“I have seen their backs before, madam.”
This is attributed to Wellington as a statement to an unidentified woman at a reception in Vienna, who had apologized for the rudeness of some French officers who had turned their backs on him when he entered, as quoted in Bartlett's Book of Anecdotes (2000), edited by Clifton Fadiman and André Bernard, p. 568
This is attributed to Wellington as a statement to King Louis XVIII at a ball in the spring of 1814, as quoted in "Anecdotes of Wellington" at The Wellington Society of Madrid http://www.wellsoc.org/Anecdotes.htm
Variant: 'Tis of no matter, your Highness, I have seen their backs before.
Source: https://books.google.cl/books?id=aarPgpKPA0oC&q=vienna+I%27ve+seen+their+backs+before,+madam&dq=vienna+I%27ve+seen+their+backs+before,+madam&hl=es-419&sa=X&ved=2ahUKEwiyz4SKk93sAhVyBtQKHZx7AjsQ6AEwAHoECAAQAg page 27
