Having fortified Nantes, Renaud heard that Nominoe had been incapacitated by a serious illness. Renaud decided to take the initiative, by raiding into Breton territory. At the junction of the
diocese of Alet and
county of Nantes, on the Roman road of Angers Carhaix he surprised the Breton army led by Nominoe's son Prince
Erispoe. At the
Battle of Messac, Erispoe was initially defeated by Renaud. Shortly afterwards, however, the timely arrival of Lambert's troops allowed Erispoe to counter-attack in force, defeating Renaud. Renaud himself was killed the day afterwards, during the pursuit. The Bretons may also have been assisted by the Viking warlord
Håstein, who is said to have personally killed Renaud. However, other sources assert that Lambert killed Renaud and that the Viking force arrived shortly afterwards, looking for plunder. ==Aftermath==