Michael Davitt was a member of the Irish Republican Brotherhood (IRB), a revolutionary movement that espoused armed uprising as the only way to rid Ireland of British rule. He mostly participated in arms smuggling operations, and it was on one of these that he was arrested in 1870.
He was sentenced to 15 years hard labour in Dartmoor Prison, where he was subjected to casual brutality and solitary confinement. The letters he sent, describing his treatment, were read aloud in the British House of Commons by sympathetic politicians, and a public outcry against the treatment of Davitt and other Irish prisoners led to his early release. He received a hero’s welcome on his return to Ireland, and returned at once to the struggle, albeit now concentrating on non-violent political actions.
Public Domain, Link
As mentioned in: