In 1916 the Easter Rising succeeded in turning public opinion against the British establishment after the execution of the leaders by British authorities. It also eclipsed the home rule movement. In 1922, after the Irish War of Independence most of Ireland seceded from the United Kingdom to become the independent Irish Free State but under the Anglo-Irish Treaty the six northeastern counties, known as Northern Ireland, remained within the United Kingdom, creating the partition of Ireland. The treaty was opposed by many; their opposition led to the outbreak of the Irish Civil War, in which Irish Free State, or "pro-treaty", forces proved victorious. The history of Northern Ireland has since been dominated by the division of society along sectarian faultlines and conflict between (mainly Catholic) Irish nationalists and (mainly Protestant) British unionists. These divisions erupted into the Troubles in the late 1960s, after civil rights marchers were met with opposition by authorities. The violence escalated after the deployment of the British Army to maintain authority led to clashes with nationalist communities. The violence continued for 28 years until an uneasy, but largely successful peace was finally achieved with the Good Friday Agreement in 1998.