This book provides the first thorough analysis of the extent of the opposition to World War I in Wales and the most extensive regional study of the antiwar movement in any part of Britain. Aled Eirug focuses on the two main elements of the antiwar movement: the religious opposition on grounds of pacifism and the role of the Fellowship of Reconciliation; and the political opposition concentrated in the Independent Labour Party and the left within the South Wales Miners' Federation. With detailed original research, this book offers unprecedented knowledge provided about the conscientious objectors from Wales during World War I.