Fionn gathered the Fianna and travelled to the wood where he had a fidchell board set up, and played his son Oisín. Oscar and Cailte assisted Oisín in the game, since no one except Diarmuid was a match against Fionn in this game. Diarmuid watched the game from above, and couldn't resist aiding Oisín in the game by tossing berries at the pieces. Fionn lost three straight matches to his son. Fionn realised that the couple were hiding in the tree and ordered men to kill his rival. Diarmuid killed seven warriors named Garbh. Oscar, Fionn's grandson, warned that anyone who harmed Diarmuid would face his anger, and escorted the couple safely away through the forest.