Hi Tom; I have a books of old Irish ballads and the only one that comes close to what you asking for is "General Munroe." It is common for the name to be changed to suit the singer and perhaps that is the case here.
First verse:

My name is George Campbell. At the age of eighteen,
I joined the United Men to strive for the green,
And many a battle I did undergo,
With that hero commander, brave General Munroe.

Have you heard of the battle of Ballinahinch,
Where the people oppressed rose up in defence?
When Munroe left the mountains, his men took the field,
And they fought for twelve hours and never did yield.

There are the first two verses. He will be able to tell from them I'm sure. The music is in the book also but not with chords. I would have to have it copied if he wants it. Let me know.
My e-mail is retafain@mindspring.com

Regards and luck. Reta