The Hellenistic armies is the term applied to the armies of the successor kingdoms which emerged after the death of Alexander the Great. After his death, Alexander's huge empire was torn between his successors, the Diadochi. During the Wars of the Diadochi the Macedonian army, as developed by Alexander and Philip II, gradually adopted new units and tactics, further developing Macedonian warfare. The armies of the Diadochi bear few differences from that of Alexander but during the era of the Epigonoi (Successors), the differences were obvious, favoring numbers over quality and weight over maneuverability. The limited availability of Greek conscripts in the east led to increasing dependence on mercenary forces, whereas in the west, Hellenistic armies were continuously involved in wars, which soon exhausted local manpower, paving the way to Roman supremacy. The major Hellenistic states were Seleucid Empire, Ptolemaic Egypt, the Antigonid kingdom (Macedonia), smaller states: Attalid Pergamum, Pontus, Epirus, the Achaean League, the Aetolian League, Syracuse, and other states (like Athens, Sparta etc.).
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The Diadochi were capable of deploying some of the largest armies of their day, and could easily outmatch the numerical strength of either Phillip II or Alexander's Macedonian full strength contingents. However, the size of the armies participating in different campaigns could vary extremely, from a few thousand to over 70.000. Of these armies, outside Greece, only a fraction would have been of Greek origin, the rest being allied contingents and conscripts from the local population.
The lack of manpower was a serious concern for many Hellenistic rulers. In fact 'the disparity between manpower reserves available to Rome and to any Hellenistic monarch had profound influence on the way in which the opponents made war'.[1] Roman generals could more easily risk defeat in battle, while for Hellenistic generals a defeat might cripple their manpower base for nearly a generation. Many states had to rely on mercenaries to bulk up their citizen forces, For example the army of the Achaean League under Aratus of Sicyon was re-organized to contain a permanent corps of mercenaries that numbered 8,000 foot and 500 horse compared to the corps of picked Achaean troops which numbered 3,000 foot and 500 horse.[2]
To take another example, by the mid-third century BC the Spartiate citizen population had decreased to a tiny fraction of what it had been at the time of the Persian Wars (Cleomenes' army could only field about 5,000 men[3]). The inchoate reforms of Agis IV in the 240's BC had failed after a reaction by those opposed to the reforms. The problem of the lack of man-at-arms was then taken up by Cleomenes III of Sparta who attempted to address it by his radical reforms. Cleomenes III launched a coup against his rivals at home and used their demise to push forward reform to increase Spartan manpower. In 227 BC Cleomenes cancelled all debts, pooled and divided the large estates and increased the citizen body by enfranchising 5,000 Perioikoi and 'metics' (resident foreigners). Before long he increased the citizen body further by allowing Helots to buy their freedom for 5 minae and therefore he 'acquired 500 talnets, some of which he used to arm 2,000 men in the Macedonian fashion as phalangites'.[4] However the defeat at Sellasia in 222 BC and the attendant great loss in manpower led to reliance on mercenaries, who were the basis of power for Machanidas and Nabis, the successors of Cleomenes III.
The great losses affected Philip V of Macedon greatly, especially after his defeat at Cynoscephalae in 197 BC. With such a small population and such drastic losses in battle the Antigonid king had to think radically of how to improve his states performance in the next war. In between the Second and Third Macedonian Wars Philip V embarked on a major reform and re-organization of the kingdom. Expansion could ensure to get 'the great reservoir of available man-power' [5] that laid north in Thrace. Philip then transported segments of the populations of the coastal cities to the northern forntiers and moved those Thracians south. This, combined with economic and political moves, re-built Macedonia and allowed for Perseus, Philip's successor, to be in a stronger position. Perseus had enough grain last the army 10 years (without drawing on harvests), enough money to hire 10,000 mercenaries for 10 years, and field an army of 43,000 men.[6] Compare this size to that of Philip V at Cynoscephalae in 197 BC, an army of 25,500 men. The eastern kingdoms, for example the Ptolemaic, Seleucid, Graeco-Bactrian and Indo Greek kingdoms, had an even more problematic situation. The basis of their militaries relied on Macedonians and Greeks, which were obviously not common to the areas that they ruled over. In order to overcome this these kingdoms set up military colonies, known as Klerouchoi, to settle mercenaries and others from Macedon and Greece. The system would allow for the colonists to be given a plot of land and in return they would provide military service when needed. In Ptolemaic Egypt, for example, soldiers and officers were given lots 'in exchange for military service, whenever needed'.[7] W.W. Tarn even suggests that the Greek (known to the Indians as 'Yavanas') population in India may not have been as small as one would suppose stating 'there may well have been many more Yavanas...than we should suppose; we may have to reckon with a considerable number of men, adventurers or mercenaries from the west'.[8]
