Jon
I agree "Follow Me..." uses a very different language to McCall's other well-known songs, alright - but he did write it!
Patrick Galvin's book "Irish SOngs of Resistance" says of "Follow..":
It is said that this air was first performed by the pipers of Feach McHugh as he m arched to attack Carlow after his victory over Lord Deputy Grey at Glenmalure (1580)
I would take that with large amounts of salt.
Regards