Archers and hills, hmmm, its an old gripe, and yes I can partly see why it was done, but to me they are still completely wrong. I'll explain, build a city on a hill anywhere and even at size one, its virtually invulnerable with a couple of garrison 1 archers. Often its harder to take than a size 7 city thats been there for 2000 yrs (on a grassland) with a monument , library monestary etc. Wrong. Just completely wrong.
I wished some kind of sliding scale had been used which made small cities (villages really at size 1 or 2) a lot more vulnerable. As I said, I can see why Archers were made that way, but the double bonus for a hill city (+25% for building the city on a hill, then another 25% because its on a hill (hmm wrong again), and then another 50% because its a large village, AND another 25% from fortification (what fortification ? 1000 people live there thats all) AND THEN yet another 25% garrison bonus......just too much, and completely unrealistic. Mature cities yes, but tiny ones really shouldn't receive that kind of invulnerable bonus in my opinion.