Doheny became connected with the national movement in the forties, and wrote prose and verse to The Nation over his initials, and signature of "Eiranach." He may also have been "A Tipperary Man," who wrote poems in the same paper between 1842 and 1848. He contributed letters to the Irish Tribune in 1848. Thomas Mooney states in his History of Ireland that Doheny was a parliamentary reporter in London in his early days.
He was also instrumental in the founding of the Irish-American69th Infantry Regiment, nicknamed the "Fighting Irish", in which he was a company commander. Though it was never involved in liberating Ireland, as Doheny hoped, the regiment would have an illustrious history in the American Civil War and both world wars.
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