Winston Churchill said that Operation Overlord was 'undoubtedly the most complicated and difficult' ever undertaken. With nearly three million troops involved, it was an incredible feat of organisation - and the first step towards the liberation of Western Europe and the defeat of Nazi Germany.
Follow the Allies as they land on the Normandy coast on 6 June 1944, that will forever be known as D-Day, and then track their hard fought campaign to liberate Paris.
