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They managed to escape weeks after their Argyll and Sutherland Highlanders regiment had surrendered to enemy forces.
They are already famous in their native Highland village of Ballachulish but will now appear in the Second World War film The Darkest Hour.
After initially escaping the trio were captured by the Germans again at a checkpoint and taken to a prisoner of war camp.
But they used their native Gaelic which confused the Germans and the Scots were able to convince their captors they were actually from the Soviet Union,
In his memoir, Private Kemp said: “In the morning we were brought before the German commander, whose first action was to point his revolver at each of us in turn.
“We took this to be a warning to speak the truth or take the consequences. A French officer, acting as an interpreter, asked us to state our nationality.