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I recently came upon some info that Luxembourg, primarily its capital of Luxembourg City, used to be one of the largest and most important fortifications in Europe. Indeed, it was even called the "Gibraltar of the North" by some. Nevertheless, the fortresses of Luxembourg were dismantled as a part of the 1867 Treaty of London and the duchy was pledged to neutrality.

WI the clause involving Luxembourg was never included in the 1867 treaty? What would have been the consequences for Europe, especially when it comes to WWI and WWII? Assuming that the Luxembourger fortifications are kept modern (which, for the sake of the thread, I am), I can see them being a definite problem at least in WWI, leading to a "bigger" version of Verdun.

At least in my mind, I can see Luxembourg, because of its forts, playing the role of a buffer state between France and Germany. Perhaps the defenses would have been past their heyday when WWII comes around, but I wonder what effect they would have had nonetheless. Could WWI have lead to an alliance between France and Luxembourg, leaving Luxembourg City an integral part of the Maginot Line? I'm sure the Germans would have done their best to bypass the defenses. However, if they are large enough I think they would have been forced to assault them, i.e. Brest in Operation Barbarossa.
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