The four great provinces of Ireland came the next day eastwards over Cruinn, that is, the mountain called Cruinn. Cú Chulainn went ahead of them. He met the charioteer of Órlám, the son of Ailill and Medb who was at Tamlachta Órláim to the north of
Then came the three Meic Árach on to the ford at Ard Ciannacht to meet with Cú Chulainn. Lon and Ualu and Díliu were their names; Mes Lir and Mes Laig and Mes Lethair were the names of their charioteers. They came to encounter Cú Chulainn because they deemed excessive what he had done against them the previous day, namely, killing the two sons of Nera mac Nuatair meic Thacáin at Áth Gabla and killing Órlám, the son of Ailill and Medb, as well and displaying his head to the men of Ireland. They came then that they might kill Cú Chulainn in the same way and bear away his head as a trophy. They went to the wood and cut three rods of white hazel to put in the hands of their charioteers so that all six of them together might fight with Cú
There came also Lethan on to his ford on the Níth in the district of Conaille Muirtheimne, to fight with Cú Chulainn. He attacked him on the ford. Áth Carpait was the name of the ford where they reached it, for their chariots had been broken in the fighting at the ford. Mulchi fell on the hill between the two fords, whence it is still called Gúalu Mulchi. Then Cú Chulainn and Lethan met, and Lethan fell by the hand of Cú Chulainn who cut off his head from his trunk on the ford, but he left it with it, that is, he left his head with his body. Whence the name of the ford ever since is Áth Lethan in the district of Conaille Muirtheimne.
Then came the harpers of Caínbile from Ess Ruaid to entertain them. The men of Ireland thought that they had come from the Ulstermen to spy on them, so the hosts hunted them vigorously for a long distance until they escaped from them, transformed into wild deer, at the standing-stones at Lia Mór. For though they were called the harpers of Caínbile, they were men of great knowledge and prophecy and magic.
Then Cú Chulainn vowed that wherever he saw Medb, he would cast a stone at her and it would not go far from the side of her head. It happened as he said. Where he saw Medb to the west of the ford, he cast a stone from his sling at her and killed the pet bird on her shoulder. Medb went eastwards over the ford, and he cast another stone from his sling at her east of the ford and killed the pet marten which was on her shoulder. Whence the names of those places are still Meide in Togmaill and Meíde ind Eóin, and Áth Srethe is the name of the ford across which Cú Chulainn cast the stone from his sling.