There only two parts of this narrative unambiguously suggested by our sources are equipment changes: that Marius introduced a new type of pilum (Plut. Mar. 25) and that he standardized legionary standards around the aquila, the eagle standard (Plin. NH 10.16).

For the pilum, Plutarch says that Marius designed it to incorporate a wooden rivet where the long metal shank met the heavy wooden shaft, replacing one of the two iron nails with a wooden rivet that would break on impact, in order to better disable the shield. The problem is that the pilum is actually archaeologically one of the best attested Roman weapons with the result that we can follow its development fairly closely. And the late, great Peter Connolly did exactly that in a series of articles in the Journal of Roman Military Equipment Studies¹ and while the design of the pilum does develop over time, there’s simply no evidence for what Plutarch describes. The “broad tanged” pilum type could have been modified this way, but we’ve never found one actually so modified; instead the pila of this type we find all have rivets (two of them) in place (where rivets are preserved at all). Moreoever, most pila of that “broad tanged” type, both before and after Marius, have the edges of that broad tang bent over at the sides, which would prevent the sort of sliding action Plutarch describes even if one of the rivets broke. Meanwhile, by the first century there are three types of pila around (socketed, broad-tanged and spike-tanged) only one of which could be modified in this way (the broad-tanged type), and that type doesn’t dominate during the first century when one might expect Marius’ new-style pila to be in use. In practice then the conclusion seems to be that Plutarch made up or misunderstood this “innovation” in the pilum or, at best, the design was adopted briefly and then abandoned.

On to the aquila. Now, it is absolutely true that the aquila, the legionary eagle, became a key standard for the Roman legions. Pliny the Elder notes that before Marius it was merely the foremost of five standards, the others being the wolf, minotaur, horse and boar (Plin. HN 10.16). But even a brief glance as legionary standards into the early empire (see Keppie (1984), 205-213 for an incomplete and somewhat dated list) shows that bulls, boars and wolves remained pretty common legionary emblems (alongside the eagle) into the empire. The eagle seems to have been something of a personal totem for Marius (e.g. Plut. Mar. 36.5-6) so it is hardly surprising he’d have emphasized it, the same way that legions founded by Caesar – or which wanted to be seen as founded by Caesar – adopted the bull emblem, quite a lot. But this is a weak accomplishment, since Pliny already notes that the eagle was, even before Marius, already prima cum quattuor aliis (“first among four others”), and so it remained: first among a range of other emblems and standards. Though of all of the things we may credit Marius with instituting, this perhaps gets the closest, if we believe Pliny that Marius further elevated the eagle into its particular position.

Then there is the institution of the Roman marching pack and the furca to carry it, such that Marius’ soldiers became known as “Marius’ mules” because he made them carry all of their own kit rather than, as previous legions had supposedly done, carrying it all on mules. Surely this extremely famous element of the narrative cannot be flawed? And Plutarch sort of says this, he notes that, “Setting out on the expedition, he laboured to perfect his army as it went along, practicing the men in all kinds of running and in long marches, and compelling them to carry their own baggage and to prepare their own food. Hence, in after times, men who were fond of toil and did whatever was enjoined upon them contentedly and without a murmur, were called Marian mules” (Plut. 13.1; trans. B. Perrin). Except that doesn’t say anything about instituting the classic Roman pack that we see, for instance, depicted on Trajan’s column, does it? It just says Marius made his men carry their baggage and prepare their own food, leading to the nickname for men who did toil without complaint.

The problem is that those two things – making soldiers carry their baggage and cook their own food (along with kicking out camp followers) – are ubiquitous commonplaces of good generalship with instances that pre-date Marius. P. Cornelius Scipio Aemilianus does exactly this – getting rid of camp servants, wagons and pack animals, making soldiers cook their own food and kicking out the camp followers – according to Appian in 134 when he besieged Numantia (which fell in 133, App. Hisp. 85). And then Q. Caecilius Metellus, Marius’ own former commander, does the exact same thing in 109 when he takes command against Jugurtha in North Africa, kicking the sutlers out of the camp, getting rid of pack animals and private servants, making soldiers cook their own food, carry their own rations and their own weapons (Sall. Iug. 42.2; note that Sallust dies in in the 30s BC, 80-odd years before Plutarch is born, so Plutarch may well be getting this trope from Sallust and then attributing it to the wrong Roman). Critiques of generals who issued rations rather than making their soldiers cook or praise for generals who didn’t remained standard into the empire (e.g. Tac. Hist. 2.88; Hdn. 4.7.4-6; Dio Cass. 62.5.5). In short this trope was not new to Marius nor was it new to Plutarch’s version of Marius; it was a standard trope of generals restoring good discipline to their soldiers. Plutarch even hedges noting another story that the term “Marius’ mules” might actually have come how well Marius as a junior officer got along with animals (Plut. Mar. 13.2)!

