Peterloo Massacre a meeting in Manchester on 2 August 1819. Johnson wrote: Unknown to Johnson and Hunt, the letter was intercepted by government spies and copied before being sent to its destination. The contents were interpreted to mean that an insurrection was being planned, and the government responded by ordering the 15th Hussars to Manchester. The mass public meeting planned for 2 August was delayed until 9 August. The "Manchester Observer" reported it was called "to take into consideration the most speedy and effectual mode of obtaining Radical reform in the Common House of Parliament" and "to consider the propriety of the
Peterloo Massacre many as 150,000; modern estimates are 60,000–80,000. Scholar Joyce Marlow describes the event as "The most numerous meeting that ever took place in Great Britain" and elaborates that the generally accepted figure of 60,000 would have been six per cent of the population of Lancashire, or half the population of the immediate area around Manchester. Although some observers, like the Rev. W. R. Hay, chairman of the Salford Quarter Sessions, claimed that "The active part of the meeting may be said to have come in wholly from the country", others such as John Shuttleworth, a local cotton manufacturer, estimated that