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28 March 2012, 16:01 | Updated: 28 March 2012, 16:14
We've all heard about the bravery of dogs and horses during wartime - but how about a pigeon?
Today the Duke of York has been at the world-famous code-breaking centre at Bletchley Park to commemorate the bravery shown by the young bird.
In October 1940 the bird was released in Holland - it flew back to Bletchley with vital information on the situation of the landing force.
Royal Blue was bred and trained at Sandringham by King George Vi, Prince Andrew's grandfather. The bird was awarded the Dickin Medal which is the animal equivalent of the George Cross.