Note that the first part of the 'Fiddler's Companion' quote is paraphrased from Linscott, Folk Songs of Old New England (1939):

"The tune 'Come, Haste to the Wedding,' of Gaelic origin, was introduced in the pantomime, The Elopement, staged in London in 1767. This version is known as the Manx tune and was printed by the Percy Society in 1846. It is the basis of the Manx ballad, 'The Capture of Carrickfergusby,' written by Thurot in 1760."

For corrections to that statement, inserted in a later edition of Linscott, and further important commentary from Bruce Olson and John Moulden, see thread  LYR REQ: Carrick Fergus  (1998-2000).