 Complete the following phrase:  Having regained his health, Nominoe took command once more. The victory at Blain having secured control of Nantes and Rennes, he raided into Frankish territory, defeating the Franks at the Battle of Ballon in 845. A truce followed, but after Charles regained control of Nantes, Nominoe and Erispoe renewed their offensive in 849. While on campaign, Nominoe died suddenly. Erispoe was proclaimed leader, but immediately after his fathers death, his power was challenged by Charles the Bald, still his nominal suzerain. Charles crossed the river Vilaine with an army. Erispoe defeated Charles in the decisive 