The hoplite phalanx was the common fighting style of essentially all Greek poleis. It was not unique to Sparta.

That comes with all sorts of implications. The Spartans used the same military equipment as all of the other Greeks: a thrusting spear (the dory), a backup sword (a xiphos or kopis; pop-culture tends to give Spartans the kopis because it looks cool, but there is no reason to suppose they preferred it), body armor (either textile or a bronze breastplate), one of an array of common Greek helmet styles, and possibly greaves. We might expect the Spartiates – being essentially very wealthy Greeks – to have equipment on the high end of the quality scale, but the Perioikoi, and other underclasses who fought with (and generally outnumbered) the Spartiates will have made up the normal contingent of “poor hoplites” probably common for any polis army.

Xenophon somewhat oddly stops to note that the Spartiates were to carry a bronze shield (kalken aspida; Xen. Lac. 11.3 – this is sometimes translated as “brass” – it is the same word in Greek – but all Greek shield covers I know of are bronze). This is not the entire shield, as in [the movie] 300 – that would be far too heavy – but merely a thin (c. 0.25mm) facing on the shield. It’s odd that Xenophon feels the need to tell us this, because this was standard for Greek shields. Perhaps poorer hoplites couldn’t afford the bronze facing and used a cheaper material (very thin leather, essentially parchment, is common in many other shield traditions) and Xenophon is merely noting that all of the Spartiates were wealthy enough to afford the fancy and expensive sort of shield (it has also been supposed that elements of this passage have dropped out and it would have originally included a complete panoply, in which case Xenophon is just uncharacteristically belaboring the obvious).

The basics of the formation – spacing, depth and so on – also seem to have been essentially the same. The standard depth for a hoplite phalanx seems to have been eight (-ish; there’s a lot of variation). The Spartans seem to have followed similar divisions with a fairly wide range of depths, perhaps trending towards thinner lines in the fourth century than in the fifth, though certainty here is difficult. The drop in depth may be a consequence of manpower depletion, but it may also indicate a greater faith held by Spartan commanders of their line’s ability to hold. Depth in a formation is often about morale – the deeper formation feels safer, which improves cohesion.

It’s hard to say if the Spartan phalanx was more cohesive. It might have been, at least for the Spartiates. The lifestyle of the Spartiates likely created close bonds which might have aided in holding together in the stress of combat – but then, this was true of essentially every Greek polis to one degree or another. The best I can say on this point is that the Spartan battle record – discussed at length below – argues against any large advantage in cohesion.

That said, the Spartan battle order does seem to have been notably different in two respects:

First: it had a much higher ratio of officers to regular soldiers. This was clearly unusual and more than one ancient source remarks on the fact (Thuc. 5.68; Xen. Lac. 11.4-5, describing what may be slightly different command systems). Each file was under the command of the man in front of it (Xen. Lac. 11.5). Six files made an enomotia (commanded by an enomotarchos); two of these put together were commanded by a pentekonter (lit: commander of fifty, although he actually had 72 men under his command); two of those form a lochos (commanded by a lochagos) and four lochoi made a mora, commanded by a polemarchos (lit: war-leader) – there were six of these in Xenophon’s time. Compared to most Greek armies of the time, that’s a lot of officers, which leads to:

Second: it seems to have been able to maneuver somewhat more readily than a normal phalanx. This follows from the first. Smaller tactical subdivisions with more command personnel made the formation more agile. Xenophon clearly presents this ability as exceptional, and it does seem to have been (Xen. Lac. 11.4). Hoplite armies victorious on one flank often had real trouble reorganizing those victorious troops and wheeling them to flank and roll up the rest of the line (e.g. the Athenians at Delium, Thuc. 4.96.3-4). The Spartans were rather better at this (e.g. at Mantinea, Thuc. 5.73.1-4). They also seem to have been better at marching and moving in time.

Now, I do not want to over-sell this point. We’re comparing the Spartans to other hoplite forces which – in the fifth century especially – were essentially dumbfire missiles. The general (or generals) point the phalanx at the enemy, hit “go” and then hope for the best. Really effective command – what Everett Wheeler refers to as the general as “battle manager” – really emerges in the fourth century, mostly after Spartan power was already broken (E. Wheeler, “The General as Hoplite” in Armies of Classical Greece, ed. Wheeler (2007)). While “right wing, left wheel” is hardly the most complicated of maneuvers (especially given that the predictable rightward drift of hoplite armies in battle meant that it could be planned for), compared to the limitations of most hoplite forces, it marked the Spartans out as unusually adept.

More complicated Spartan maneuvers often went badly. Spartan forces at Plataea (479 – Hdt. 9.53) failed to effectively redeploy under orders, precipitating an unintended engagement. Plugging a gap in the line once the advance was already underway, but before battle was joined (something Roman armies did routinely) was also apparently beyond the capabilities of a Spartan army (Thuc. 5.72). While the Spartans are often shown in popular culture with innovative tactical formations – like the anti-cavalry wedge or anti-missile shield-ball (both of which, to be clear, are nonsense) formations in 300 – in practice the Spartan army was tactically uncreative. Like every other hoplite army, the Spartans formed a big rectangle of men and smashed it into the front of the enemy’s big rectangle of men. Notably, as we’ll see, the Spartans made limited and quite poor use of other arms, like light infantry or cavalry, even compared to other Greek poleis (and the bar here is very low, Greek combined arms, compared to say, Roman or Macedonian or Persian combined arms, was dismal). If anything, the Spartans were less adaptable than other hoplites.

Bret Devereaux, “Collections: This. Isn’t. Sparta. Part VI: Spartan Battle”, A Collection of Unmitigated Pedantry, 2019-09-20.