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But the international cooperation being celebrated this week wasn't as straightforward as it is generally believed to be.

For a long time the British and the Americans argued about whether D-Day was even worth trying. But even when they agreed, a victory was never certain.

Winston Churchill wanted to focus on the Mediterranean campaign and wrote to President Roosevelt in 1943 casting doubt over whether D-Day should happen 1944. But he was persuaded by the Americans to go ahead.

Our Diplomatic Editor Mark Urban reports.