But in the case of a civil war the supply lines themselves are under threat at all times. It's even worse than that, because military action itself will likely

But in the case of a civil war the supply lines themselves are under threat at all times. It's even worse than that, because military action itself will likely harm their own supply lines, because it's the populace that creates those supplies. If you're fighting against the populace, then you're not getting supplies from them.