Tom, the original muster rolls housed at Tulane Univerity indicate 331 of 974 members of the 7th Louisiana were born in Ireland, which was by far the largest foreign born element in the unit (second highest was 42 Germans). When I did my research there for "Lee's Tiger" I didn't break the place of birth down by companies, so don't know how many of these Irish would have been in Herron's company.