
Today, I want to talk fantasy. And epic armies. And economics.
Yes, they connect.
First off, I have no expert knowledge in this subject. I’m neither an economist nor do I have a military background of any sort. But I read a lot of fantasy, and I write a lot of fantasy, and recently, I’d been mulling on the topic of fantasy warfare when I’d realized an army in a book I was reading had no food. Which then spun off to other musings, and things (namely, my suspension of disbelief) started crumbling. While this…discussion…is more aimed at epic and grimdark fantasy, it can also be applied to military science fiction and more battle-oriented space opera (though I’ve noticed that military sci-fi tends to be more realistic about the, uh, monetary cost of war). Anyway. Onward!
If you, dear reader, intend to introduce some warfare on a grand scale into your fantasy world, I would like to remind you of a few things:
Armies are big.
Armies are expensive.
Armies eat a fuck-ton of food.
They also, as a whole, move very, very slowly. Mobilizing an entire army and having it move, say, twenty miles is an undertaking. Namely because of supply trains. Because your big-ass fantasy army (which shall be, from now on, referred to as the BAFA) is really made up of thousands of people, and if those people are marching and burning calories, they’re gonna need to eat to replace all that energy expended, especially if you want them to then fight when they get to wherever they’re going (I’m not even bringing up the issue of clean drinking water).
But it’s not just food. It’s supplies. It’s equipment. It’s (if you have cavalry) all the horses’ tack and their grooms. It’s all those damn tents. The bedrolls. The cookware for preparing all the aforementioned food (unless you’re going to make them all march on hardtack…expect lower moral). Oh, and all the army’s support staff (the blacksmiths, the quartermasters, the cooks, the grooms, the healers/medical personnel, the engineers for the siege equipment, the army administrators—all the logistical supply for the logistical supply). Armies are big. And bulky. And cumbersome. And, when everything is moving in concert with all its various parts, starts to feel insurmountable. When taken as a whole.*
It’s still made up of individuals.
Who also, if they’re doing this as a mode of employment, like to be paid. Where are you getting all the gold necessary to fund this? Honestly, this is usually why my suspension of disbelief starts to waver when the BAFAs come out. If the writer hasn’t built a believable economy, I start to question where the funds are coming from. By the way, you know what’s more expensive than armies? Countries. Good lord, those are giant money-sinks. But back to the armies.
It’s possible they may be unpaid, untrained conscripts. Expect some wholesale slaughter if they’re up against a superior force. Also, expect a lot of desertion. However, a few epic fantasies I’ve read lately have been going the route of religious fanaticism to keep their unpaid, untrained constricts standing in lines. …okay. You can have that once, maybe twice, but seriously, it’s starting to get lazy, imo. And they never seem to fall apart quite as frequently nor in the same way as they do in history…
So. Either you are paying your army or your conscripting them. There’s also a third option: pillage-as-pay (or raiding).
Now, if you’re going to go down the pillage-as-pay route, there’s one inherent flaw: if there’s no pillaging, there’s no pay. If the food, supplies, and money for your army is going to come from the people you’re invading, all the invadees have to do is set fire to their fields and starve you out. You’ll likely run out of supplies long before they run out of country to flee over. Aaaaaand then you have issues of low moral.
(Seriously. It’s like a giant game of Oregon Trail here.)
Let’s say you don’t want to invade. Instead, you’re on the defending side, fighting back the invasion with a standing army. That still costs. They still need housing. They still need to eat. Else you’re going to get the low moral problem.
Low moral, by the way, means people start to resent you. And people who resent you are difficult to convince to go fight and die on your behalf.**
Now, stepping sideways into a specific example, and something that’s been lately bugging me.

Cavalry.
Fantasy writers, please stop misusing cavalry. I know, I know, it looks dramatic in the mind’s eye to line your cavalry up with all their shining armor and lances, and have them suicide-charge against the enemy’s cavalry. Cue flashing weapons, crunching armor, horse squeals, and sprays of blood.
Remember what I was saying about armies being expensive? Cavalry is really expensive. Not only do you have to train your soldier to ride and fight from horseback, you need to train the horse…and horses are not cheap. So you’ve got food, housing, animal care, training plus room and board, training, and arming/outfitting for the human (oh, and pay), and this is just one cavalry-person. Fantasy likes to have cavalry numbering in the hundreds upon hundreds, and every one of them costs.
Are you seriously going to throw your cavalry into certain death? Or are you going to keep them in reserve and, if desperate, dismount your cavalry and have them fight on foot? Save the horse for when you actually need a horse—say, for when you need forces to go from point A to point B quickly, or when you need speed for engaging/disengaging, such as having them to flank and harry the sides of a force.
And while we’re on the topic of cavalry, what about anti-cavalry? Where are the damn pikes? The spears? The pointy-things partially made for downing horses? And what about anti anti-cavalry? I don’t quite remember who said it, but I know it was at a GenCon panel a few years ago, but someone pointed out that those big heavy claymores? Those are for lopping the ends off of pikes so they don’t impale your cavalry. Now, I recognize this needs citation to be accurate, but if it is, where are the claymores?
Warfare seems, at least to my eyes, to be weapons and counter-weapons (and armor, and tactics). There should be depth to war strategy (honestly, this is why I usually avoid writing from the viewpoints of generals; it can be hard to grasp the stakes when we’re talking about thousands and thousands of people being moved this way and that on a map).
Though it’s a common thing to poke at in fantasy, I will also reiterate that horses aren’t machines. There’s a few wonderful series of articles about horses and fantasy on Tor.com, and I highly recommend taking a gander.
Also, a bit older, but this article on Fantasy-Faction about building fantasy armies might be worth a look while you’re at it.
* We’re talking whole armies here, not skirmishes/raiding parties. Smaller groups can get away with less support.
**While, yes, if we’re talking fantasy, there could be other ways to compel an army to fight, such as through magical means. However, this can lead to the army becoming just a homogenized lump of faceless humanity and little more than a prop to introduce conflict into the narrative.
If anyone knows who did the other three images, I’d love to be able to properly attribute them.