On 11 September 1867, Colonel Thomas J. Kelly ("Deputy Central Organizer of the Irish Republic") was arrested in Manchester, where he had gone from Dublin to attend a council of the English "centres" (organisers), together with a companion, Captain Timothy Deasy.
He did not take any part personally in the attempted insurrection in Ireland or in the raids on Canada, although his advice counted for much in these enterprises.
In 1863, Fennell became one of the first Fenians recruited from County Clare; he then helped recruit and organize a group of men in preparation for the Fenian Rising.
Travelling to Ireland to take part in the Fenian Rising in 1865, he was arrested by British authorities in Cork and ordered to leave the country along with John McCafferty.
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