From: http://vassun.vassar.edu/~sttaylor/Cooley/Lethan.html
There came also Lethan ('the Broad') to his ford on the Nith in the land
of Conalle Murthemni, to fight with Cuchulain. He came upon him at
the ford. Ath Carpait ('Chariot-ford') is the name of the ford where
they fought, for their chariots were broken in the combat on the ford.
It is there that Mulcha, Lethan's charioteer, fell on the shoulder of
the hill between the two fords. Hence it is called Guala Mulchi ('Mulcha's
Shoulder') ever since. It is there, too, that Cuchulain and Lethan met,
and Lethan fell at Cuchulain's hands and he smote his head from his neck
on the ford and left it therewith, that is, he left the head with the
trunk. Wherefore the name of the ford of the Nith was called Ath Lethain
('Lethain's Ford') ever since in the district of Conalle Murthemni.
Then came unto them the Crutti Cainbili ('the Tuneful Harpers'), from
Ess Ruaid in the north to amuse them. They opined it was to spy upon
them they were come from Ulster. When they came within sight of the camp
of the men of Erin, fear, terror, and dread possessed them, and the hosts
pursued them as never men pursued, far and wide, till they escaped them
in the shapes of deer near the standing stones at Lia Mor ('Great Stone')
in the north. For though they were known as the ' Mellifluous Harpers
' they were druids, men of great cunning and great power of augury and
magic.