I didn't witness much of this one but the Irish under the vigorous leadership of Findabair met a force of Romans on the banks of a great river. Much blood was spilt , nearly all of it Roman, as the Commitatus proved as inept as usual and fled the fighting despite the enhanced leadership of a Tribune.
So, putting in in terms Gildas would approve ie never saw anything and wrote with a 5th century version of clickbait:-
Findabair gained glory as the dead fell around him. The great river filled with the corpses of his enemies so that it ran red from source to mouth. He spread terror as he moved through their lands, his actions as if to remove the Roman race itself from the land of Brittania.