1918 Sinn Féin won 73 of the 105 Irish seats in the British House of Commons. The elected members did not take their seats but instead set up the First Dáil, in line with the still continued practice today of abstentionism. Between 1919 and 1921 the Irish Republican Army (IRA), who were loyal to the Dáil, fought the British Army and Royal Irish Constabulary (RIC), a predominantly Roman Catholic force, in the Irish War of Independence. Talks between the British and Irish in late 1921 led to a treaty by which the British conceded, not a 32-county Irish Republic, but a 26-county Irish Free State with Dominion status. This led to the Irish Civil War, in which the republicans were defeated by their former comrades. The Free State became an independent constitutional monarchy following the Balfour Declaration of 1926 and the Statute of Westminster 1931; changed its name to /Ireland and arguably became a Republic with the passage of the Constitution of Ireland in 1937. In 1939–40, the IRA carried out a sabotage/bombing campaign in England (the S-Plan) to try to force British withdrawal from Northern Ireland. The final figures resulting from the S-Plan are cited as 300 explosions, ten deaths and 96 injuries. Ireland formally described itself as a republic with the passage of the Republic of Ireland Act 1948. That same year (1948), the republican movement took the decision to focus on Northern Ireland thereafter. The Border Campaign, which lasted from 1956 to 1962, involved bombings and attacks on Royal Ulster Constabulary barracks and border infrastructure. The failure of this campaign led the republican leadership to concentrate on political action and to move to the left. The Border Campaign cost the lives of eight IRA men, four republican supporters and six RUC members. In addition, 32 RUC members were wounded. Following the outbreak of The Troubles in 1968–9, the movement split between Officials (leftists) and Provisionals (traditionalists) at the beginning of 1970. Both sides were initially involved in an armed campaign against the British state, but the Officials gradually moved into mainstream politics after the Official IRA ceasefire of 1972; the associated "Official Sinn Féin" eventually renamed itself the Workers' Party. The Provisional IRA, except during brief ceasefires in 1972 and 1975, kept up a campaign of violence for nearly thirty years, directed against security forces and civilian targets (especially businesses). While the Social Democratic and Labour Party