The irony alone is to make me believe that Dominic Behan borrowed the tune from "Come All You Young Protestants," one of many songs set to the same air. For those who never head the song, hear is the first verse. Note the similarity of the first two lines to "The Patriot Game."

Come all you young Protestants and list while I sing,
The love of old Ulster is a wonderful thing,
We'll fight to defend her, with tooth and with nail,
And we will make certain the truth will prevail.