the entire Legio II moved against the two cohorts under the command of Vibius Pansa to the left of Via Aemilia.

The fighting between the Caesarian veterans of both parties was dramatic and bloody; in his history, Appian describes the particular bitterness of the two parties to a fratricidal struggle. Mark Antony's Caesarians were angry at the defection of the legionaries of the Legio Martia, now allied with the Senate, while the latter legion wanted to take revenge for the decimations