Here it is. It was recorded by the Men of No Property in 60's or 70's. The tune is a version of the Battle of Harlaw. You'll find that in the digitrad search – I can't do the little blue thingy. And the words will probably really irritate some people.

CROSSMAGLEN

As I came in by Newry town, who do you think I saw?,
I met the first battalion of the men from south Armagh,

chorus. With a biddy-i-o and the pal and the do and the biddy-i-o-i-aye.

Have you crossed the border and have you travelled far?
Did you meet the army on the road were they in armoured car?

Yes, I have crossed the border and I have travelled far
I met the army on the road they were in two armoured car.

If this be true, their leader said, here we'll make a stand
McVerry gave the order with a big T in his hand

The army came along the road and into view at last
A young man pulled the plunger out and there was a mighty blast

We opened up along the ditch with everything we had,
Before the ambush finished well we knew we'd hit them bad

Politicians raise their hands, "An act of terror" say
They let us rot for fifty years, it was their only way.