On September 1 1939 Hitler attacked Poland and two days later Britain and France declared war. For the next five months little military action was taken and this period was named 'the Phony War'. However, in April 1940 Hitler broke the silence with his invasion of Denmark and Norway.
Norway was important to Hitler because of the iron ore she produced, which was crucial to the German armaments industry. Since the British were interfering with this trade Hitler decided to invade and secure the Norwegian ports. As a result of this invasion Chamberlain was forced to resign and Winston Churchill became Prime Minister of Britain.
On the May 10 Hitler attacked Holland, Belgium and France. Both Holland and Belgium surrendered not long after and the 338 000 Ally troops were forced to evacuate from Dunkirk. Luckily for them the German navy had lost several cruisers and destroyers in the invasion of Norway which made them less effective and therefore the troop were successfully evacuated. Unfortunately, the British arms and equipment had to be left behind which in turn made it impossible for them to help France.
Now that Hitler had gained access to France through Belgium he was able to attack France while avoiding the Maginot defence Line. Under Mussolini, Italy also joined Germany's attack on France and declared war. Despite the French having just as many troops as the Germans, the reason for their defeat was that they had poor communication between their army and air force, and, instead of keeping the tanks together like the Germans, they split them up between the infantry divisions. There was also a general division in France between those wanting to sue for peace with Hitler and those