One thing I would love to see in (but fairly sure not to) is proper supply lines and baggage trains in M2TW. If nothing else it could be a place for archers to reload on ammo. Ideally of course I would love the reserve troops to stay there protecting it, and for knights to get a new lance after a charge or a new horse after the last one was shot or some quick armour repair/replacement.
I suppose it would just mean less troops on the actual field though
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