Hi Artie
The heading of the post was following that of the original thread, but I did pick up your post by searching for Durham Fencibles. I am aware of the Durham Militia being a separate body, as another ancestor of mine served in it.
I have no evidence that John Smurthwaite, born in Durham in 1778, served in the military. I do know that he was in Ireland in 1799, but cannot imagine why he would have gone there as a civilian at a time of rebellion. In the 1851 census his eldest daughter is recorded as having been born in Ireland. She was baptised in Durham in 1803 but her date of birth was recorded as 1799. His second daughter was born and baptised in Durham in 1802. John Smurthwaite's wife had been born in Irvine, Ayrshire, Scotland, recorded in the detailed Barrington-style baptism records of his children. I assume they met in Ireland, but what she was doing there is also a mystery. I therefore have no idea where in Ireland they married or where their daughter was born. After discovering that the Durham Fencibles had served in Ireland during the appropriate period, and been disbanded in 1802, I felt that it was a possibility worth following up.
I am planning to search for John Smurthwaite in muster rolls of regiments that served in Ireland during this period at TNA, but if you do come across him, I would be pleased to hear from you.
Kind regards
John