Battle of France – Wikipedia

The Battle of France, also known as the Western Campaign (Westfeldzug) the French Campaign, and as the Fall of France, was the German invasion of France, Belgium, Luxembourg and the Netherlands during the Second World War.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 and by mid …

https://en.wikipedia.org/wiki/Battle_of_France