From trunk to tail, elephants are a logistics nightmare.

And that begins almost literally at birth. For areas where elephants are native, nature (combined, typically, with the local human terrain) create a local “supply”. In India this meant the elephant forests of North/North-Eastern India; the range of the North African elephant (Loxodonta africana pharaohensis, the most likely source of Ptolemaic and Carthaginian war elephants) is not known. Thus for many elephant-wielding powers, trade was going to always be a key source for the animals – either trade with far away kingdoms (the Seleucids traded with the Mauyran Indian kingdom for their superior Asian elephants) or with thinly ruled peripheral peoples who lived in the forests the elephants were native to.

(We’re about to get into some of the specifics of elephant biology. If you are curious on this topic, I am relying heavily on R. Sukumar, The Asian Elephant: Ecology and Management (1989). I’ve found that information on Asian elephants (Elephas maximus) much easier to come by than information on African elephants (Loxodonta africana and Loxodonta cyclotis).)

In that light, creating a breeding program – as was done with horses – seems like a great idea. Except there is one major problem: a horse requires about four years to reach maturity, a mare gestates a foal in eleven months and can go into heat almost immediately thereafter. By contrast, elephants reach adulthood after seventeen years, take 18-22 months to gestate and female elephants do not typically mate until their calf is weaned, four to five years after its birth. A ruler looking to build a stable of cavalry horses thus may start small and grow rapidly; a ruler looking to build a corps of war elephants is looking at a very slow process. This is compounded by the fact that elephants are notoriously difficult to breed in captivity. There is some speculation that the Seleucids nonetheless attempted this at Apamea, where they based their elephants – in any event, they seem to have remained dependent on imported Indian elephants to maintain the elephant corps. If a self-sustaining elephant breeding program for war elephants was ever created, we do not know about it.

To make matters worse, elephants require massive amounts of food and water. In video-games, this is often represented through a high elephant “upkeep” cost – but this often falls well short of the reality of keeping these animals for war. Let’s take Total War: Rome II as an example: a unit of Roman (auxiliary) African elephants (12 animals), costs 180 upkeep, compared to 90 to 110 upkeep for 80 horses of auxiliary cavalry (there are quite a few types) – so one elephant (with a mahout) costs 15 upkeep against around 1.25 for a horse and rider (a 12:1 ratio). Paradox’s Imperator does something similar, with a single unit of war elephants requiring 1.08 upkeep, compared to just 0.32 for light cavalry; along with this, elephants have a heavy “supply weight” – twice that of an equivalent number of cavalry (so something like a 2:1 or 3:1 ratio of cost).

Believe it or not, this understates just how hungry – and expensive – elephants are. The standard barley ration for a Roman horse was 7kg of barley per day (7 Attic medimnoi per month; Plb. 6.39.12); this would be supplemented by grazing. Estimates for the food requirements of elephants vary widely (in part, it is hard to measure the dietary needs of grazing animals), but elephants require in excess of 1.5% of their body-weight in food per day. Estimates for the dietary requirements of the Asian elephant can range from 135 to 300kg per day in a mix of grazing and fodder – and remember, the preference in war elephants is for large, mature adult males, meaning that most war elephants will be towards the top of this range. Accounting for some grazing (probably significantly less than half of dietary needs) a large adult male elephant is thus likely to need something like 15 to 30 times the food to sustain itself as a stable-fed horse.

In peacetime, these elephants have to be fed and maintained, but on campaign the difficulty of supplying these elephants on the march is layered on top of that. We’ve discussed elsewhere the difficulty in supplying an army with food, but large groups of elephants magnify this problem immensely. The 54 elephants the Seleucids brought to Magnesia might have consumed as much food as 1,000 cavalrymen (that’s a rider, a horse and a servant to tend that horse and its rider).

But that still understates the cost intensity of elephants. Bringing a horse to battle in the ancient world required the horse, a rider and typically a servant (this is neatly implied by the more generous rations to cavalrymen, who would be expected to have a servant to be the horse’s groom, unlike the poorer infantry, see Plb. above). But getting a war elephant to battle was a team effort. Trautmann (2015) notes that elephant stables required riders, drivers, guards, trainers, cooks, feeders, guards, attendants, doctors and specialist foot-chainers (along with specialist hunters to capture the elephants in the first place!). Many of these men were highly trained specialists and thus had to be quite well paid.

Now – and this is important – pre-modern states are not building their militaries from the ground up. What they have is a package of legacy systems. In Rome’s case, the defeat of Carthage in the Second Punic War resulted in Rome having North African allies who already had elephants. Rome could accept those elephant allied troops, or say “no” and probably get nothing to replace them. In that case – if the choice is between “elephants or nothing” – then you take the elephants. What is telling is that – as Rome was able to exert more control over how these regions were exploited – the elephants vanished, presumably as the Romans dismantled or neglected the systems for capturing and training them (which they now controlled directly).

That resolves part of our puzzle: why did the Romans use elephants in the second and early first centuries B.C.? Because they had allies whose own military systems involved elephants. But that leaves the second part of the puzzle – Rome doesn’t simply fail to build an elephant program. Rome absorbs an elephant program and then lets it die. Why?

For states with scarce resources – and all states have scarce resources – using elephants meant not directing those resources (food, money, personnel, time and administrative capacity) for something else. If the elephant had no other value (we’ll look at one other use next week), then developing elephants becomes a simple, if difficult, calculation: are the elephants more likely to win the battle for me than the equivalent resources spent on something else, like cavalry. As we’ve seen above, that boils down to comparisons between having just dozens of elephants or potentially hundreds or thousands of cavalry.

The Romans obviously made the bet that investing in cavalry or infantry was a better use of time, money and resources than investing in elephants, because they thought elephants were unlikely to win battles. Given Rome’s subsequent spectacular battlefield success, it is hard to avoid the conclusion they were right, at least in the Mediterranean context.

Bret Devereaux, “Collections: War Elephants, Part II: Elephants against Wolves”, A Collection of Unmitigated Pedantry, 2019-08-02.