This was their finest hour...
The disastrous military events which have happened during the past fortnight have not come to me with any sense of surprise. Indeed, I indicated a fortnight ago as clearly as I could to the House that the worst possibilities were open; and I made it perfectly clear then that whatever happened in France would make no difference to the resolve of Britain and the British Empire to fight on, if necessary for years, if necessary alone.
We are also told that the Italian Navy is to come out and gain sea superiority in these waters. If they seriously intend it, I shall only say that we shall be delighted to offer Signor Mussolini a free and safeguarded passage through the Strait of Gibraltar in order that he may play the part to which he aspires. There is a general curiosity in the British Fleet to find out whether the Italians are up to the level they were at in the last war or whether they have fallen off at all.
What General Weygand called the Battle of France is over. I expect that the Battle of Britain is about to begin. Upon this battle depends the survival of Christian civilization. Upon it depends our own British life, and the long continuity of our institutions and our Empire. The whole fury and might of the enemy must very soon be turned on us.
Hitler knows that he will have to break us in this Island or lose the war. If we can stand up to him, all Europe may be free and the life of the world may move forward into broad, sunlit uplands. But if we fail, then the whole world, including the United States, including all that we have known and cared for, will sink into the abyss of a new Dark Age made more sinister, and perhaps more protracted, by the lights of perverted science.
Let us therefore brace ourselves to our duties, and so bear ourselves that if the British Empire and its Commonwealth last for a thousand years, men will still say, 'This was their finest hour.'
-Winston Churchill, 18 June 1940