"Fare Thee Well Enniskillen" is a traditional Irish song. It was the quick march of the Inniskilling Dragoons. Dr. George Sigerson adapted the music and wrote the words to the ballad.
In the 1960s the song was popularized when a fresh version was written by Tommy Makem who re-wrote some of the lyrics and performed it with the Clancy Brothers. The song describes the regiment's service in Spain during the Napoleonic Wars.
References
Fare Thee Well Enniskillen Wikipedia(Text) CC BY-SA