Britain declares war on Germany
Following the invasion of Poland by Germany on 1 September 1939, the United Kingdom and France declared war on Germany.
Below: The Prime Minister, Neville Chamberlain, raising his hat to the crowd as he left 10 Downing Street on the day that Britain declared war on Germany, 3 September 1939.
THE OUTBREAK OF THE SECOND WORLD WAR, SEPTEMBER 1939© IWM (HU 5538)