The Pitt–Tierney duel takes place on Putney Heath outside London. A bloodless duel between the Prime Minister of Great Britain William Pitt the Younger and his political opponent George Tierney.

The Pitt–Tierney Duel took place on 27 May 1798 when the Prime Minister of Great Britain William Pitt the Younger met his political opponent George Tierney in a duel with pistols on Putney Heath outside London. 

Wimbledon Common is a large open space in Wimbledon, southwest London. There are three named areas: Wimbledon Common, Putney Heath, and Putney Lower Common, which together are managed under the name Wimbledon and Putney Commons totalling 460 hectares. Putney Lower Common is set apart from the rest of the Common by a minimum of 1 mile of the built-up western end of Putney.

London is the capital and largest city of both England and the United Kingdom, with a population of 8,945,309 in 2023. Its wider metropolitan area is the largest in Western Europe, with a population of 15.1 million. London stands on the River Thames in southeast England, at the head of a 50-mile (80 km) tidal estuary down to the North Sea, and has been a major settlement for nearly 2,000 years. Its ancient core and financial centre, the City of London, was founded by the Romans as Londinium and has retained its medieval boundaries. The City of Westminster, to the west of the City of London, has been the centuries-long host of the national government and parliament. London grew rapidly in the 19th century, becoming the world's largest city at the time. Since the 19th century the name "London" has referred to the metropolis around the City of London, historically split between the counties of Middlesex, Essex, Surrey, Kent and Hertfordshire, which since 1965 has largely comprised the administrative area of Greater London, governed by 33 local authorities and the Greater London Authority.

A duel is an arranged engagement in combat between two people with matched weapons.