The Hellenistic armies based their strength on the phalanx of the sarissofroi, the legacy of Philip II and Alexander the Great. Throughout the age of the Diadochi and the Epigonoi, the phalanx, as the line of the pikemen was commonly referred to by ancient authors, remained the backbone of armies as diverse as those of Antiochus III and Philip V. The phalanx was an infantry formation, characterized by dense ranks, and long, forward projecting long spears (sarissae). Their soldiers (known as phalangites) ranged from professional warriors, drilled in tactics, weapon use and formation, typically of Greek origin to basically trained, non-Greek villagers, as was the case in the army of Ptolemy Philopator, the victor of Raphia. Certain reforms in the weight of the phalangite equipment and the conscription methods used, turned the phalanx from a maneuverable formation into a bulky, slow moving steam roller, whose charge no enemy was able to withstand. Maneuvers like the fake retreat of Phillip II at Chaeronea or the oblique advance of Alexander at Arbela were never again attempted, but still, as long as the phalanx remained on relatively level terrain and its flanks were kept secure, it was not conquered by any other formation. Although it has been argued that the role of the phalanx on the battlefield was to act as an anchor for the entire army, holding the enemy in place, pushing him back, exerting a heavy toll on enemy morale, while the cavalry struck the enemy flanks and delivered the fatal blow to cripple their opponents, in most battles it was used as the main weapon to achieve victory. Equipment varied over the years, and was also dependent on the geographical region, the preference/wealth of the ruler, and the assets of the individual soldier.
Helmets ranged from simple, open-faced affairs to stylized Thracian models (complete with mask-like cheek protectors that often imitated a human face). Historians argue about how common body armour would have been among phalangites (especially those in the middle ranks), but when it was worn it ranged from a cuirass of hardened linen (the linothorax), that may or may not have been reinforced/decorated with metal scales to metallic (typically bronze) breastplates.
The phalangite's shield - long misconstrued thanks to its description as a "buckler" by several writers - was a 2-foot (0.61 m)-diameter affair and less concave than the hoplite's aspis. It was secured by both a shoulder harness and a fore-arm brace, allowing the off-hand to release the hand-grip and make wielding the enormous sarissa pike possible. Metallic greaves were also worn (especially by the front and rear-most ranks) to cover the shins of the soldier as he stood his ground.
The primary weapon of the phalangite was the sarissa, a massive spear that ranged from 16 feet (mid-late 4th century BCE) to as much as 22 feet (near the nadir of the phalanx's development). First made famous by Philip of Macedon, it allowed Macedonian infantry to "outrange" the opposition's existing spear formations by several feet. The sarissa would have been largely useless in single combat, but a compact, forward-facing infantry formation employing it would have been almost impossible to challenge. The first 5 ranks of the phalanx would have their sarissai projecting horizontally to face the enemy, with the remaining ranks angling theirs in a serried fashion, often leaning against their fellows' backs. If front-rankers were killed, those behind would lower their spears and step forward to maintain a solid front.
In the event of close combat, or in circumstances where the sarissa was impractical, a variety of swords were employed - the classic xiphos, the kopis and the makhaira, for example. It goes without saying that any sword-fighting in vicinity to the phalanx's front was complicated by the sarissai projecting from the 2nd-5th ranks around the 1st rank combatants.
The primary drawback of the phalanx was its vulnerability to attacks from the rear and flanks. This is the reason why it depended on the units on its flanks to at least hold off the enemy until he would naturally break from the phalanx's irresistible pressure. It also had a tendency to fracture when led across broken terrain for extended periods of time in close ordered battle formation. The Romans would later be able to use this weakness against the phalanx as their more mobile maniples could withstand the pressure of the phalanx longer than more traditional formations, thus earning valuable time for their wings to outflank it (battle of Cynoscephalae, battle of Magnesia) or for the phalanx to lose its cohesion due to prolonged movement forward or advancement to unfavorable terrain (battle of Pydna). Yet, regardless of the many Roman victories against the Hellenistic Kingdoms, the legion never won against a phalanx by frontal assault. Even in Pydna, it took the strange withdrawal of the Macedonian cavalry for the Romans to finally outflank the phalanx and claim a bloody victory.
