"The Parthian shot was a military tactic made famous by the Parthians, an ancient Iranian people. The Parthian archers mounted on light horse, while retreating at a full gallop, would turn their bodies back to shoot at the pursuing enemy. The maneuver required superb equestrian skills, since the rider's hands were occupied by his bow."
Carrhae. 53 BC. The head of Publius Licinius Crassus is presented to Surena the Parthian general after Publius was surrounded and his force of Gallic cavalry destroyed. The Parthians then pushed the head onto a spear and paraded it in front of the main Roman position and of course his father Marcus Licinius Crassus.
The Battle of Carrhae was fought in 53 BC between the Roman Republic and the Parthian Empire near the town of Carrhae. The Parthian Spahbod ("General") Surena the Iranian decisively defeated a numerically superior Roman invasion force under the command of Marcus Licinius Crassus. It is commonly seen as one of the earliest and most important battles between the Roman and Parthian empires and one of the most crushing defeats in Roman history.
A denarius struck in 19 BC during the reign of Augustus, with the goddess Feronia depicted on the obverse, and on the reverse a Parthian man kneeling in submission while offering the Roman military standards taken at the Battle of Carrhae