What was the biggest mistake made during WWII?

[in48092]

one could argue that the german mistake in russia was not going there, but not commiting enough rescources. if my limited knowledge is correct, early in the war the germans were on the outskirts of moscow while stalin was holed up in the city. if zee germans had rolled on moscow with more troops etc... taken the city, and killed stalin it is entirely conceivable that russia would have fallen. if this had happened the germans would have had far more rescources with which to fight the war. if russia had fallen zee germans could have controlled the oil fields in the caucases as well as possibly drawing from russian manpower.
in short, maybe the german mistake wasn't invading russia. maybe it was not throwing more rescourses into the eastern front.