As the reign of the Diadochi persisted (from the late 4th century to the mid-1st century BCE), they grew to rely more and more upon an increasingly heavier and longer-speared phalanx to ensure victory. Complementary arms of the later Hellenistic armies were neglected, fell into disuse, or became the province of unreliable mercenaries and subject peoples. Sound and creative tactics became increasingly rare, and were replaced by the belief that unbreakable phalanx walls could carry the day.
Historians and students of the field alike have often compared the Hellenistic-era phalanx with the Roman legion, in an attempt to ascertain which of the formations was truly better. Detractors of the former point that in many engagements between the two (such as at Pydna and Cynosephalae), the legion was the clear victor, and hence represented a superior system. Opposing schools of thought, however, point to the Pyrrhic and Hannibalic victories as evidence to the contrary. Finally, one might note that these were not conflicts that solely featured Republic Roman Legionnaires engaged against Hellenistic phalangites. The Roman victories of Magnesia, Cynoscephalae and Pydna were won by armies that included thousands of non-Roman (often Hellenic) cavalry, elephants as well as heavy and light infantry. Such a comparison was also attempted in the ancient days, as is attested by Polybius' own effort to explain why the Macedonian sarissa was eventually conquered by the Roman gladius, but in the end, we should acknowledge that such a juxtaposition can be misleading, since both infantry formations had clear advantages and disadvantages that were historically oftentimes exploited.
Numerous individual units of the phalanx infantry are attested in use during the Hellenistic period. Some of the old Alexandrian unit names were kept and units were named after Alexander's. An example of this are the Argyraspides ('silver shields'), who were originally a unit of Alexander's most fearsome and disciplined veterans. However they were disbanded not long after having surrendered their commander Eumenes to Antigonos the One-Eyed. The name however was kept alive and formed into a corps of the Seleucid army. Livy describes them as a Royal Cohort in the army of Antiochus the Great. Fighting in phalanx formation the Argyraspides were present at Raphia (217 BC) and at Magnesia (190 BC). Chosen from across the kingdom, they constituted a corps of roughly 10,000 men. By the time of Antiochus Epiphaness parade at Daphne in 166 BC the Argyraspides are counted as being only 5,000 strong. However Bar-Kochva is of the opinion that the 5,000 men dressed and armed in the 'Roman' style counts for the other half of the corps. This is because the men of the 'Roman Contingent' are described as being in their prime of life.
In the Ptolemaic army the Graeco-Macedonian troops formed the phalanx. But Ptolemy IV and his ministers reformed the army in order to keep up manpower by allowing the native Egyptian warrior class, the Machimoi, into the phalanx. Up until that point the Machimoi had only performed auxiliary duties such as archery, skirmishing and so on. The Machmioi Epilektoi, or 'Picked Machimoi', first saw service at the battle of Raphia and from then on were featured in more important positions within the Ptolemaic army.
It was customary for the Hellenistic warlords to name individual units of phalangites according to the color of their shields. Thus, the phalanx of the Hellenistic armies used terms such as Chrysaspides ('gold-shields'), Chalkaspides ('bronze-shields') and Leukaspides ('white-shields') to denote formations within their phalanxes, the two latter being important in the composition of the Antigonid phalanx. Antigonus Doson armed the citizens of Megalopolis as Bronze Shields for the Sellasia campaign in 222 BC. These units are mentioned by classical writers when describing the Antigonid army in battle. Although these units most probably ceased to exist after the battle of Pydna in 168, as the Antigonid kingdom had been crushed by Rome. These names were not only limited to the Antigonid (or Achaean) phalanx though. Plutarch tells us of Mithridates VI the Great having a corps of 'Chalkaspides' against Sulla at Chaeroneia.[9] Leukaspides are mentioned in the army of Pyrrhus of Epirus on his campaigns in Italy.Under Cleomenes III the Spartan army was reformed in 228 BC. Until then the Spartans had merely kept the traditional hoplite spear. Cleomenes created a 4,000 strong phalanx and then formed another phalanx with 2,000 freed helots in order to counter the Antigonid Leukaspides. Philopoemen reformed the army of the Achaean League into the Macedonian phalanx in 208-07 BC and we are told that by the end of the 3rd century the Boeotians did the same creating the 'Peltophoroi'.
