But the escalating situation in Europe was getting hard to ignore. Churchill rose to the Prime Ministry on May 10, 1940, coinciding with the end of the so-called “Phoney War,” a period stretching from September 1939, with the declaration of war against Germany, to the spring of 1940, a period with no major military land operations on the European continent. That stagnation ceased after the Nazis invaded Denmark and Norway in April. The Battle of Dunkirk -- which would incur heavy Allied casualties, prompt a Belgian surrender, and precipitate the fall of France -- commenced in May.
The speech takes on an inexorable rhythm, which coupled with the use of repetition, acquires a kind of imperial power reminiscent of Shakespeare. The extraordinary potency of these words transformed the nation. It filled everyone who heard it with faith and conviction, and it enabled our small island to withstand pure evil. It somehow reaches into the very soul of England and calls up that lion spirit which lies dormant within every English heart.
In the most famous passage of his speech, Churchill warned Britain about the possible collapse of France and that, consequently, she would stand alone against Germany and face an invasion. He left the House in no doubt what the resolution would be should that occur: 'We shall fight in France, we shall fight on the seas and oceans, we shall fight with growing confidence and growing strength in the air, we shall defend our island whatever the cost may be. We shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills. We shall never surrender!'.
Expecting that the German offensive would develop along much the same lines as it did in 1914, the lines of communication of the British Expeditionary Force (BEF) did not run through the "short crossing" Channel ports – Boulogne, Calais, Dunkirk, etc. – but rather through Dieppe and Le Havre. On 13 May, the Wehrmacht's attack through the Ardennes had reached the Meuse River at Sedan and then crossed it, breaking through the defences of the French Army. By 20 May, Wehrmacht armoured divisions had reached the coast of the English Channel, splitting the BEF and the French First Army from the main French forces.