After twenty-one years of avid research on the O'Sullivan clan, I still occasionally find something new. This is from The Battle of the Raven's Glen, a ballad that describes O'Sullivan Beare ambushing a force of "Saxons and kerns from the wilds of Duhallow" in the Ballyhoura Mountains between Cork and Limerick.
"Then O'Sullivan burst like the angel of slaughter
On the foe by the current of Geeragh's wild water
And his brave men of Cork and of Kerry's wild regions
Were the rushing destroyers, his death-dealing legions
And onward they rode over traitor and craven
Whose bones long bestrewed the lone Glen of the Raven."