In his description of the Battle of Cynoscephalae, Polybius informs us of a unit he calls Peltasts, which he clearly places among the phalanx. Although the Macedonian shield could be characterized as a pelti (targe), the term was usually used to describe a type of shielded, skirmishing, light infantry. It has been suggested that these peltasts were indeed a picked corps, much like Alexander's hypaspists, 'an infantry force...which fought beside the phalanx in battle, but at other times employed for ambushes, forced marches and special expeditions'.[10] The Peltasts were sent on special missions, such as an ambush in Lycestis [11] or their use as shock troops in the storming of Cephallenia.[12] The elite of the Peltast corps was known as the 'Agema'.
The term peltast has also been coined by Diodorus Siculus to describe the Iphicratean hoplite, a type of hoplite introduced by the Athenian general Iphicrates, equipped with a lighter armor, a longer spear and a smaller shield.[13] It could be that the peltasts of Polybius were similarly equipped.
New troop types such as the Thureophoroi and the Thorakitai were developed. They used the Celtic Thureos shield, of an oval shape that was similar to the shields of the Romans. The Thureophoroi were armed with a long thrusting spear, a short sword and, if needed, javelins. The Thorakitai were similar to the Thureophoroi but different in the sense that they were more heavily armoured, as their name implies, usually wearing a chain-mail shirt. These troops were used as a link between the light infantry and the phalanx, a form of medium infantry to bridge the gaps. Numerous armies used this form of troop, for example the Achaean League's armies before Philopoemen. By the end of the 3rd century BC the 'Macedonian' phalanx had become the dominant fighting style even for states such as Sparta .
Both the Thureophoroi and the Thorakitai were able to fight both in a phalanx formation, armed with long spears, or in more loose, irregular formations to be used against enemy light infantry or to occupy difficult terrain.
Reforms in the late Seleucid and Ptolemaic armies re-organised them and tried to add some Roman aspects to formations. This however would not be out of place as some Roman style tactics were used by Pyrrhus of Epirus in his campaigns against the Romans and by Antigonus Gonatas at Sellasia in 222 BC. Pyrrhus and Antigonus both placed units of lighter troops in between the units of their phalanx. This was after Pyrrhus had 'observed the formation of the Roman legions and noticed how mobile they were and how unwieldy were his own forces...He therefore adapted his own formation to the Roman model, deploying light mobile detachments alongside the phalanx'.[14] Philopoemen too used this tactic at Mantinea in 207 BC, making his phalanx more flexible.[15] Much is made of Polybius' description of 5,000 Seleucid infantryman in 166 BC armed in the 'Roman' fashion at a parade at Daphne. 'Romanized' troops are also mentioned in battle against the Maccabee's.[16] These reforms were probably undertaken by Antiochus IV because of several factors. Firstly Antiochus IV had 'had spent part of his early life in Rome and had acquired rather an excessive admiration for Rome's power and methods'.[17] Secondly to re-train the army in this manner would allow it to perform better in the Seleucid empire's eastern satrapies beyond the river Tigris, which of high importance to Seleucid rulers from Antiochus III through to Demetrius II. Thirdly changing their equipment and training would add to their fighting capability and efficiency, hence making the army more maneuverable. Stelae from Hermopolis shows a Ptolemaic unit which showed them having a standard-bearer and other staff attached to the unit. This unit was like a Roman Maniple, being composed of 2 smaller units led by a Hekatontarch (i.e. a Centurion). This title of Hekatontarch appeared around the 150's BC. As well as this Asclepiodotus describes in his 'Tactica' a new institution, the Syntagma. The Syntagma had a standard-bearer, other staff and was composed of 2 smaller units led by Hekatontarchs. The Phalangarkhia, also described by Asclepiodotus, was about the size of a Roman Legion in strength. The potential Roman influence would have been great. In Ptolemaic Egypt Roman adventurers and veterans are found commonly serving under the Ptolemies. Romans are found in Ptolemaic service as early as 252/1 BC.[18] The Ptolemaic army was odd in that out of all the Hellenistic armies the Ptolemaic was the only army where you could find Romans in Greek service. As Sekunda suggests 'such individuals would have spread knowledge of Roman military systems within the Ptolemaic military and political establishment'.[19] However there are numerous aspects of the Roman army that were not carried into the Ptolemaic and Seleucid ones. For example the differentiation of the Hastati, Principes and Triarii, or the integration of light-armed troops into the infantry structure. Hence because of this, there was no Hellenistic equivalent to the Cohort. Instead of this there was a system of larger units which had no relation to Roman organization. In terms of equipment, most of these so-called 'Romanized' troops did not abandon their traditional spear for a sword and pila, weapons so vital to the Roman way of war. In this sense, we can only assume that the Hellenistic kingdoms did reform and re-organize their troops in some regards along Roman lines, but these appear to be superficial at best. By the time of Mithridates VI we are told that the Pontic army had troops armed in the Roman fashion and by 86 BC Mithridates had created an army of 120,000 such troops.[20] This was after an alliance between Mithridates and Sertorius, an enemy of Sulla, in which Sertorius sent a military mission to reorganize Mithridates' army along Roman lines.[21] These 'Roman' troops fought alongside the Pontic phalanx. 'Legions' of this sort are described by Julius Caesar in his campaigns against Juba in Numidia [22] and alongside Deiotarus of Galatia whilst in the Middle East.[23] If anything, these forces, as described by N. Sekunda, are nothing more than ersatz-legions.
