Tag: books

An Unmitigated Pedant defends the military elements of The Lord of the Rings. I read this with particular interest, because the military scenes and battles have tended to be the one area where Arts of Dark and Light have been said to actually exceed the master’s masterpiece. His core thesis is that it is primarily Peter Jackson who is to blame for the perception that Tolkien’s military setups and strategies were suboptimal, although he blames most of Jackson’s shortcomings on the medium in which he was working.

I’m not so sure about that, given Faramir’s cavalry charge against a fortified position being held by missile-armed forces. But never mind that for now.

The army Sauron sends against Minas Tirith is absolutely vast – an army so vast that it cannot fit its entire force in the available frontage, so the army ends up stacking up in front of the city:

The books are vague on the total size of the orcish host (but we’ll come back to this), but interview material for the movies suggests that Peter Jackson’s CGI team assumed around 200,000 orcs. This army has to exit Minas Morgul – apparently as a single group – and then follow the road to the crossing at Osgiliath. Is this operational plan reasonable, from a transit perspective?

In a word: no. It’s not hard to run the math as to why. Looking at the image at the head of the previous section, we can see that the road the orcs are on allows them to march five abreast, meaning there are 40,000 such rows (plus additional space for trolls, etc). Giving each orc four feet of space on the march (a fairly conservative figure), that would mean the army alone stretches 30 miles down a single road. At that length, the tail end of the army would not even be able to leave camp before the front of the army had finished marching for the day. For comparison, an army doing a ‘forced march’ (marching at rapid speed under limited load – and often taking heat or fatigue casualties to do it) might manage 20 to 30 miles per day. Infantry on foot is more likely to average around 10 miles per day on decent roads.

Ideally, the solution to this problem is to split the army up. By moving in multiple columns and converging on the battlespace, you split one impossibly long column of troops into several more manageable ones. There is a danger here – the enemy might try to overwhelm each smaller army in turn – but Faramir has had to pull his troops back out of Ithilien, so there is little risk of defeat in detail for the Army of Mordor. The larger problem is terrain – we’ve seen Ithilien in this film and the previous one: it is heavily forested, with few roads. What roads exist are overgrown and difficult to use. Worse yet, the primary route through the area is not an east-west road, but the North-South route up from Near Harad to the Black Gate. The infrastructure here to split the army effectively simply doesn’t exist.

A map from regular Earth, rather than Middle Earth. This is Napoleon’s Ulm Campaign (1805) – note how Napoleon’s armies (the blue lines) are so large they have to move in multiple columns, which converge on the Austrian army (the red box labeled “FERDINAND”). This coordinated movement is the heart of operations: how do you get your entire army all to the battlefield intact and at the same time?
This actually understates the problem, because the army of Morder also needs supplies in order to conduct the siege. Orcs seem to be able to make do with very poor water supplies (Frodo and Sam comment on the foulness of Mordor water), so we can assume they use local water along the march, but that still leaves food. Ithilien (the territory they are marching through), as we have seen in the film, is unpopulated – the army can expect no fresh supplies here (or in the Pelennor beyond, for reasons we’ll discuss shortly). That is going to mean a baggage train to carry additional supplies, as well as materials for the construction of all of the fancy siege equipment (we, in fact, later see them bringing the towers pre-built – we’ll get to it). This would lengthen the army train even more.

All of that raises a second point – from a supply perspective, can this operation work? Here, the answer is, perhaps surprisingly, yes. Minas Morgul is 20 leagues (around 60 miles) from Minas Tirith. An infantryman might carry around (very roughly) 10 days or so of rations on his person, which is enough to move around 120 miles (these figures derive from K. Chase, Firearms: A Global History to 1700 (2003) – well worth a read! – but are broadly applicable to almost any army before the invention of the railroad). The army is bound to be held up a bit along the way, so the Witch King would want to bring some wagons with additional supplies, but as a matter of supply, this works. The problem is transit.

As a side note, the supply issue neatly explains the aggressive tactics the Witch king employs when he arrives at Minas Tirith, moving immediately for an assault rather than a siege. Because the pack animals which pull wagons full of food eat food themselves, there is literally no amount of wagons which would enable an army of this size to sustain itself indefinitely in a long siege. The Witch King is thus constrained by his operational plan: the raw size of his army means he must either take the city in an assault quickly enough to march most of his army back, or fail. He proceeds with the appropriate sense of urgency.

That said, the distances here are short: 60 miles is a believable distance for an army to make an unsupported ‘lunge’ out of its logistics network. One cannot help but notice the Stark (hah!) contrast with the multi-hundred-mile supply-free lunges in the TV version of Game of Thrones, which are far less plausible.

Great, now I have to re-read The Lord of the Rings from a strategic and logistics perspective. Hmmm, this might actually make for an interesting Darkstream series. Would that be of interest to anyone else or is this just another AI music sort of thing?

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