This volume represents the first dedicated study of the British Yeomanry Cavalry, delving into the institution's history from the cessation of hostilities with France in 1815 through to the eve of the First World War in 1914. This social history explores the Yeomanry's composition and place within British society, as well as its controversial role in policing before and after Peterloo, and its unique contribution to the war in South Africa. Overturning or challenging many enduring myths and accepted truths, this book breaks new ground not just in our understanding of the Yeomanry, but the wider amateur military tradition.