The Macedonian Army: Recruitment, Equipment and Supply

The Macedonian army changed considerably between the reign of Philip II in the fourth century BCE and the end of the Antigonid kingdom’s last armed revival in 148 BCE. Philip built a more regularly drilled force from the resources of the kingdom in northern Greece. His son Alexander used that army as the core of a much larger force, adding allied, mercenary and, later, Asian troops as his campaigns extended across the Persian Empire. Under the Antigonid kings, the army again served a more geographically compact kingdom, with a larger role for the infantry phalanx and a smaller mounted force than Alexander had used.

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Recruiting soldiers and making a royal army

Before Philip II’s reforms, Macedonian infantry were largely farmers and shepherds with less regular training than the cavalry, which was drawn from the nobility. Philip made military service more sustained and organised. Peasants were enrolled as foot companions, or pezhetairoi, and trained through repeated drills. The king controlled their discharge. Accounts describe exercises as competitive events, encouraging soldiers and their units to improve their performance and cohesion.

The cavalry’s social base was different. The Companions, or hetairoi, were recruited from landed families and local elites. Philip also drew nobles from elsewhere in Greece into his service by settling military households on land acquired or confiscated during his expansion. Such settlers could serve as officers or cavalrymen. Control of the gold-bearing mines around Mount Pangaeum and of Amphipolis, an important regional centre, gave the king resources to maintain a larger force.

Macedonian troops formed the army’s core alongside allied contingents and paid mercenaries. Thracian light infantry and Paeonian horsemen supplied useful skills, while Thessalian cavalry were important allies. Alexander’s Asian campaigns added further contingents to this mixed force. Recruitment therefore depended on political alliances and access to money as well as the kingdom’s own population.

Antigonid recruitment followed the kingdom’s changing circumstances. Under Antigonus Gonatas in the third century BCE, the army appears to have relied heavily on mercenaries and a levy of farmers called up when a major campaign was expected. Garrisons and overseas operations were often entrusted to mercenaries. Financial pressure encouraged the king to hire Galatian and Celtic soldiers, described as less costly than Greek mercenaries. Later Antigonid kings built up the kingdom’s capacity to raise Macedonian troops, while continuing to use allied and hired forces.

The phalanx and its supporting infantry

The Macedonian phalanx was a close formation of infantry armed chiefly with the sarissa, a long pike that could exceed six metres. A phalangite held it in both hands, using a smaller shield suspended from the shoulder rather than the large shield of a traditional Greek hoplite. Several ranks could project their pikes beyond the front of the formation, creating a dense barrier against an approaching enemy. The arrangement was powerful on open, level ground but difficult to maintain on broken terrain and vulnerable if attacked from the flanks or rear.

The phalanx was divided into units with officers responsible for keeping ranks aligned and relaying commands. Later Greek tactical writers describe an ideal block of 256 men, arranged 16 deep and 16 across. Such diagrams help explain how a pike formation worked; Alexander’s campaign units, called taxeis, were larger bodies whose strengths changed with recruitment and losses. Trumpeters and other signals helped commanders transmit orders in battle.

The phalanx was not expected to do every task. Under Alexander, it commonly fixed or unsettled enemy forces while cavalry sought an opening for an attack. Elite shield-bearing infantry known as hypaspists could help connect the phalanx with the cavalry, protect its flank and take part in rapid operations or assaults on fortified places. Light infantry, including Agrianian javelin-throwers, and archers supplied missile fire and support on difficult ground.

In Antigonid armies, the name peltast could refer to a veteran, mobile infantry corps rather than simply a light skirmisher armed with a small shield. These elite soldiers fought beside the phalanx but could also be assigned ambushes, forced marches and special operations. The corps included the agema, an elite vanguard. The term hypaspist continued in use, but in later Macedonian armies it could refer to royal attendants and bodyguards rather than a separate battlefield regiment.

Cavalry and battlefield roles

Philip’s reforms made the Companions into a disciplined heavy cavalry force. They were divided into squadrons, usually recruited by region and led by an officer called an ilarch. The king’s own squadron was especially prominent. Under Alexander the organisation changed as the army grew: cavalry squadrons were grouped into larger commands, and officers could be chosen without regard to their regional origins.

A Companion typically fought with a long lance called a xyston, a sword and a helmet; many wore body armour. Squadrons could form a wedge, a shape that concentrated riders behind a point and allowed the unit to turn more readily than a square. Alexander often led the Companions in attacks against an exposed flank or a part of the enemy line already thrown into disorder. Their role was not simply to charge an intact, tightly packed infantry formation.

