In the 1960s, moderate unionist prime minister Terence O'Neill (later Lord O'Neill of the Maine) tried to introduce reforms, but encountered strong opposition from both fundamentalist Protestant leaders like Ian Paisley and within his own party. The increasing pressures from Irish nationalists for reform and opposition by Ulster loyalists to compromise led to the appearance of the Northern Ireland Civil Rights Association, under figures such as Austin Currie and John Hume. It had some moderate Protestant support and membership, and a considerable dose of student radicalism after Northern Ireland was swept up in the worldwide protests of 1968. Clashes between marchers and the RUC led to increased communal strife, culminating in an attack by a unionist mob (which included police reservists) on a march, known as the Burntollet bridge incident, outside Derry on 4 January 1969. Wholescale violence erupted after an Apprentice Boys march was forced through the Irish nationalist Bogside area of Derry on 12 August 1969 by the RUC, which led to large-scale disorder known as the Battle of the Bogside. Rioting continued until 14 August, and in that time 1,091 canisters, each containing 12.5g of CS gas and 14 canisters containing 50g, were released by the RUC. Even more severe rioting broke out in Belfast and elsewhere in response to events in Derry (see Northern Ireland riots of August 1969). The following thirty years of civil strife came to be known as "the Troubles".