In April 1916, during the First World War, Irish republicans launched an uprising against British rule in Ireland, called the Easter Rising. They proclaimed an Irish Republic. After a week of heavy fighting, mostly in Dublin, the rising was put down by British forces. About 3,500 people were taken prisoner by the British, many of whom had played no part in the Rising. Most of the Rising's leaders were executed. The rising, the British response, and the British attempt to introduce conscription in Ireland, led to greater public support for Sinn Féin and Irish independence. The party was also helped by the 1918 Representation of the People Act which increased the Irish electorate from around 700,000 to about two million.