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 legions of Caesar Octavian, and the Caesarian legions of Mark Antony who were besieging the troops of Decimus Brutus. The latter, one of Caesar's assassins, held the city of Mutina in Cisalpine Gaul.