The cavalry organization differed in the various Hellenistic states. Different variants of tactical formations were used to organise the state's cavalry, although there are cross-overs and similarities between different kingdoms. The Boeotian League's cavalry was commanded by a Hipparchos and each cavalry squadron (ile, pl. ilai) was led by an ilarchos. They also had a tarantinarchos who commanded the League's Tarantine skirmishing cavalry.
The Aetolian League became well known for its cavalry and by the end of the 3rd century they were considered the best in Greece. Despite this fact, cavalry remained only a small proportion of its total military force. We can deduce this from the 400 cavalry accompanying 3,000 foot in campaign in 218 BC. All we know of specific organisation is a reference to oulamoi, small squadrons of uncertain strength.
The cavalry of the Achaean League was supposedly inefficient. Philopoemen, in the late 3rd century, having already reformed the foot soldiers into a Macedonian-style phalanx, also reformed the cavalry. The Achaean cavalry was organised into lochoi, files of 8 men, who were then grouped into dilochiai, double files of 16, then grouped into oulamoi of 32, ilai of 64, hipparchiai of 128 and syntagmata of 256.
The Antigonid kingdom of Macedon's cavalry only constituted a small fraction of the army. Duncan Head estimates this fraction between 5 to 10% of the total strength of the Antigonid armies. This may well be due to over-campaigning, high casualties or even because many of the Macedonian noblemen who formed much of the heavy cavalry of Philip II and Alexander went east and never came back. But by the time of Philip V and Perseus, cavalry strength had slowly increased. Philip V did have a cavalry force of 400 'Household' cavalry, called the Royal or Sacred Ile in a campaign in 219 BC. The small amount of native horse were then supplemented by mercenary cavalry.
In Ptolemaic Egypt the cavalry forces were led by a hipparchos who commanded a hipparchia. The hipparchiai were divided into ilai, then into lochoi and then into dekades (sing. dekas, a file of 10 men). Hipparchiai fall into 2 categories. There were 5 known hipparchiai in the 3rd century, of which the 4th and 5th are known to have been in existence in the 2nd century BC. Other than these, there were 4 hipparchiai of lower status known by 'ethnic' names; the Thessalians, Thracians, Mysians and Persians. These probably were not actual cavalry troops from those ethnic groups, but more like the Tarantine cavalry mercenaries who did not need to be from Taras to be called thus.
The Seleucid empire's cavalry were placed in units of oulamoi and then into divisions of ilai. Other than the usual auxiliary, citizen and militia cavalry units, the main elite cavalry units of the Seleucids were the Agema and the Hetairoi ("Companions"). The Hetairoi were the standing elite cavalry unit of the Seleucid army. They served in peace and war. The Agema were recruited from the Medes and their neighbours, although after the Parthian conquest of Media they were probably recruited from Macedonian settlers. The Hetairoi would escort the king into battle or both the Hetairoi and Agema would escort the king under direct command. Amongst these units were the various grades of 'Kings Friends' or Basilikoi Philoi who made up other elite cavalry units similar to the Companions.
