Answer:
On 3 September 1939, France had declared war on Germany, following the German invasion of Poland. In early September 1939, France began the limited Saar Offensive. By mid-October, the French had withdrawn to their start lines. ... German forces began Fall Rot (Case Red) on 5 June 1940.
The following analysis concludes that the French lost in 1940 mainly because of three reasons: intelligence failure, operational and tactical inferiority, and poor strategic leadership.
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