I would be perfectly happy if battleships, frigates and artillery 'softened up' ALL units in a good defensive position-be that within a city or in any other terrain. So, units in a hill-fort could have their defensive bonuses reduced by naval and land bombardment BEFORE an attack by conventional units. I don't think this ability should be restricted to cities alone. I do think that naval vessels should also be able to bombard terrain improvements too. Yours, Aussie_Lurker.