Hellenistic cavalry is much more diverse than Greek cavalry of past eras. Greek tactical manuals categorize them as cataphracts (fully armored, a type of cavalry not to be confused with the Seleucid, Parthian or Byzantine cataphracts) and aphracts (unarmored). Cataphracts was a term commonly employed to describe fully armored cavalry of various weights with or without shield (usually a thureos), usually armed with lance. Unarmored cavalry was classified as lancers, javelineers and bowmen. Lancers (xystophoroi or doratophoroi) charged the enemy in dense formations. Javelineers were also called Tarentines and attacked the enemy from afar. Afterwards, they would charge the enemy with lances or keep their distance, in which case they were called light cavalry and/or Tarentines proper. A further category of light cavalry was that of the mounted bowmen, which were collectively called Scythians. These are broad categories, as attested by both Aelian and Asclepiodotus. Arrian's categorization is also very similar.
Most cavalry units of the Hellenistic era were moderately armored and would be armed with javelins or/and lances. Cataphracts were developed by the Seleucids in the late 3rd century BC and are attested to have been used, probably in a lighter version and for a very limited time, also by the kingdom of Pergamon. Antiochus III was able to field an extraordinary 6.000 men in Magnesia, the first testimony of cavalry gaining victory over the closed ordered ranks of a competent infantry, yet to no avail. The Seleucids also had moderate access to horse archers from their eastern borders, although they never fielded them in large numbers. The Ptolemies also deployed heavy armored lancers, never cataphracts, probably because of the high temperatures prevalent in their empire. In Macedonia, armored lancers were also deployed, after the tradition of Alexander's Hetairoi, yet their capability could not compare to this of their predecessors. In the rest of the Greek world, cavalry maintained its traditional equipment of javelin and short lance. Apart from the cavalry types used by the Greeks, the Hellenistic kingdoms also used cavalry from subordinate and allied barbarian states, which varied in quality, armor and equipment. Mercenary cavalry troops were also employed including Thracians, Armenians, and even Berbers.
No cavalry formation is unfortunately mentioned in the existent descriptions of cavalry battles, but all ancient Greek tactical manuals, including Asclepiodotus' Techne Taktike written in the 1st century BC, clearly and in detail describe the wedge and the rhombus formations, stating that they were in use at least at the time of their compilation beside the more common square and rectangular formations. Thus, we have to accept the probability that they were used throughout the Hellenistic era. Other formations attested and probably used were the Tarantenic circle, employed by the Tarentines proper and the Scythian formation, attested in use by the Scythian horse archers. Both were skirmishing formations and facilitated continuous harassment while at the same time providing the required mobility to avoid enemy charges.
Although, throughout the Hellenistic era, more importance was usually given to the role of the infantry than to cavalry, most major battles of the era were gained because of good or bad cavalry performance. Antigonus was defeated at Ipsus, because his victorious cavalry failed to return from the pursuit before the 400 enemy elephants effectively blocked its way back. Antiochus was defeated at Raphia, when, engaging in pursue of the defeated enemy cavalry, he failed to return and charge the enemy phalanx. At Cynoscephalae, the Aetolian cavalry played a key role in the battle and at Pydna, the Macedonian lancers suddenly left the battlefield allowing the Romans to surround and massacre Perseus' phalanx. At Magnesia, the cataphracts routed the Roman legions but it was Eumenes' cavalry that turned the tide and effectively ensured victory for the Romans. In Sellasia, it was Philopoemen's cavalry that conquered Oida, earning the admiration of Antigonus Doson.
A modern conception, there is no mentioning of a "heavy cavalry" in the Greek military manuals. Unfortunately, even today, we don't have a concrete notion of what "heavy cavalry" should be. According to one school of thought, it is any cavalry capable of shock action against the enemy line, according to another, it should just be heavily armored. According to the Greeks, we have to define it as any cavalry which was not considered "light", that is, which was not purely skirmishing. Another aspect of the cavalry of the ancient era we have to keep in mind is the unwillingness to use even the best trained and heaviest of cavalries against any dense mass of able infantry. This is evident in many ancient descriptions of battles. According to Arrian, when Alexander faced the Indian tribe of the Malli, he did not dare assault them with his, by now, veteran Heteroi or Thessalians, but he followed the customary cavalry tactics of attacks and retreats (perispasmoi).
