Agitation for constitutional reform by the Radical movement following the defeat of Napoleon resulted in frequent use of the yeomanry . Most famously , up to 17 people were killed and 650 wounded in the Peterloo Massacre of 1819 , when the Manchester and Salford Yeomanry charged into a 60,000-strong crowd attending a rally in Manchester . On 2 April 1820 , the Stirlingshire Yeomanry was called out during the Radical War – a week of strikes and unrest in Scotland – and three days later its Kilsyth Troop assisted the regular army 's 10th Hussars in the arrest of 18 Radicals at the ' Battle of Bonnymuir ' . In south Wales during the violent collier strikes of 1822 , the Monmouth Troop , assisting the Scots Greys , used the flat of its swords to disperse a mob that was damaging coal trains , and the colliers pelted the Chepstow Troop with stones as it escorted coal wagons a few days afterwards . Elsewhere , the Staffordshire Yeomanry resorted to musketry , mortally wounding one person , when it was deployed to protect working colliers from their striking colleagues . In total , the yeomen of 12 different corps were called out to support the civil authorities on 19 separate occasions in 1822 , and four years later , 13 different corps attended to 16 incidents
Peterloo Massacre
Peterloo Massacre
Yeomanry Cavalry