The First English Civil War took place in England and Wales from 1642 to 1646, and forms part of the 1639 to 1653 Wars of the Three Kingdoms. They include the Bishops' Wars, the Irish Confederate Wars, the Second English Civil War, the Anglo-Scottish war (1650–1652) and the 1649 to 1653 Cromwellian conquest of Ireland. Historians estimate that between 15% to 20% of all adult males in England and Wales served in the military between 1639 to 1653, while around 4% of the total population died from war-related causes. This compares to a figure of 2.23% for World War I, which illustrates the impact of the conflict on society in general and the bitterness it engendered.