Mr Wallis is correct. Jack Lynch did not speak in Derry. I phrased that badly. I should have said speeches about Free Derry and the Bogside. Hell, I'm not sure if Jack Lynch knew the road to Derry.
In any case, the republicans in the north felt sold out by the Government in Dublin as can be seen in the second verse of the song.

Jack, where were you last August, with your band of merry men?
Were you in the Bogside, were you on the Falls Road then?
Ah no, you were down in Dublin, tellin' all you knew
On every Irish soldiet who could hold a gun, it's true.


                  Mike