"The source of the real defeat of France and the French Military after WWI... a lack of political will and a government which fully and continuously favored Liberal public opinion so that the Military was not prepared to face the increasingly belligerent and patently overt German mobilization. The German onslaught was a long time coming and a long time ignored by the French government. For that they paid."
In 1938, during the Czech crisis, the french had over 100 active duty divisions mobilized on the border with germany. The Germans has 12 reserve infantry divisions facing them. The entire german army was outnumbered 2 to one and was parked on the Czech border.
All the french needed to do was march. They instead SAT.