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As the title states the POD is a forest fire in 1932 that devastates the Ardennes forest. Now at this time the French were busy building the Maginot line which they believed would be impenetrable. The common misconsception is that the Maginot line was in fact porous and far from impenetrable. However what many people don't realize is that the Maginot line wasn't defeated so much as bypassed through Belgium and the Ardennes forest which the French thought couldn't happen. However what if in the early stages of constructing the line the forest burned down and the French had to consider the reality that they no longer could rely on the Ardennes preventing a German Armored advance? I would imagine that the immediate effects would be that the French would quickly begin planning and construction of an extension of the line to cover this area as well.
So my question to you is, how much does this help the French out? Since now the Germans would have a much harder time making a breakthrough along the French border, it at the very least makes victory in France much more difficult.