In the first of two programmes, Christopher Cook tells the dramatic story of the diplomatic and military preparations for D-Day 50 years ago. Drawing on the memories of the politicians and Joint Chiefs of Staff, along with the views of leading historians on both sides of the Atlantic, he traces events from America's entry into the war in 1941 until the morning of 5 June 1944 when General Eisenhower took the fateful decision to proceed with the greatest military operation known to history. Producer John Knight