuses & did nothing to relieve the presure on Russia.
Hitler had underestimated Russia. Russia lost over 20 million people, and eventually defeated Germany & captured Berlin.
Not too much credit is given to Russian contribution on winning the WW2, the reality is they turned the tide against the Germans by defeating them in Stalingrad, and thereby destroyed the myth of german invincibility. "Quantity over Quality".