There are issues with delivering items from within a city to armies camped outside. I believe it's related to haulers needing to physically move items to the edge of the city map.
Do you use warehouses?
Well, as I mentioned in the other thread, I am unsure how warehouses actually work. I can see how they offer extra room for storage, but I'm not sure how they directly or indirectly are supposed to influence how things are run. Like, is it for some reason more plausible that resources will be distributed to demands if there's a warehouse? How does it work?
Also, I guess it's interesting that some worker actually has to move the goods physically to the map edge.
About that (I guess it's a different topic altogether): to what extent are good moved around physically in settlements like you see the wheelbarrow guys if you actually check in a city screen? Is this actually done that way in all settlements including computer ones? I also seem to run into performance issues (basically FPS death on quite a new computer) when I get to a later game with bigger cities and computer factions being very busy. Including when on overworld view. Is it actually actively rendering all the particular good transports moving over the settlement maps of all the settlements in the world or something? I can see how that would cause fps death.
Warehouses do two things: they store items, and they increase delivery range. Most structures can only deliver items to 10 tiles away or so. Warehouses have a practically unlimited delivery range.
The wheelbarrow people technically exist for each city (not villages) in the world. Their overhead is incredibly small, though, as it's essentially moving along a number line. I believe that the current performance drag is down to logic running on individual structures, but I'll look into that more after tactical combat.