Thus, most cavalry types of the Hellenistic armies can be considered heavy, regardless their armor, as long as they are equipped with lances and act in dense formations. Traditional Greek cavalry was usually employed to cover a retreat or pursue a retreating enemy. Cavalry battle was usually a lengthy exchange of javelins and close combat was avoided. The Macedonian Hetairoi (Companions; Companion Cavalry) may have been the first true, able shock cavalry, armed with long lances and heavy armor. Their tradition was carried on in the Hellenistic times and troops similarly armed were called doratophoroi or xystophoroi (both terms translated as lancebearers or plainly lancers). The term Hetairoi was reserved for cases, in which the unit was comprised by men of aristocratic blood. These doratophoroi were primarily used against enemy cavalry and their use against densely deployed infantry was very limited. Their extreme version were the cataphracts of the Seleucid cavalry. The various Agemata (pl. of Agema), usually the elite bodyguards of the Hellenistic Kings, were similarly armed.
Cataphracts were heavily armed and armoured cavalrymen. The Cataphract (Kataphraktoi) were first introduced into the Hellenistic military tradition with the Seleucid Antiochus III the Greats anabasis in the east from 212-205 BC. With his camapaigns in Parthia and Bactria he came into contact with Cataphracts and copied them. Most of the Seleucid heavy cavalry after this period are armed in this manner, despite keeping their original unit names. The Cataphract was generally relegated to being in the eastern Hellenistic armies solely.
Both man and horse were entirely encased in armour—in the form of scale or banded segments sewn onto a fabric. Riders' faces were covered in seamless metal helmets. The weight carried by the horse was excessive, and prolonged charges were out of the question. Instead, cataphracts trotted to within a reasonable distance before charging, exerting energy only during the decisive engagement. Once in combat, the cataphract and his steed enjoyed superb protection from attacks thanks to their armour. Stamina, endurance and heat were always concerns in extended combat, however.
The standard weapon of the cataphract was a xyston-like spear. For close-quarter combat, a mace or sword was made available as a secondary weapon. The mace and cataphract ideas were combined into the Sassanid-introduced and Roman-named Clibanarii who were armoured, both man and beast, in chainmail, and armed with a mace.
The writings of historians, from Arrian to Appian, detail numerous tribes, nations, and ethnic groups—the Dahae, Mysians, etc.--from whom Hellenistic rulers recruited such warriors.
Originally the cavalry of the army of the Greek city of Tarantas (Tarentum) in Magna Graecia, it was renowned for its peculiar battle tactics. It consisted the only cavalry of the Graeco-Roman world to employ pure, advanced skirmishing tactics. It was unarmored and normally equipped with shield and javelins, which it hurled to the enemy, evading any attempt to engage in close combat. In the Hellenistic era, we have numerous references to Tarantine units, even in the armies of the eastern Macedonian empires, but unfortunately no definite account of their equipment or their tactical use. From the Greek tactical manuals we learn that Tarantines is the collective name of the lightly armored cavalry, which equipped with javelins and lance, first skirmishes against the enemy and then charges. If this cavalry attempts no charge remaining at distance, then it is called Tarantines proper. From these texts we can safely deduce that during the Hellenistic times, the term "Tarantines" bore no geographical significance anymore.[24][25] It was purely used as a tactical term.
War chariots were rarely used during the Hellenistic era. Their value against any opponent or commander of notable skill was very low as was already proven by the Ten Thousand (the Greek mercenaries with whom Xenophon served) at Cunaxa and Alexander in Arbela. Their use is considered more harmful than beneficial in the Greek tactical manuals, yet they could have a frightening effect on badly trained, inexperienced opponents, such as Asiatic tribal armies. This, the idea that the Romans had no previous experience in fighting chariots, might be the reason why Antiochus III used them against the Roman army, with disastrous effects for his own army. Appian suggests that wounding the horses that draw a war chariot can cast the formation in disorder, because an out-of-control chariot forces other chariots to engage in evading maneuvers to avoid being hit by its scythes.[26] Archelaus also used them against Sulla in the battle of Chaeronea, again to no avail.[27]
War elephants were considered untrustworthy by Greek military writers but played an important role in many battles of the Hellenistic era, especially in the east. As was proven many times before, as well as in the wars of Pyrrhus and Hannibal, elephants could throw a competent enemy battle line into confusion and win the day, as long as the enemy was not accustomed to do battle against them. Yet, if used for a frontal assault, the danger of them being routed and falling in panic into the lines of their own army was great. As Liby attested, elephants were more dangerous when scared than when controlled.[28] The Hellenistic generals were well aware of this fact and thus did not deploy them before or among their battle line, as was the case in Hydaspes or in Zama, both examples of how routing elephants could cost the battle. Instead they were deployed on the wings, where they could keep the enemy cavalry at bay, protecting the infantry from a cavalry outflank. Against them, the enemy would use his own elephants, a necessity, since cavalry would never be able to conquer them. There, should they be defeated, they would have space to retreat without getting in the way of the infantry. Elephants would sometimes be accompanied by irregular infantry battalions, which would assist in the elephantomachia (elephant battle), while at the same time protecting their side from enemy infantry.