Well, fine enough, but what about the idea that state-issued equipment is emerging in this period? Well, it might be but our evidence is not great. As noted when we discussed the dilectus, Polybius implies – and his schematic for conscription makes little sense otherwise – that the Romans are in that period buying their own equipment. He also notes that the quaestors deduct from a soldier’s pay the price of their rations (if they are Romans; socii eat for free), their clothing and any additional equipment they need (Polyb. 6.39.14). It makes sense; if a fellow forgot a sword or his breaks, you need to get that replaced, so you fine him the value of it and then issue him one from the common store.

Now Keppie (1984) assumes this system changes during the tribunate(s) of Gaius Gracchus (123-2) and you can see the temptation in this idea. If Gaius Gracchus shifts equipment to being issued at state expense, then suddenly there’s no reason not to recruit the landless proletarii (discussed below) opening the door for Marius to do so (discussed below) and fundamentally transforming the Roman army into the longer-service, professional form we see in the empire. The problem is that, well, it didn’t happen. First, we have no evidence at all that Gaius Gracchus did anything related to soldier’s arms and armor; what we have is a single line from Plutarch that soldiers should be issued clothing at state expense with nothing deducted from their pay to meet this cost (Plut. C. Gracch. 5.1). The assumption here is that this also covered arms and armor, but Plutarch doesn’t say that at all. The more fatal flaw is that we can be very, extremely sure this reform didn’t stick, because we have a bunch of Roman “pay stubs” from the imperial period (from Egypt, naturally) and regular deductions vestimentis, “for clothing” show up as standard.² Indeed, they show up alongside deductions for food and replacement socks, boots and so on, exactly as Polybius would have us expect. Apart from the fact that this is presumably being done by a procurator instead of a quaestor (a change in the structure of administration in the provinces run directly by the emperor), this is the same system.

Now there are reasons to think that at least some equipment was state supplied or contracted (even if it may have been billed to the accounts of the soldiers who got it). Scipio creates a public armaments production center in Carthago Nova in 210, but this may be a one off. Seemingly more centralized production of arms under contract are more common in the late Republic and by the imperial period we start to see evidence of fabricae which seem to be central production sites for military equipment.³ But we have no hint in the sources of any sudden reform to this system. It may well be a gradual change as the “mix” of personal and state-ordered equipment slowly tilts in favor of the latter; the system Polybius describes could accommodate both situations, so there’s no need for a sudden big shift. Alternately, the preponderance of state-produced equipment might well be connected to the formalization of a long-service professional army under Augustus. Even then, we still find pieces of equipment in Roman imperial sites which were clearly personal; soldiers could still go and get a fancy version of standard kit, stamp their name in it and call it theirs. All I think we can say with any degree of confidence is that self-purchased equipment seems to be the norm in Polybius’ day whereas state-issued equipment seems to be the norm by the end of the first century. But Marius has nothing to do with it, as far as we can tell and no ancient source claims that he did.

Oh and by the by, if you are picking up from all of this (and our discussion of Lycurgus) that Plutarch is a difficult source that needs to be treated with a lot of caution because he never lets the facts get in the way of a good story … well, that’s true.

Bret Devereaux, “Collections: The Marian Reforms Weren’t a Thing”, A Collection of Unmitigated Pedantry, 2023-06-30.

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1. “Pilum, Gladius and Pugio in the Late Republic”, JRMES 5 (1997), then “The Reconstruction and Use of Roman Weaponry in the Second Century BC”, JRMES 11 (2000) and then “The pilum from Marius to Nero – a reconsideration of its development and function”, JRMES 12/13 (2001/2).

2. On this, see R.O. Fink, Roman Military Records on Papyrus (1971).

3. On all this, see Bishop and Coulston, Roman Military Equipment (2006), 233-240.