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Every service record I can find for this man describes as being from Durrow, County
Tipperary, which does exist according to the National Archives of Ireland:
http://titheapplotmentbooks.nationalarchives.ie/pagestab/Tipperary/Durrow/Is there a reason you believe this to be wrong?
Looks like it might also be known as Dorrha?
https://en.wikipedia.org/wiki/DorrhaMy knowledge of Ireland is Kerry-based, so perhaps would be better to wait for someone better acquainted with Tipperary. Also, I am assuming James was a member of the Catholic Church, but he could, of course, have been a member of the Church of Ireland, in which case it is rather difficult to research.
In terms of the best resources for researching in Ireland:
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https://www.irishgenealogy.ie/en/ is a free website that holds civil registration (post-1864) records and also transcriptions of church records for certain Irish counties.
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https://registers.nli.ie is a free website that holds images of the Catholic parish registers.
Highly unlikely, though, that you will find a baptism for this man, as registers don't usually stretch that far back, so looking at his life after the army is probably more realistic.
The NLI does hold the records for Castletownbere, starting from 1819, so maybe you will something there?:
https://registers.nli.ie/parishes/0030Queenie