A peculiar use of the elephants is attested during the battle of Ipsus, where Seleucus Nicator posted his elephants in a long line between the battlefield and the victorious cavalry of Demetrius, effectively keeping him away and gaining victory. This incident might be the best attestation of the unwillingness of horses to approach an elephant.
War elephants were typically fitted with a tower on their back which housed several soldiers armed with sarissae and projectiles (arrows or javelins) to unload on the enemy. The rider (mahout) sat across the neck and guided the elephant into battle. Armour too, was sometimes wrapped around the elephants to protect them and increase their natural defense offered by the thickness of their hides. The size of the tower would be analogous to the size of the elephants, the Asiatic being considerably larger than the now extinct African bush elephant used by the Ptolemies. Polybius gives a valuable account of an elephant battle between these two species in his description of the battle of Raphia, where the beasts of Antiochus easily routed their African counterparts, yet the King failed to claim victory, since Ptolemy's phalanx forced his center to retreat in disorder.[29]
Artillery was also used in the Hellenistic era, albeit rarely and without much effect. Catapults and other heavy artillery had a short range which meant they would have to be up close to the enemy to make an impact. However this made them vulnerable, indeed 'the difficulty of getting catapults quickly into, and out of, action might make them more of a liability than an asset in fluid warfare'.[30] Machanidas of Sparta learnt this the hard way when his artillery at the battle of Mantinea in 207 BC was quickly taken by Philopoemen's Achaean infantry.[31] Philip V of Macedon used artillery, in conjunction with defensive field works, in his defence of the Aous Valley in the Second Macedonian War causing high Roman casualties.[32] Antiochus the Great is attested to have used it in Thermopylae, resting it in imposing positions over the prospected battlefield. Perseus of Macedon in the Third Macedonian War used artillery to defend the Elpeus river from Aemilius Paulus, who did indeed move away to seek another route around this defensive line. It was also used in fortified towns to harass enemy assailants. Its use in the battlefield does not seem to have been important, as mass use is not attested until much later, as Arrian clearly suggests in his "Array against the Alans".
Camels are attested in use in the Seleucid army at the battle of Magnesia, but their small number (500) suggests they were not a regular addition.[33] According to Xenophon,[34] their scent scared off horses, but this effect must not have been especially notable or more such contingent would surely have been in use by the Epigons.
The phalanx would be formed in the center, charging the enemy in pursuit of a swift victory. Its flanks would be protected by battalions of infantry, which ideally would be more trustworthy in case of disorder. Cavalry and elephants would array in the wings to counter those of the enemy. Light infantry would be deployed in front of the phalanx in an effort to throw the enemy line into confusion. Then they would run to the wings to assist in the cavalry and elephant battles.
Of course deviation from the norm exist, when the circumstances called for a different plan. Pyrrhus countered the Roman legions by using a mixed phalanx formation of pikemen, spearmen and elephants, an array that proved successful in all battles against them, regardless his "more than average" losses. A most competent tactician indeed, his decisions were influenced by the composition of his army, which included many untrustworthy troops from Magna Graecia. The battle of Sellasia was also peculiar, in reality being more of an assault against a static enemy, a fact that enabled Antigonus to effectively launch a series of separate attacks.
In the Hellenistic period, development in science was incredibly noteworthy and that could not but reflect on siegecraft. Archimedes developed machines, which terrified the Roman assailants of Syracuse, Demetrius Poliorcetes was notorious for the incredible size of the siege machines employed in his exploits, especially against the city of Rhodes. Yet, most sieges were realized in more traditional ways, relying on speed, surprise and traitors rather than long lasting preparations and exhausting battering. Livius is very descriptive regarding the harassing manner of military campaigns, a complicated game of continuous attacks, moving of forces and constant patrols.
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