The year 1940 saw a number of significant events in radio broadcasting history. Events 5 January: FM radio is demonstrated for the Federal Communications Commission in the United States for the first time. 7 January: The BBC Forces Programme begins broadcasting in the United Kingdom; it becomes the most popular channel among civilians at home as well as its primary target audience. 25 February: The Proud Valley is the first known film to have its première on radio when the BBC broadcasts a 60-minute version. 9 April (7.30 pm): During the German invasion of Norway as part of Operation Weserübung, Vidkun Quisling proclaims a new collaborationist regime on the national radio station NRK. 10 May (9.00 pm): Neville Chamberlain makes the first public announcement of his resignation as Prime Minister of the United Kingdom, and his replacement by Winston Churchill, on the BBC Home Service. 14 May: BBC reporter Charles Gardner working in Reims incorporates the live sounds of a German air raid in a broadcast report. 26 May: Fireside chat by the President of the United States: On National Defense. 2 June: British Secretary of State for War Anthony Eden gives a radio address claiming success of the Dunkirk evacuation. 5 June: Yorkshire-born novelist and playwright J. B. Priestley broadcasts his first Sunday evening radio Postscript, "An excursion to hell", on the BBC Home Service, marking the role of the pleasure steamers in the Dunkirk evacuation, just completed. 18 June General Charles de Gaulle, de facto leader of the Free French Forces in World War II, uses the airwaves of the BBC to make his Appeal of 18 June from London to the French people for resistance to the Nazi German occupation of France. Winston Churchill, Prime Minister of the United Kingdom, repeats his "This was their finest hour" speech, made earlier to the House of Commons, on the BBC Home Service. 14 July: The BBC Home Service 9.00 pm news bulletin includes a vivid account of an air battle over the English Channel recorded live the previous day by reporter Charles Gardner. The bulletin is preceded by a speech by Churchill, "The War of the Unknown Warriorsˮ, and followed by J. B. Priestley's Postscript describing the seaside resort of Margate in wartime. 19 July: Adolf Hitler makes a peace appeal to Britain in an address to the Reichstag, broadcast simultaneously in English translation by Paul Schmidt. BBC German-language