German forces break through the Weygand Line
German forces broke through sectors of the Somme-Aisne defensive system between 9 and 12 June, extending the advance across the lower Seine and through Champagne. French strongpoints delayed individual formations and inflicted losses, but mobile German forces increasingly moved through gaps between defended localities and threatened routes behind them. The retreat accelerated as the front lost lateral connection. Army commands shifted south while ports on the Atlantic and Channel coasts became evacuation points for British and Allied personnel still in France.
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