I should note here at the outset that we’re not going to be quite done with the system here – when we start looking at the third and second century battle record, we’re going to come back to the system to look at some innovations we see in that period (particularly the deployment of an enallax or “articulated” phalanx). But we should see the normal function of the components first.

No battle is a perfect “model” battle, but the Battle of Raphia (217BC) is handy for this because we have the two most powerful Hellenistic states (the Ptolemies and Seleucids) both bringing their A-game with very large field armies and deploying in a fairly standard pattern. That said, there are some quirks to note immediately: Raphia is our only really good order of battle of the Ptolemies, but as our sources note there is an oddity here, specifically the mass deployment of Egyptians in the phalanx. As I noted last time, there had always been some ethnic Egyptians (legal “Persians”) in the phalanx, but the scale here is new. In addition, as we’ll see, the position of Ptolemy IV himself is odd, on the left wing matched directly against Antiochus III, rather than on his own right wing as would have been normal. But this is mostly a fairly normal setup and Polybius gives us a passably good description (better for Ptolemy than Antiochus, much like the battle itself).

We can start with the Seleucid Army and the tactical intent of the layout is immediately understandable. Antiochus III is modestly outnumbered – he is, after all, operating far from home at the southern end of the Levant (Raphia is modern-day Rafah at the southern end of Gaza), and so is more limited in the force he can bring. His best bet is to make his cavalry and elephant superiority count and that means a victory on one of the wings – the right wing being the standard choice. So Antiochus stacks up a 4,000 heavy cavalry hammer on his flank behind 60 elephants – Polybius doesn’t break down which cavalry, but we can assume that the 2,000 with Antiochus on the extreme right flank are probably the cavalry agema and the Companions, deployed around the king, supported by another 2,000 probably Macedonian heavy cavalry. He then uses his Greek mercenary infantry (probably thureophoroi or perhaps some are thorakitai) to connect that force to the phalanx, supported by his best light skirmish infantry: Cretans and a mix of tough hill folks from Cilicia and Caramania (S. Central Iran) and the Dahae (a steppe people from around the Caspian Sea).

His left wing, in turn, seems to be much lighter and mostly Iranian in character apart from the large detachment of Arab auxiliaries, with 2,000 more cavalry (perhaps lighter Persian-style cavalry?) holding the flank. This is a clearly weaker force, intended to stall on its wing while Antiochus wins to the battle on the right. And of course in the middle [is] the Seleucid phalanx, which was quite capable, but here is badly outnumbered both because of how full-out Ptolemy IV has gone in recruiting for his “Macedonian” phalanx and also because of the massive infusion of Egyptians.

But note the theory of victory Antiochus III has: he is going to initiate the battle on his right, while not advancing his left at all (so as to give them an easier time stalling), and hope to win decisively on the right before his left comes under strain. This is, at most, a modest alteration of Alexander-Battle.

Meanwhile, Ptolemy IV seems to have anticipated exactly this plan and is trying to counter it. He’s stacked his left rather than his right with his best troops, including his elite infantry (the agema and peltasts, who, while lighter, are more elite) and his best cavalry, supported by his best (and only) light infantry, the Cretans.¹ Interestingly, Polybius notes that Echecrates, Ptolemy’s right-wing commander waits to see the outcome of the fight on the far side of the army (Polyb. 6.85.1) which I find odd and suggests to me Ptolemy still carried some hope of actually winning on the left (which was not to be). In any case, Echecrates, realizing that sure isn’t happening, assaults the Seleucid left.

I think the theory of victory for Ptolemy is somewhat unconventional: hold back Antiochus’ decisive initial cavalry attack and then win by dint of having more and heavier infantry. Indeed, once things on the Ptolemaic right wing go bad, Ptolemy moves to the center and pushes his phalanx forward to salvage the battle, and doing that in the chaos of battle suggests to me he always thought that the matter might be decided that way.

