Well, getting started ate quite a few hours, but at least we’re going to move at a constant speed all day right? Of course not. These are humans – they need to eat (lunch), drink and relieve themselves. Men will fall out of line because they are sick or because they sprained an ankle or because they’re tired of marching and faking it (many army guidelines put the medics at the back of the marching column for this purpose). To add to this, wagons get stuck in the mud, mules and horses get stubborn or lame (that chance may seem low, but remember we’re dealing with thousands of animals – small percentages add up fast when you have a few thousand of something).
For reference on how much time this can eat up, 1950s US Army marching regulations (this is again FM21-18 “Foot Marches”) suggest that “battle groups or smaller” (800 men or less, generally – so small, fast-moving infantry) can “under favorable conditions” (read: good, modern paved roads in good weather) make 15-20 miles in a continuous eight hour march. A forced march – marching longer than 8 hours and at a higher than normal pace – can cover more ground (c. 35 miles in a day in some cases) but such a pace will wear out an infantry force fast.
At the end of the day, the army needs to arrive at its planned camp site [early] enough to make camp. Cooking needs to be done. Food that was foraged by flanking units needs to get to the camp, be recorded and stored (or processed and eaten) – speaking of which, note that we haven’t even discussed flankers, scouts and foraging parties. Wages may need to be paid, paperwork needs to be done. In many armies, the camp will need to be fortified – the Romans built a wood-palisade fortified camp every night on the march. And then everyone goes to sleep around 9pm. And that, to be clear, is when everything works like clockwork – which it never does.
For a large army, the breaking camp, waiting to begin marching, waiting for the last man to arrive, dealing with pack animals and wagons slices a few hours off of that eight hour march routine. All of which is why a normal large body of infantry moves something closer 8-12 miles per day than the 24 miles (8 hours x 3.1mph) per day implied by Wikipedia’s Average Human Walking Speed.
Historians doing studies of campaigns thus tend to use these sorts of rule-of-thumb speeds without much feeling the need to explain why armies move so slow because I think they expect that most of their readers are either fellow historians or former soldiers and in either case, already know. These rules of thumb, in turn, derive from staff planning in the age when armies still mostly walked to war (especially the 1800s and early 1900s): those staff office planners would have (and presumably still do have) elaborate tables of how many men can move how fast over what sort of roads in what kind of weather – because bad staff work multiplied over massive armies can mean catastrophic logistics and timing failures (see: Frontiers, Battle of the (1914) for examples).
If anything, for a medieval army of conscripts, fresh from a successful battle, with a long supply-train moving off of the main roads, 12 miles per day is actually quite fast. Large armies with lots of wagons often strayed into single-digit marching speeds. And, to be clear, marching speeds are highly variable based on terrain and the rest.
Bret Devereaux, “New Acquisitions: How Fast Do Armies Move?”, A Collection of Unmitigated Pedantry, 2019-10-06.
September 8, 2022
QotD: Pre-modern armies could not march much faster than 8-12 miles per day … on good days
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