quality:correction
Duel with Winchilsea

The Earl of Winchilsea accused the Duke of "an insidious design for the infringement of our liberties and the introduction of Popery into every department of the State". Wellington responded by immediately challenging Winchilsea to a duel. On 21 March 1829, Wellington and Winchilsea met on Battersea fields. When the time came to fire, the Duke took aim and Winchilsea kept his arm down. The Duke fired wide to the right. Accounts differ as to whether he missed on purpose, an act known in duelling as a delope. Wellington claimed he did. However, he was noted for his poor aim and reports more sympathetic to Winchilsea claimed he had aimed to kill. Winchilsea discharged his pistol into the air, a plan he and his second had almost certainly decided upon before the duel. Honour was saved and Winchilsea wrote Wellington an apology.

The nickname "Iron Duke" originated from this period, when he experienced a high degree of personal and political unpopularity. Its repeated use in Freeman's Journal throughout June 1830 appears to bear reference to his resolute political will, with taints of disapproval from its Irish editors. During this time, Wellington was greeted by a hostile reaction from the crowds at the opening of the Liverpool and Manchester Railway.