The Ulster Volunteers were a unionist militia founded in 1912 to block domestic self-government (or Home Rule) for Ireland, which was then part of the United Kingdom. The Ulster Volunteers were based in the northern province of Ulster. Many Ulster Protestants feared being governed by a Catholic-dominated parliament in Dublin and losing their local supremacy and strong links with Britain. In 1913, the militias were organised into the Ulster Volunteer Force (UVF) and vowed to resist any attempts by the British Government to 'impose' Home Rule on Ulster. Later that year, Irish nationalists formed a rival militia, the Irish Volunteers, to safeguard Home Rule. In April 1914, the UVF smuggled 25,000 rifles into Ulster. The Home Rule Crisis was halted by the outbreak of World War I in August 1914. Many UVF members enlisted with the British Army's 36th (Ulster) Division and went to fight on the Western Front.