Riot Act felt uncertain of their power to take action to stop the riots without a reading of the Riot Act. After the riots, Lord Mansfield observed that the Riot Act did not take away the pre-existing power of the authorities to use force to stop a violent riot; it only created the additional offence of failing to disperse after a reading of the Riot Act. The Riot Act was read prior to the Peterloo Massacre of 1819, as well as prior to the Bristol Riots at Queen's Square in 1831. Both are held to be related to the Unreformed House of
Peterloo Massacre Manchester magistrates met at 9:00 am, to breakfast at the Star Inn on Deansgate and to consider what action they should take on Henry Hunt's arrival at the meeting. By 10:30 am they had come to no conclusions, and moved to a house on the southeastern corner of St Peter's Field, from where they planned to observe the meeting. They were concerned that it would end in a riot, or even a rebellion, and had arranged for a substantial number of regular troops and militia yeomanry to be deployed. The military presence comprised 600 men of the ; several hundred