Given that a man can only walk at a speed of about 4 miles per hour there is a physical limit to how far an army on foot could travel in one day.
The actual distance tends to vary according to how many hours the army is forced to march over a 24 hour period. The maximum obviously being twenty four with no breaks for rest or food, so theoretically the maximum distance an army can march in one day must be around 96 miles. Any distance greater than that would have to be explained.
In practice most armies marched for 2 to 3 hours twice a day with a one or two hour break around midday for lunch, giving an average daily march rate of between 8 and 14 miles per day. A forced march merely involves marching for longer not faster.
Incidently, I read the other day that Crawford increased the daily marching distance covered by the Light Division in the Peninsula not by making them march faster but by ordering that no man was to step out of the ranks to avoid a puddle or other obstruction in their path. He reasoned that men stepping out of ranks to avoid such obsticals caused a small delay which triggered an ever increasing ripple of lost impetus down the column costing the division the equivalent of over one hours march. The men hated him for it, but were punished if they stepped around of over a puddle and in doing so earned the reputation for being the fastest division in the British army.
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