After the invasion scare of 1745, and the later strain on the regular army during the Seven Years' War, bills for the reform of the militia were brought to parliament, but it was not until 1759 that the act would be passed (30 Geo II c.25). The act continued with the ballot to select men from each county, in numbers based on a return made by the county authorities of men of eligible age, initially between 18 and 50 years of age. As a substitute could be made on a payment of £10, the burden fell on the working classes. Subsequent explanatory legislation was required to curb rioting in 13 counties over fears of pay and overseas service, the militia would only be used in England and Wales. When not embodied (mobilised) for service the men had an annual training requirement of 28 days by 1762. The Legislation was continually amended, for example, by the end of the Napoleonic wars, to permit wider service in the country, fixed terms of service and paying a bounty for volunteering for the regular army.