You will have to elaborate on this Dave Ellis version of history. To my understanding, the Germans provoked the nations around them. It is a simplistic account, I know, but yours by comparison is cryptic.
In any case, turning the other cheek is no guarantee that you will never face war, I never said that. But if you cannot be provoked, you cannot be threatened either. It is therefore a very shrewd tactic in war.
Under the Treaty of Versailles Germany was limited to a very small military, I believe the army was limited to 100,000 men, the Navy was limited to a small number of ships, including absolutely no submarines and the Air force was similarly limited to a small force which would be ineffective in fighting a war of aggression. The treaty also specifically prohibited Germany from merging with Austria, and included many other restrictions designed to keep Germany from becoming a major threat to Europe again.
The politicians of the 1930s largely grew up during the WW1 era, and understandably wanted to prevent another major war at all cost. Hitler used that timidity to his full advantage.... He not only openly rebuilt the German Military, but built up one of the most impressive fighting forces the world had ever seen.
He marched troops into the demilitarized rhineland on the French Border, when the allied politicians did nothing, he annexed Austria. When the allied politicians still did nothing, he demanded the German speaking areas of the Czech Republic (the Sudetenland) and threatened to invade if they were not handed over. Not only did the allied politicians concede this land (which included all of Czechoslovakia's border defences), they didn't bother to consult the president of Czechoslovakia on the matter.
Hitler simply decided to stop paying the war reparations imposed on Germany after WW1, which were partially designed for revenge, but partially designed to keep the German economy limited.
In the end the allied politicians in their cowardice had let Hitler walk all over them in the interests of keeping the peace, until he had built up a war machine so powerful he conquered and held mainland Europe, and probably would have won if he had listened more to what his generals were telling him.
If the Allied politicians had taken up a more confrontational position when Germany was still weak and threatened war when Germany was clearly not ready to fight, Hitler would have had no choice but to concede to international pressure. In this case, taking on an aggressive, confrontational position would have saved millions of lives.
You do not know the war until you have surrendered to the battle.
I am walked over less, knowing that I have a command not to provoke people, than if I voluntarily picked every fight that came my way. Suppose my brother provokes me, if I know that I am commanded not to respond, then when he says "you are a fool" I immediately know I am talking to the Devil and not to my brother, this in turn informs me that I may resist him and he will give up, what is my alternative? To say "I am a fool am I? I'll show you!" No, instead I turn the other cheek and I say "Yes, I can be foolish sometimes" and immediately he is on the back foot, do I mean that I am about to go to war with him, or am I simply admitting guilt, he does not know! He is so concerned with calling me a name that he does not know whether I am assaulting him or merely backing down and so the conflict resolves.
The alternative is that you fight all the time, even the battles you wouldn't otherwise have had to fight.
I am not walked over at all, and I don't go looking for fights, nor do I provoke fights either. Turning the other cheek doesn't deal with provoking fights though, it deals with how you treat someone who is provoking you.
In short, the wise way to live your life is knowing how to pick your battles. Some things are worth fighting for and defending yourself over, whereas other things are not really all that important.
In your above example, first off I'm not sure how you know you're talking to the devil if your brother calls you a fool... I would assume you were talking to your brother, and your brother happens to think you're a fool.
Apart from that, this is a shining example of knowing when to pick your battles. If your brother thinks you're a fool, who really cares. He could very well be wrong. Getting into a fight because someone is calling you a name is pretty childish.
However, on the other hand if someone is threatening you or your family, either from a health or financial or similar standpoint, that's a shining example of where turning the other cheek could lead to disaster for you.