Six hundred years ago today a crew of Englishmen (as they then were) gave a crew of Frenchman (as they then were) a shoeing.
This was a temporary best foot forward in a 116-year war which eventually saw the English get thoroughly leathered (see map below and this excellent website).
Who do you think you are kidding Mister Dolphin?
Faced with this the English started the Wars of the Roses instead: they could hardly lose as long as they were giving each other a kicking.
Saint Crispin is the Patron Saint of cobblers.