Thousands of Allied troops have begun landing on the beaches of Normandy in northern France at the start of a major offensive against the Germans. Thousands of paratroops and glider-borne troops have also been dropped behind enemy lines and the Allies are already said to have penetrated several miles inland. The landings were preceded by air attacks along the French coast. BBC ON THIS DAY | 6 | 1944: D-Day marks start of Europe invasion
