Rising flour and bread prices, after the Isle of Man was brought under English Corn Law restrictions on foreign grain imports, sparked a riot at Peel on 1 October 1821 in which crowds broke flour-dealers' windows and forced sales at reduced rates; a similar riot followed in Douglas on 4 October, led by a man from Peel dressed in women's clothing, with ringleaders jailed in Castle Rushen. The House of Keys responded by examining parish grain supplies and imposing an embargo on grain exports; the Duke of Atholl arrived on 31 October, secured a Tynwald petition to restore free trade in foreign grain, and pardoned the rioters, restoring calm by late November.