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What if the French and British had stepped up their actions against Germany during the German invasion of Poland?

There are three scenarios that I've been wondering about.

1: Britain and France commit troops to Poland itself to help hold off the German invasion, as soon as possible after the invasion begins.

2: A larger Saar offensive, in which the French military succeeds in launching its 40-division assault and isn't quite so half-hearted.

3: A combination of both.

What would happen in any of these situations?
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