And it was never breached directly, instead it was the failure of France (a certain General Huntziger stabds out), the UK, Belgium and the Netherlands to halt the German invasion through the low countries. For all intended purposes, the Marginot line worked as intended and didn't fail. A lot of other stuff did. By now you can basically use the Maginot line as a litmus test whether or not people properly analyzed a topic or if they work based on memes.
Edit: The push through the Ardennes was a gamble even the German army, and its Generals, were surprised to actually work.
Edit: The push through the Ardennes was a gamble even the German army, and its Generals, were surprised to actually work.