A small anecdote not entirely removed from the topic....

For every seven soldiers who escaped through Dunkirk, one man was left behind as a prisoner of war; many of these were soldiers from the British 51st (Highland) Division who fought on in France after the main part of the BEF had been evacuated from Dunkirk on 4th June.

While in the PoW camp near Salzburg Lieutenant J.E.M. 'Jimmy' Atkinson of the 7th Battalion The Argyll and Sutherland Highlanders wrote a modern Scottish country dance the Reel of the 51st Highland Division with a St Andrews cross in its key formation.

His letter home with instructions for the dance was intercepted by the German security service, the Abwehr, who spent the rest of the war trying to break the code!