In May, Guerin, as dux cum Tolosanis et Provincianis, joined Charles and the king of Bavaria, Louis the German, at Châlons-sur-Marne.
Pada bulan Mei, Guerin, seperti dux cum Tolosanis et Provincianis, bergabung dengan Karl dan raja Bayern, Ludwig si Jerman, di Châlons-sur-Marne.