This is an interesting topic, I am actually in the middle of watching a program called "war" and there is a minor referrence to this debate made by a British soldier. He says that any such atempt made by the allies would have been suicide.

For this reason, the under belly was chosen ( ITALY )

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The war against Russia will be such that it cannot be conducted in a knightly fashion. This struggle is one of ideologies and racial differences and will have to be conducted with unprecedented, unmerciful and unrelenting harshness. -Adolf Hitler