Campus Castorum (Revolt of Vitellius).
Fought in 69 between the revolted legionaries, 70,000 strong, under Valens and Cæcina, and the army of the Emperor Otho under Suetonius Paulinus. The Imperial troops gained some advantage, but Suetonius did not consider himself strong enough to follow it up, and was relieved of his command by Otho.