“Uxbridge: By God, sir, I've lost my leg!
Wellington: By God, sir, so you have!”
Arthur Wellesley, 1st Duke of Wellington (1769–1852) British soldier and statesman
Exchange said to have occurred at the Battle of Waterloo (18 June 1815), after Lord Uxbridge lost his leg to a cannonball; as quoted in Oxford Dictionary of National Biography (2004)
Variant account:
Uxbridge: I have lost my leg, by God!
Wellington: By God, and have you!
Thomas Hardy, in The Dynasts, Pt. III Act VII, scene viii, portraying the incident.