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April 6: The United States declares war on Germany. April 16-May 9: A French offensive at Chemin des Dames in the Champagne region fails, killing several tens of thousands in a few days. Some French soldiers mutiny.
April 6: The United States declares war on Germany. April 16-May 9: A French offensive at Chemin des Dames in the Champagne region fails, killing several tens of thousands in a few days. Some French soldiers mutiny.