Heck, the French could have nipped it in 1936 if they had shown a little backbone and backed up the Versailles treaty. To quote Hitler himself:
"The forty-eight hours after the march into the Rhineland were the most nerve-racking in my life. If the French had then marched into the Rhineland we would have had to withdraw with our tails between our legs, for the military resources at our disposal would have been wholly inadequate for even a moderate resistance."
"Peace in Our Time!"
The "Peace" movements of the 1930's ending up costing Europe 40 million dead.
Today's "Peace" movements want to abandon 70% of the World's known oil reserves to the military control of Islamist fanatics in Iran actively seeking nuclear weapons, ICBM's and martyrdom.
How many millions of lives will that "Peace" cost in the future?