A film series based on Sir Winston Churchill's Memoirs of World War II.

'Operation Overlord': the invasion of Europe is planned, and from the arrival of the first GIs in Great Britain, we see the gradual build-up of forces and their training in invasion tactics, the making and testing of landing craft, and the construction of the 'Mulberry' floating harbour. At the last moment-D-Day minus one-the weather worsens, and the success of the operation is in jeopardy; but Eisenhower decides against postponement and D-Day - June 6 - is set.