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Sole note with citation needed
As a French I wondered in WP:FR village pump about the note, which seemed IMHO questionable.
Here is the translation of another wikipedian's answer to my doubts :
I remind a trial concerning a breton poilu sentenced to death penalty in the context of the French Army Mutinies (1917), on the basis he could not explain why he was found behind the frontline, since he didn't express himself in proper French language. Other soldiers of this conflict who left written traces stated that among the troops breton people were speaking in Lower Brittany dialect. Which leads to the hypothesis that French was taught at that time in elementary schools in Bretagne, to pupils from which the whole family environment spoke the local dialect.
The guy mentioned above was executed for that silly matter ; actually, watching Paths of Glory one may wonder if any reason was worth.
There again, this is in no way a proper citation in Wikipedia, yet it sets the tone in favor of the sentence (which was not my primary opinion) : if this was the situation in 1917, then this is accurate earlier.