Is it true that French military leadership believed that their second conflict with Germany (ww2) would be just another version of the Great War? And if so, why not fortify their border with Belgium?
I always hear claims about how France was prepared to have another trench war and was taken by surprise by German lightning warfare tactics, but does this actually reflect French thinking at the time? And if so, why not extend the main fortifications of the Maginot line with its border with Belgium when it was entirely sure it would enter another war with Germany? (As I understand, the French actually offered to subsidize fortifying the Ardennes region during the 1930's but this was declined by Belgium).
I mean even just seeing from the German perspective leading up to both wars, it makes total sense that if for whatever reason they decided to adopt another trench war campaign with France, that they would go through Belgium. The Schlieffen Plan was a totally sound idea for Imperial German High Command, and if you ignored the way WW1 went, it would make sense if implemented again. The Franco-German border was heavily fortified (significantly more than in WW1). Northern France through Belgium was flatter, operationally open and would allow for further operations (hell its apart of why there was little to no allied troops in the Netherlands, they prioritized Belgium). And I imagine France expected any major German offensive to come through Belgium anyway (and ironically it did with Fall gelb).