Mick,
here's a few off the top of my head, you'll probably know them.

The Bold Fenian Men ("see who comes over the red blossomed heather...")

The Bold Fenian Men ("'Twas down by the Glenside")

James Stephens, the Gallant Fenian Boy

The Manchester Martyrs (aka Smashing of the Van)

The Fenians Escape.

The latter three are printed in O'Lochlainn's ballad books.