Dunkirk: 6 big questions on a remarkable rescue mission

As Christopher Nolan's new film is released about the rescue of 338,000 Allied troops from the clutches of the Germans, Tim Benbow considers six of the biggest questions on 'the miracle of Dunkirk'

Crew members of the French destroyer Bourrasque, sunk by mine at Dunkirk, are hauled aboard a British vessel from their sinking life-raft. (Photo by Hulton Archive/Getty Images)

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