That post may have been a little vague...
John Fleming was born 3 May 1883, Eden, Co Derry. His sister Sarah was married and living in Upper Feeny around the time of the prison record. Family in Scotland did believe that he was in WWI along with his brother Thomas (who also later went missing in Europe.. presumed dead) but they did not know what became of him. Ive found no army record for either brother though. And Ive no idea who Bridget is.. Im just assuming she was his wife, but I had no idea that he married and can see no record on ifhf