In a year given as 485, Coirpre was credited with a victory at Grainert, perhaps modern Granard, where the chief church of Cenél Coirpri Mór of Tethbae was in later times. In the addition, which notes that the battle was won by "Mac Ercae as some say," the annal adds that Fincath mac Garrchu of the Dál Messin Corb, perhaps king of Leinster, was killed there. A second battle at Grainert is recorded under the year 495, repeated under 497, and here Fincath's son Fráech is said to have been killed by Coirpre's son Eochu.