Thessalian cavalry, supplied by an allied Greek community, often guarded the army’s left flank while the Companions operated on the right. Lighter cavalry scouted, screened the army and harassed opponents. Macedonian forces also used Paeonian and Thracian horsemen. In Alexander’s eastern campaigns, Iranian horse-archers added a mobile missile force.

Antigonid armies generally fielded a smaller proportion of cavalry than Alexander’s expeditionary force. Their composition reflected changing resources, recruitment and alliances. Philip V employed Macedonian and Thessalian cavalry in 197 BCE, while Perseus also drew on allied Thracian horsemen. Cavalry still screened the infantry and contested the flanks even when it could not deliver Alexander’s characteristic decisive attack.

The changing balance had consequences. Antigonid armies relied heavily on the phalanx, but it still depended on other troops to protect its flanks. At battles such as Cynoscephalae in 197 BCE and Pydna in 168 BCE, the vulnerability of the formation when its ranks or flanks were disrupted became apparent.

Weapons, armour and military discipline

Phalangites carried a pike and a sword for close fighting, together with a helmet and greaves to protect the lower legs. Their shields had to leave both hands available for the long pike. The amount of body armour worn by ordinary pikemen under Philip and Alexander is disputed; elite troops and officers could have more substantial protection.

A military regulation from Amphipolis, associated with Philip V’s reign, imposed fines for missing equipment: two obols for a helmet, three for a sarissa and a drachma for a shield. Six obols made one drachma. The penalties made men responsible for maintaining their kit. The inscription also mentions a protective garment whose precise construction is debated, alongside metal body armour.

Written and visual evidence also shows that soldiers’ equipment was not limited to a single standard kit. Cavalry commonly used lances and swords, while light troops carried javelins, bows or other weapons suited to scouting and skirmishing. The army’s specialised units mattered because pikes, missiles and cavalry weapons each worked best in different circumstances.

Marching, provisions and the cost of war

Philip’s army was designed to move rapidly. He restricted wheeled transport and limited the number of camp servants, allowing one for every ten infantrymen and one for each cavalryman. A smaller baggage train helped the army march quickly, while repeated drills prepared its soldiers to move and form up efficiently. Speed could give the Macedonians an advantage over opponents who did not expect them to arrive so soon.

Maintaining an army also depended on the kingdom’s revenues and stores. Philip’s control of mines and important territory supported military expansion. Under Philip V, measures to increase royal income included opening new mines, deepening existing ones and raising agricultural and harbour revenues. After his defeat at Cynoscephalae, he also took steps to enlarge the kingdom’s manpower. In 187 BCE, groups of people from coastal towns were moved toward the northern frontier, while Thracians were settled in districts left vacant. The policy tied population movement to frontier defence and the king’s ability to recruit.

Perseus prepared for war by accumulating grain, money and weapons. A store of food could support mobilisation, while coin paid mercenaries and purchases. Once troops left their bases, commanders still had to arrange deliveries and find water along the route. Horses and pack animals increased the amount that an army could carry but also consumed supplies.

Arrian’s account of Alexander’s march through Gedrosia in 325 BCE shows how these arrangements could fail. Grain seized inland was loaded onto animals and sent towards the coast for the fleet, but starving escorts consumed it. Scarce water forced unusually long marches; the loss of pack animals then made it harder to move baggage or exhausted men. Here supply failure progressively reduced the army’s ability to carry the supplies it still needed.

From Alexander’s empire to the last Antigonid campaigns

Alexander’s army changed as it moved farther into Asia. Local soldiers joined the force, and Alexander had Persian aristocratic youths trained in Macedonian methods and enrolled in the cavalry. In 324 BCE, he reportedly reviewed 30,000 Persians trained to fight in the Macedonian manner. The policy caused resentment among some Macedonians, particularly as Persian recruits entered elite units. Alexander planned a larger role for locally recruited troops, but his death in 323 BCE interrupted that project. His successors generally relied more heavily on Macedonians and Greeks.

The Antigonid army preserved the phalanx and royal cavalry traditions but adapted them to the needs and resources of the restored Macedonian kingdom. Inscriptions from the reign of Philip V record officers called tetrarchs and clerks who assisted them, evidence of the administrative organisation behind the field force. The army’s size and composition varied: its manpower could expand through recruitment, settlement and years of preparation, but it could also depend on mercenaries and allies when royal resources were limited.

Perseus’s defeat at Pydna in 168 BCE ended the Antigonid monarchy. A brief later attempt to restore Macedonian kingship came under Andriscus, a claimant who gained Thracian support and recruited light infantry and cavalry. Rome defeated him in 148 BCE. This final episode closed the period of Macedonian royal armies considered here.

For the wider setting, see Macedonia: Kingship, Expansion and Society in the Ancient Kingdom.