Originally posted by DE Calvin
It was their original plan to fight on both sides.
No it wasn't
Their original blitzcreig (Spelled terribly wrong)
was to conquer all of Western Europe quickly, and make Allies with Russia and turn on them later. They also knew that it would take a long time for the Russian War machine to mobalize and they exploited this, this is why the Russians wanted the Allied invasion to start as soon as possible, as to open up a second front.
This is why Stalingrad and D-Day were so key, if either one of them failed, the Germans would have the power to devote all resorces to one front and possible win more ground, or whatever, that may be impossible to gague what would have happened.