Battle of Forum Gallorum in the context of Modena

The War of Mutina (December 44 – April 43 BC; also called the Mutina war) was a civil war between the Roman Senate and Mark Antony in Northern Italy. It was the first civil war after the assassination of Julius Caesar. The main issue of the war was attempts by the Senate to resist Antony's forceful assumption of the strategically important provinces of Transalpine and Cisalpine Gaul from their governors. The Senate, led by Cicero and the consuls (Aulus Hirtius and Gaius Vibius Pansa), attempted to woo Julius Caesar's heir (today known in this period as Octavian) to fight against Antony. Octavian, however, would pursue his own agenda.

The consuls, with Octavian, led troops into northern Italy against Antony and won two battles at Forum Gallorum and Mutina (14 and 21 April 43 BC). After the two consuls were mortally wounded at those battles, there emerged a political vacuum. Octavian – with the support of his men – demanded the consulship from the Senate and marched on Rome. After taking control of the city, Octavian and one of his kinsmen, Quintus Pedius, were irregularly elected consuls. They forced through legislation which had the effect of outlawing Julius Caesar's killers before starting negotiations with Antony. The negotiations resulted in the two men reconciling. With Lepidus, they then formed the Second Triumvirate.

Castelfranco Emilia (Western Bolognese: Castèl; Modenese: Castèlfrànc) is a town and comune in Modena, Emilia-Romagna, north-central Italy. The town lies about 25 kilometres (16 mi) northwest of Bologna.

Castelfranco either occupies or lies near the site of the ancient Forum Gallorum, a place on the via Aemilia between Modena and Bologna. Near the town, on 14 April 43 BC, Octavian and Hirtius defeated Mark Antony in a battle during the War of Mutina. The village never gained prominence in ancient times. While it was included in the Tabula Peutingeriana, it was omitted from all other Roman road itineraries.

Gaius Vibius Pansa Caetronianus (died 23 April 43 BC) was consul of the Roman Republic in 43 BC. Although supporting Gaius Julius Caesar during the Civil War, he pushed for the restoration of the Republic upon Caesar’s death. He died of injuries sustained at the Battle of Forum Gallorum.

The Battle of Mutina took place on 21 April 43 BC between the forces loyal to the Senate under consuls Gaius Vibius Pansa and Aulus Hirtius, supported by the forces of Caesar Octavian, versus the forces of Mark Antony which were besieging the troops of Decimus Brutus. The latter, one of Caesar's assassins, held the city of Mutina (present-day Modena) in Cisalpine Gaul.

Six days earlier, the Battle of Forum Gallorum had ended with heavy losses on both sides and the mortal wounding of consul Pansa. Hirtius and Octavian then launched an attack on Antony's camp, seeking to break the siege. Amid bloody fighting, Hirtius was killed, leaving the army and republic leaderless. Octavian saw action in the battle, recovered Hirtius' body, and managed to avoid defeat. Decimus Brutus also participated in the fighting with part of his forces locked up in the city. Command of Hirtius' legions then devolved to Caesar Octavian. Decimus Brutus, marginalized after the battle, soon fled Italy in the hopes of joining fellow assassins Marcus Junius Brutus and Gaius Cassius Longinus; he was, however, captured and executed en route.