Around one year after Julius Caesar's murder, negotiations between the Roman Senate and Antony broke off. Antony gathered his legions and marched against one of the assassins Decimus Junius Brutus Albinus, who was governor of Cisalpine Gaul.
Mark Antony had Decimus Brutus confined around Mutina (modern Modena), just south of the Padus (Po) River on the via Aemilia. Pansa was sent north from Rome to link with Hirtius and Octavian in order to provide Brutus with aid. On April 14, Antony's legions collided with those of Pansa, in the village of Forum Gallorum. In the ensuing Battle of Forum Gallorum, Pansa's troops were routed and the general mortally wounded. However, instead of gaining a decisive victory, Antony was forced to withdraw when reinforcements under Hirtius crashed into his own exhausted ranks.