I would really love to see a unit supply system as an optional game mode. Basically supplies would only drain when the unit is outside of your own or allied territory.
The size of the supply would increase with tech/civics, and units would slowly perish if unsupplied.
Resupply would just happen by ending a turn inside your/or allied borders/or by visiting a fort. Another way to resupply would be to pillage any tile/raiding a trade caravan.
Different terrain could drain supplies at different rates (i.e. ice and desert would drain it more quickly as your soldiers couldn't forage as easily to supplement their rations).
The ultimate goal is to make long distance warfare more difficult, to give defenders a bigger advantage as they can 'hold out' for a time and survive, and finally to limit exploration of the map to certain phases of the game, i.e. you can't just build a scout in the ancient era and let it explore several continents by itself.
Exactly! This is a perfect description of the proposal of this post! With your permission I will use your comment in the post to add details so that the next readers have a better understanding of the proposal and can see its positive points.
So you should be able to still embark for a far distance and manage to win a war if you embark with a lot of supplies (not just a caravan going back and forth), right?
No, to cross the oceans over long distances without a resupplying plan is crazy. The navigators' plan was if possible to land to find fresh water, which was the big problem at the time, once the explorer's goal was reached he had two options, he could resupply with food and water, establish an outpost there and leave some men garrisoning (with supplies of course) or else once resupplied resume the journey back to his nearest port of origin.
Your supplies are consumed while you move, so if you don't resupply periodically, your troops will suffer a penalty (here again feel free to choose which penalty you want to impose in these situations). In the proposal we have presented would be given alternatives to the player so that he can guarantee a resupply without the support of a logistic unit, the player would have to find for instance plantations, wheat fields (maybe wheat field or other food resource in a neutral area) to resupply, so you are free to decide this, to decide what would be the alternative ways of resupplying, but you must keep in mind that these alternative ways must be much rarer for the player or with some risky to feel more concerned in establishing a logistic chain to resupply his troops during his long distance exploration activities.
Defeating and destroying barbarian settlements would be a possibility of resupply, so imagine that you just defeated a group of barbarians by invading your settlement and in the process you got spoils there, food, drink, weapons and so on. So with this you got supplies for your troops, imagine you find some prisoners in these settlements, then some of them can be recruited to your armies, with this you also recover the health of your troop which represents your amount of soldiers integrated into your military unit. Then defeating pirate ships or barbaric settlements can help you recover and stay away from home longer. It's risky, but it's an alternative.
The overall idea of unit supply is a good one. The tricky part is to impliment it without adding even more micro to the gameplay. Managing supply carts and the like will become tiresome quickly.
Well if you can read the comments and the proposal itself, you may notice that it is not about adding more micro management, I believe it was very clear both by me and by others who made complementary comments that the supply units would be automatic like the caravans that are going and coming from city to city autonomously, you just need to define which route and the rest it will do.
Maybe build a unit for suplly chain, and supply the unit in city state and after back to the front
Perfect, exactly this!