plugging Tate into my search engine yields
http://www.ee.surrey.ac.uk/Contrib/manx/iomnhas/lm1p141.htm
in which is found
In 1807 Serjeant-Major Godfrey Tate, of the Fencibles, was appointed Adjutant to the "Southern Manx Volunteers.’ In 1808 this corps was doing garrison duty at Castletown.
any help ?