The battle of Cúil Dreimne i.e. in vengeance won over Diarmait son of Cerball. Forgus and Domnall two sons of Mac Erca and Ainmire son of Setna and Nainnid son of Daui, and Aed son of Eochu Tirmcharna, king of Connacht, were victors through the prayers of Colum Cille, saying:
1. O God!
Why dost thou not ward off the mist,
That we might reckon the number
Of the host which has taken judgment from us.
2. A host that marches around a Cairn,
And a son of storm that betray us;
My druid—he will not refuse me—is
The Son of God; with us He will act.
3. How grandly he bears his course—
Baedan’s steed—before the host;
Good for Baedan of the yellow hair
He will win his renown on him.
Fraechán son of Tenusan made the druidic ‘fence’ for Diarmait son of Cerball, Tuatán son of Dimán son of Sarán son of Cormac son of Eógan cast the druidic ‘fence’ over them. Maglaine leaped over it and he alone was killed.
— Chronicon Scotorum, Annal CS561.