 The retreat soon proved a disaster as Antony's demoralized army faced increasing supply difficulties in the mountainous terrain during winter while constantly being harassed by the Parthian army.According to the Greek historian Plutarch, eighteen battles were fought between the retreating Romans and the Parthians during the month-long march back to Armenia, with approximately 20,000 infantry and 4,000 cavalry dying during the retreat alone.Once in Armenia, Antony quickly marched back to Syria to protect his interests there by late 36 BC, losing an additional 8,000 soldiers along the way.