Operation Overlord: The D-Day Story (April–June 1944)

The success of the D-Day landings owed much to the element of surprise. Remarkably, the massive invasion force gathered along the south coast of England remained unnoticed by German Intelligence. Hitler's generals dismissed the possibility of an attack, believing the stormy weather made such an operation impossible—and they were nearly right.
Produced and narrated by Liam Dale.