The battle of Cúl Dreimhne was gained against Diarmaid, son of Cearbhall, by Fearghus and Domhnall, the two sons of Muircheartach, son of Earca; by Ainmire, son of Sedna; and by Ainnidh, son of Duach; and by Aedh, son of Eochaidh Tirmcharna, King of Connaught. It was in revenge of the killing of Curnan, son of Aedh, son of Eochaidh Tirmcharna, while under the protection of Colum Cille, the Clanna Neill of the North and the Connaughtmen gave this battle of Cul Dreimhne to King Diarmaid; and also on account of the false sentence which Diarmaid passed against Colum Cille about a book of Finnen, which Colum had transcribed without the knowledge of Finnen, when they left it to award of Diarmaid, who pronounced the celebrated decision, ‘To every cow belongs its calf,’ &c. Colum Cille said:
1. O God, wilt thou not drive off the fog,
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which envelopes our number,
The host which has deprived us of our livelihood,
2. The host which proceeds around the carns!
He is a son of storm who betrays us.
My Druid,—he will not refuse me,—
is the Son of God, and may he side with me;
3. How grandly he bears his course,
the steed of Baedan before the host;
Power by Baedan of the yellow hair
will be borne from Ireland on him the steed.
Fraechan, son of Teniusan, was he who made the Erbhe Druadh for Diarmaid. Tuathan, son of Dimman, son of Saran, son of Cormac, son of Eoghan, was he who placed the Erbhe Druadh over his head. Three thousand was the number that fell of Diarmaid’s people. One man only fell on the other side, Mag Laim was his name, for it was he that passed beyond the Erbhe Druadh.
— Annals of the Four Masters, M555.2.