The Peterloo Massacre (or Battle of Peterloo) occurred at St Peter\'s Field, Manchester, England, on 16 August 1819, when cavalry charged into a crowd of 60,000–80,000 that had gathered to demand the reform of parliamentary representation. In the ensuing confusion, 15 people were killed and 400–700 were injured. The massacre was given the name Peterloo in ironic comparison to the Battle of Waterloo, which had taken place four years earlier.