No eyed deer.
When attacking into an enemies territory, it is usually best to keep your units all on the same tile. This has a number of advantages and 1 dissadvantage. The disadvantage is that you are suseptable to collateral damage units, so if a catapult attacks your stack 6 units will be damaged rather than 1. The advantages are: It allows the best unit you have to do the defending (ie. if a spearman attacks your axeman will defend, if a catapult attacks your horse archer will defend); it provides protection for your damaged units, eg. if a unit wins a fight but is severly damaged, if it was on its own it would be picked off easily, but if it is in a stack the other members of the stack will defend until it is healed.
Every reasorce must be 'hooked up' to recive the civ wide benifit of it (in this case providing copper for units). You do not need to conect it to get the tile benifits (in the case of copper 4 hammers). This connection can be with roads, rivers or by sea (with the appropriate tech and only between cities). If the reasorce is coonected to some cities and not others only those it is coonected to recive the benifit. It must be connected to the capital to allow you to trade it to other civs.
Thanks for the quick response!
Regarding resources so it means that as long as the resource is within the city radius and there's a white circle on it, the benefits are only to the city itself.
If i want that benefit to extend to other cities, I gotta build roads from that resource tile and lead into another city?