The Annals of the Four Masters describes the battle as follows: A great army was led by Maurice Fitzgerald, and the other English chiefs, first to Sligo, and thence to the cataract (Assaroe Falls) of Aedh Roe, the son of Badharn.
O'Donnell assembled the Kinel-Connell and Kinel-Owen against them, so that they did not allow a single man, either English or Irish, to cross the ford of Ath Seanaigh for a whole week.
O'Donnell was slain on the spot, as well as the Cammhuinealach Wry-necked O'Boyle, the head Chieftain of the Three Tuathas, Mac Sorley, Lord of Argyle, and other chiefs of the Kinel-Connell.
The country was then plundered and desolated by them the English, and they left the chieftainship of the Kinel-Connell to Rory O'Canannan on this occasion.The Annals of Lough Cé describes the battle as follows: A great hosting by Maurice Fitz-Gerald, and the foreigners along with him, until they reached Sligech in the first instance, and from thence to Es-Ruaidh-mic-Badhuirn, on the Wednesday after the festival of Paul and Peter; and Cormac, son of Diarmaid, son of Ruaidhri O'Conchobhair, went there in his host and muster.
O'Domhnaill assembled the Cenel-Conaill and Cenel-Eoghain to meet him at Bel-atha-Senaigh, so that they allowed neither Foreigners nor Gaeidhel to cross the ford during the space of a whole week; when they determined that Cormac O'Conchobhair should go, with a large force of cavalry, eastwards along the plain, and then turn upwards through the plain by the margin of the bog; and he then proceeded eastwards along the river until he reached Ath-Chuil-uaine on the Erne.