Read more about this famous quote by Winston Churchill spoken during a speech at the House of Commons by clicking on the link to Wikipedia.
Churchill apparently first used his famous words upon his exit from the Battle of Britain Bunker at RAF Uxbridge on 16 August when visiting the No. 11 Group RAF Operations Room during a day of battle. Afterwards, Churchill told Major General Hastings Ismay, ‘Don’t speak to me, I have never been so moved’. After several minutes of silence he said, ‘Never in the history of mankind has so much been owed by so many to so few’. The sentence would form the basis of his speech to the House of Commons on 20 August.
However, in 1954 “Pug” Ismay related an anecdote to publisher Rupert Hart-Davis; when Churchill and Ismay were
travelling together in a car, in which Winston rehearsed the speech he was to give in the House of Commons on 20 August 1940 after the Battle of Britain. When he came to the famous sentence, ‘Never in the history of mankind have so many owed so much to so few’, Ismay said ‘What about Jesus and his disciples?’ ‘Good old Pug,’ said Winston’ who immediately changed the wording to ‘Never in the field of human conflict….’.
The speech was given as the United Kingdom prepared for the expected German invasion. In it, Churchill tried to inspire his countrymen by pointing out that although the last several months had been a series of monumental defeats for the Allies, their situation was now much better than before. Churchill’s argument was in fact correct; shortly thereafter the British won the battle, the first significant defeat for the hitherto unstoppable Wehrmacht.