With reference to Steve's post of the 16th inst., An old friend, now long dead, hearing the Dubliners (or some other ballad group) singing "Mrs McGrath" told me that when he was interned in Ballykinlar Concentration Camp in Co.Down in 1920, some of his fellow internees (from the Irish Volunteers ) composed a "new" version of the old song.
It went ...

"Oh Mrs McTack," the Sargeant said,
"Would you like to make a Black 'n Tan o' your son Ted,
With a fine tan coat an' a Glenagarry hat,
Now Mrs. McTack wouldn't you like that !"

With me toor aye ah, Fol de diddle dah,
Toor aye, Oor aye, oor aye ah.