Táin Bó Cúailnge
During the "Táin Bó Cúailnge" ("cattle raid of Cooley"), Amergin held up the advance of the Connachta army by pelting them with enormous stones for three days and nights. The Munster hero Cú Roí, who was with the army, threw stones back at him, and the stones smashed together in mid-air, showering the area with bits of stone, until Medb begged them both to stop. They came to an agreement that both would stop, and Cú Roí would return to Munster, but once he had gone, Amergin resumed throwing stones, arguing his agreement was only with Cú Roí. Eventually he agreed to withdraw until the final battle (a variant version of this episode appears in the first recension of "Táin Bó Cúailnge", where the combatants are Cú Roí and Munremar mac Gerrcind).