D-Day marked the start of World War II liberation efforts. For Churchill and his ally President Franklin Delano Roosevelt, it was time to free Europe by organising the largest seaborne military operation in the history of mankind. This documentary takes a closer look at the backstage of the entire set-up of the operation. Some crucial facts on logistics, some incredible secret decisions made by leaders, the involvement of top-ranking officers as well as surprising secret agents all led to the success of the operation.