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The French devoted a considerable amount of resources and capital to the construction of the Maginot Line. This defensive line was named after a French Defence Minister. The French constructed a long line of fortifications along their eastern border with German. It stopped at the Belgian border. The French stationed all their forces behind the Maginot Line and adopted a defensive posture.

In September 1939, the French with the British declared war on Germany after Hitler invaded Poland. For several months, there was little or no activity on the Western Front. This period was known as the 'Phoney War.' However, in the Spring of 1940, the Germans shifted their attention west and went on the offensive.