12d. Here The Combat of Munremar and Curoi
While the hosts were there in the evening they perceived that one stone fell on them coming from the east and another from the west to meet it. The stones met one another in the air and kept falling between Fergus' camp, the camp of Ailill and the camp of Nera. This sport and play continued from that hour till the same hour on the next day, and the hosts spent the time sitting down, with their shields over their heads to protect them from the blocks of stones, till the plain was full of the boulders, whence cometh Mag Clochair ('the Stony Plain').
Now it happened it was Curoi macDarè did this. He had come to bring help to his people and had taken his stand in Cotal to fight against Munremar son of Gerrcend. The latter had come from Emain Macha to succour Cuchulain and had taken his stand on Ard ('the Height') of Roch. Curoi knew there was not in the host a man to compete with Munremar. These then it was who carried on this sport between them. The army prayed them to cease. Whereupon Munremar and Curoi made peace, and Curoi withdrew to his house and Munremar to Emain Macha and Munremar came not again till the day of the battle. As for Curoi, he came not till the combat of Ferdiad.
"Pray Cuchulain," said Medb and Ailill, "that he suffer us to change our place." This then was granted to them and the change was made.
The 'Pains' of the Ulstermen left them then. When now they awoke from their 'Pains,' bands of them came continually upon the host to restrain it again.