In the event, for those unfamiliar with the battle: Antiochus III’s right wing crumples the Ptolemaic left wing, but then begins pursuing them off of the battlefield (a mistake he will repeat at Magnesia in 190). On the other side, the Gauls and Thracians occupy the front face of the Seleucid force while the Greek and Mercenary cavalry get around the side of the Seleucid cavalry there and then the Seleucid left begins rolling up, with the Greek mercenary infantry hitting the Arab and Persian formations and beating them back. Finally, Ptolemy, having escaped the catastrophe on his left wing, shows up in the center and drives his phalanx forward, where it wins for what seem like obvious reasons against an isolated Seleucid phalanx it outnumbers almost 2-to-1.

But there are a few structural features I want to note here. First, flanking this army is really hard. On the one hand, these armies are massive and so simply getting around the side of them is going to be difficult (if they’re not anchored on rivers, mountains or other barriers, as they often are). Unlike a Total War game, the edge of the army isn’t a short 15-second gallop from the center, but likely to be something like a mile (or more!) away. Moreover, you have a lot of troops covering the flanks of the main phalanx. That results, in this case, in a situation where despite both wings having decisive actions, the two phalanxes seem to be largely intact when they finally meet (note that it isn’t necessarily that they’re slow; they seem to have been kept on “stand by” until Ptolemy shows up in the center and orders a charge). If your plan is to flank this army, you need to pick a flank and stack a ton of extra combat power there, and then find a way to hold the center long enough for it to matter.

Second, this army is actually quite resistive to Alexander-Battle: if you tried to run the Issus or Gaugamela playbook on one of these armies, you’d probably lose. Sure, placing Alexander’s Companion Cavalry between the Ptolemaic thureophoroi and Gallic mercenaries (about where he’d normally go) would have him slam into the Persian and Medean light infantry and probably break through. But that would be happening at the same time as Antiochus’ massive 4,000-horse, 60-elephant hammer demolished Ptolemaic-Alexander’s left flank and moments before the 2,000 cavalry left-wing struck Alexander himself in his flank as he advanced. The Ptolemaic army is actually an even worse problem, because its infantry wings are heavier, making that key initial cavalry breakthrough harder to achieve. Those chunky heavy-cavalry wings ensure that an effort to break through at the juncture of the center and the wing is foolhardy precisely because it leaves the breakthrough force with heavy cavalry to one side and heavy infantry to the other.

I know this is going to cause howls of pain and confusion, but I do not think Alexander could have reliably beaten either army deployed at Raphia; with a bit of luck, perhaps, but on the regular? No. Not only because he’d be badly outnumbered (Alexander’s army at Gaugamela is only 40,000 infantry and 7,000 cavalry) but because these armies were adapted to precisely the sort of army he’d have and the tactics he’d use. Even without the elephants (and elephants gave Alexander a hell of a time at the Hydaspes), these armies can match Alexander’s heavy infantry core punch-for-punch while having enough force to smash at least one of his flanks, probably quite quickly. Note that the Seleucid Army – the smaller one at Raphia – has almost exactly as much heavy infantry at Raphia as Alexander at Gaugamela (30,000 to 31,000), and close to as much cavalry (6,000 to 7,000), but of course also has a hundred and two elephants, another 5,000 more “medium” infantry and massive superiority in light infantry (27,000 to 9,000). Darius III may have had no good answer to the Macedonian phalanx, but Antiochus III has a Macedonian phalanx and then essentially an entire second Persian-style army besides (and his army at Magnesia is actually more powerful than his army at Raphia).

This is not a degraded form of Alexander’s army, but a pretty fearsome creature of its own, which supplements an Alexander-style core with larger amounts of light and medium troops (and elephants), without sacrificing much, if any, in terms of heavy infantry and cavalry. The tactics are modest adjustments to Alexander-Battle which adapt the military system for symmetrical engagements against peer armies. The Hellenistic Army is a hard nut to crack, which is why the kingdoms that used them were so successful during the third century, to the point that, until the Romans show up, just about the only thing which could beat a Hellenistic army was another Hellenistic army.

Bret Devereaux, “Collections: Phalanx’s Twilight, Legion’s Triumph, Part Ib: Subjects of the Successors”, A Collection of Unmitigated Pedantry, 2024-01-26.

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1. You can tell how much those Cretans are valued, given that they get placed in key positions in both armies.