That the Germans would attack surprised no one. Both Britain and France had declared war on Germany on September 3, 1939, two days after the German attack on Poland, and so had eight months to get ready. Likewise, it cannot be said that the German tactics were a surprise. They were a refinement of tactics the Germans had used in their last major offensive in the earlier war and had been studied by both French and British strategists between the wars. As for terrain, the French could read a map and knew about conditions in the Ardennes Forest and the network of narrow roads that traversed it.
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