Despite Churchill’s meticulous preparation for his speeches, he soon realized – following “a complete disaster” – that learning them by heart was not enough. In the spring of 1904, as he moved further and further away from his old Tory colleagues, his House of Commons experiences were tense and difficult. He became an increasingly isolated figure. On 22 April, making a speech in favour of improving trades union rights, he had been speaking for 45 minutes, without notes as usual, when he forgot his words. He struggled vainly for what he later called “the most embarrassing 3 minutes of my life”, trying to remember the rest of his speech, and then sat down in silence, distraught. Some believed him to be displaying early signs of the same mental decline from which his father Lord Randolph had suffered, and saw this as an appallingly public display of weakening mental faculties. His breakdown was met with jeers from some Tory members, but also with sympathy by others.

The first, flatter version chimes with criticism of the broadcast noted by Mass-Observation. Some said Churchill sounded ‘tired’, others ‘suggested that he was drunk’ (p. 58). According to the BBC, however, the second, livelier version is the one that was broadcast on the evening of 18 June 1940. Worse, still, the BBC archive posts another version of the speech which, in fact, combines portions of this broadcast with Churchill’s ‘The news from France is very bad’ address made the night before. It can be heard here:
When Hitler launched his sudden attack on the Soviet Union, Churchill’s response was swift and unequivocal. In a broadcast on June 22, 1941, while refusing to “unsay” any of his earlier criticisms of Communism, he insisted that “the Russian danger…is our danger” and pledged aid to the Russian people. Henceforth, it was his policy to construct a “grand alliance” incorporating the Soviet Union and the United States. But it took until May 1942 to negotiate a 20-year Anglo-Soviet pact of mutual assistance.
We shall go on to the end, 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.”
The Roar of the Lion tells the intriguing and complex story of how Churchill’s speeches were really received by the public at home and around the world.  Using government and unofficial survey evidence and the diaries or ordinary people, Professor Richard Toye shows how reactions to Churchill’s speeches at the time both stimulated and excited but also caused disappointment and considerable criticism. The complexity of this reaction has been consistently obscured from the historical record by the overwhelming power of a treasured national myth.

Nevertheless, our thankfulness at the escape of our Army and so many men, whose loved ones have passed through an agonizing week, must not blind us to the fact that what has happened in France and Belgium is a colossal military disaster. The French Army has been weakened, the Belgian Army has been lost, a large part of those fortified lines upon which so much faith had been reposed is gone, many valuable mining districts and factories have passed into the enemy’s possession, the whole of the Channel ports are in his hands, with all the tragic consequences that follow from that, and we must expect another blow to be struck almost immediately at us or at France. We are told that Herr Hitler has a plan for invading the British Isles. This has often been thought of before. When Napoleon lay at Boulogne for a year with his flat-bottomed boats and his Grand Army, he was told by someone. “There are bitter weeds in England.” There are certainly a great many more of them since the British Expeditionary Force returned.

Winston Churchill Speech WW2