The sources and nature of 'radicalism' in late eighteenth-century Britain have long been debated. At the same time, the impact of war on British politics, society and culture in this period has been underappreciated until recently. While war is recognized as having aided the spread of popular loyalism, its role in stimulating radicalism has been neglected. Based on study of the publications and letters of Richard Price (1723-91), this article highlights the influence of Anglo-French rivalry and war on the thought of a leading Rational Dissenter and champion of political reform.It was possible for J. G. A. Pocock to call Richard Price (1723-91) 'the first and original Left-Wing Intellectual' in British history because he provoked Edmund Burke to write his seminal conservative Reflections on the Revolution in France, and on the Proceedings in Certain Societies in London Relative to that Event (1790). 1 A leading 'Rational Dissenter' and Enlightenment intellectual in London, Price's Observations on the Nature of Civil Liberty (1776) became one of the most widely read and debated pamphlets during the American Revolution. 2 The late eighteenth century saw the rise of modern popular politics in campaigns for parliamentary reform and abolition of the slave trade. Price embraced both causes. In 1780 he was a founding member of the Society for Constitutional Information, which sought to further the cause of parliamentary reform by disseminating pamphlets. Price was also a tireless advocate for religious liberty. A respected nonconformist clergyman, philosopher and mathematician, Price became one of the most famous and influential of late eighteenth-century British radicals. 3 The sources and nature of late eighteenth-century British radicalism have long been debated. A perceived change in parliamentary politics following the accession of George III in 1760 clearly played a role in causing a dramatic expansion of popular politics in the form of the 'Wilkes and Liberty' movement. 4 With the Jacobite threat receding into the past, and government positions opened to traditionally Tory families, nonconformist Dissenters became more willing to criticize the men and measures of the Hanoverian 1 J. G. A. Pocock, 'Radical criticisms of the whig order in the age between revolutions', in The Origins of