A henry son of Hugh Dummigen/Dommogen and Esther Cowley was baptised at St Peter's in Peel 1817-02-28 - they were married Peel 1816-05-18 (St peter's was parish church for German) - It is possible that Hugh may have been with the 11th battalion Royal Veterans which was based in Peel before being disbanded July 1815 but there was considerable interaction between Peel and Irish fisherman.
Getting the mormon film of the parish reg may give more info re marriage (unfortuneately my own transciption stops a little before this date)