It is all about breaking down spirit, getting a psychological upper hand and reducing effectiveness by lowering morale.

Fortunately for the Chinese they already had a tried and true program, tested on their own people.

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Corporal Frederick William (Bill) Williams went on a reconnaissance, which he ruefully called "A Night Stroll".

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Even a humble bugle in the right hands can be a chilling weapon of war.

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Prisoners of war were particularly vulnerable to brainwashing. With the spirit broken, there was always the chance of a confession that didn't even have to be true.

Those who didn't crack faced long stretches 'In the Box' or more accurately, 'Down the Hole'.

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