On December 13, 1867, Irish terrorist, Michael Barrett plants a bomb at Clerkenwell Prison in London in an attempt to free fellow Irish political prisoners. The bombing killed 12 bystanders and severely injured many more. Barrett had positioned the bomb in a wheelbarrow outside the external wall of of the jail in the belief that it would bring down the prison wall and allow the prisoners to escape. Michael Barrett was born in 1841 and at the age of 27 he joined the Fenians, which, in the 1860s, was a political movement that dominated Irish politics and defied the Catholic Church and middle-class nationalists who advocated milder approaches. Thousands of Irishmen in both Ireland and Britain were recruited into its ranks.