What does M.Hamel say about the importance of language to an enslaved people?

Please answer this as a long answer question from the chapter "The Last Lesson "

M Hamel during the last french lesson explained the villagers and students the importance of preserving ones language . He explains that when a people(shows unity) are enslaved then their language acts as a key to the prison of slavery. one must always preserve their language and holdfast to it..............
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