Through the course of the campaign of 82 BC, the Populares forces had divided into two groups, those in the north under the command of Gnaeus Papirius Carbo, and those in the south who were commanded by Gaius Marius the Younger. Sulla had successfully defeated Marius Battle of Sacriporto and had managed to pin Marius and his fellow survivors under a siege at Preneste. Rome itself soon after had fallen to the Optimates. Soon after, the war had shifted to Etruria where Sulla engaged in a pitched cavalry skirmish against Populare forces near the Glanis River, emerging victorious. His forces managed to defeat those of Gnaeus Papirius Carbo after expelling Carbo from Picenum.