In nearly a half-century of missionary work throughout England, Wales, Scotland and Ireland, brothers John and Charles Wesley found the southwestern county of Cornwall to be among their most serious theological and social challenges. Eighteenth-century Cornwall lacked population centers, and small towns and villages were isolated by inadequate roads. The adult population consisted mainly of miners, fisherman and smugglers - men more interested in the bulk of their pocketbooks than in the status of their souls. And the clergy of the Church of England overwhelmingly opposed the Wesleys and their itinerant preachers, encouraging Anglicans to disrupt the Wesleys' outdoor services and to attack and burn Methodist preaching houses. Although the Wesleys made some evangelical progress in Cornwall, the question remained upon John Wesley's death in 1791: did the mission to Cornwall succeed or fail? This book considers the mission with a close reading of the Wesleys writings, and covers the overall history of 18th-century British Methodism and its contribution to the religious and social history of the British Empire.