[quote=So Boerd]
Would an army made of only mounted units go faster than an army of infantry?
[/quote]

It would depend. Horses can't be ridden faster than a walking pace when you're taking them across a long journey. Horsemen will definitely go faster in battle, and could certainly cover ground faster than a troop of infantry. If your purpose is to raid a village, then get the fuck out of dodge, said horsemen would have covered a lot of ground before any non-mounted infantry could show up.

I'm encountering a lot of these little situations while making rules, and I think I'm just going to need to relegate them to the 'solve it via roleplay' pile, since creating specific rules for them would introduce needless complexity.