As the French army, why was it possible to defend the homeland in World War I, but encountered the crisis of national subjugation in World War II?

As the French army, why was it possible to defend the homeland in World War I, but encountered the crisis of national subjugation in World War II?
In France during World War I, the national mood was extremely high.

in the first 50 years of the 20th century, mankind experienced two large-scale world wars. Europe was the core battlefield of the two world wars, and France, as a major European country, naturally participated in it.

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