The Romans had at least 28,600 men, up to 37,000, of which 22,000 to 34,000 were infantry: Romans, Italians, and allies from
Greece,
Numidia, and
Liguria, as well as possibly
Hispania. The Macedonians had 43,000 soldiers at the start of the war, of which more than 20,000 were
phalangites. The
cavalry forces were roughly equal, up to 4,000 Macedonians and
Thracians against some 3,400 Romans and allies. By the time of the battle, the Macedonian army numbered closer to 30,000 men. For example, prior to the battle Perseus dispatched 8,000 of his Macedonians to guard against the Roman fleet threatening his rear: 2,000 peltasts, 5,000 phalangites, and 1,000 cavalry. The two armies were drawn up in their usual fashion. The Romans had placed the two legions in the middle, with the allied Latin, Italian, and Greek infantry on their flanks. The cavalry was placed on the wings, with the Roman right being supplemented by 22
war elephants. The phalanx took up the center of the Macedonian line, with the elite 3,000-strong
Guard formed to the left of the phalanx. Lighter
peltasts, mercenaries, and Thracian infantry guarded the two flanks of the phalanx, while the Macedonian cavalry was also most probably arrayed on both flanks. The stronger contingent was on the Macedonian right, where Perseus commanded the heavy cavalry (including his elite Sacred Squadron), and the
Thracian Odrysian cavalry were deployed. However, other sources state that the cavalry did not participate in the fight, as there was a strike against Perseus by the nobles. The two centers engaged at about 3 PM, with the Macedonians advancing on the Romans a short distance from the Roman camp. Paullus claimed later that the sight of the phalanx filled him with alarm and amazement. The Roman allies tried to beat down the enemy pikes or hack off their points, but with little success. Roman allies' officers began to despair. One 'rent his garments' in impotent fury. Another seized his unit's standard and threw it among the enemy. His men made a desperate charge to recapture it, but were beaten back despite inflicting some casualties. Unable to get under the thick bristle of pikes, the Romans used a planned retreat over the rough ground. But as the phalanx pushed forward, the ground became more uneven as it moved into the foothills, and the line lost its cohesion, being forced over the rough terrain. Paullus now ordered the legions into the gaps, attacking the phalangites on their exposed flanks. At close quarters the longer Roman sword and heavier shield easily prevailed over the Macedonian
Kopis and lighter shields of the Macedonians. They were soon joined by the Roman right, which had succeeded in routing the Macedonian left. Seeing the tide of battle turn, Perseus fled with the cavalry on the Macedonian right. According to
Plutarch, Perseus' cavalry had yet to engage, and both the king and his cavalry were accused of cowardice by the surviving infantry. Poseidonius claimed that the king was injured by enemy missiles and was brought to the city of Pydna at the start of the battle. However, the 3,000 strong guard fought to the death, nearly 11,000 Macedonians were captured, and Livy reported that his various sources claimed up to 20,000 Macedonian dead. The battle lasted about an hour, but the bloody pursuit lasted until nightfall. Other reports state that due to confusion or tactical error from the king, a corps of 10,000 Macedonians were cut off and did not participate in the engagement. There were several heroes among the Romans. Paullus's son
Scipio Aemilianus was thought to be lost for a while, but he and some friends had been pursuing the retreating Macedonians. The son of
Cato the Elder,
Marcus Porcius Cato Licinianus distinguished himself in the battle by his personal prowess in a combat in which he first lost and finally recovered his sword. The battle is often considered to be a victory of the Roman legion's flexibility over the phalanx's inflexibility. From the case of the 3,000 Agema peltasts, who maintained cohesion far longer than the regular phalanx, it may be concluded that the training levels of the troops involved played an important role in determining both the frontal strength of the pike phalanx and the success of infantry trying to break through the pike wall. ==Aftermath==