This is the often forgotten chapter of the D-Day story.

To begin our series for the 80th anniversary of the D-Day landings, we turn to the massive naval operations that made it all happen. On D-Day itself, 7,000 ships and 195,000 sailors undertook the gargantuan challenge of ferrying men, weapons and supplies ashore to begin the liberation of Europe. But that was just on the 6th of June - it was preceded by years of bitter warfare at sea, without which Operation Overlord could never have happened.

Dan is joined by naval historian Nick Hewitt, author of 'Normandy: The Sailors' Story', who explains why Allied sailors were the bedrock for Operation Overlord. Whether it be through intelligence gathering, naval bombardment or sinking German U-boats, actions at sea were absolutely vital in paving the way for D-Day.

Produced by James Hickmann and edited by Dougal Patmore.

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