The reason for bumping this thread is a
link posted in the Civ 3 modding forum to a
comment from sulla, that marines during their attack are ignoring the city defense bonus. I hope it is o.k. for sulla, when I citate here the part of sulla´s comment about the Marine unit:
Marine (8/6/1): This is another speciality unit that can be very useful in the right circumstances. Their special ability is to attack cities from ships, during which they ignore city defensive bonuses. This might not seem like much, but with that ability marines have 8 attack against the 12.5 defense infantry have when fortified (compared to 22.5 in a metropolis when the city defensive bonus is added). Marines can be very useful in blitz invasions of another continent, such as capturing a city on the coast with marines, then moving the invasion force of tanks into the city and hopping to other cities on their rail network. And marines are the only units that can capture a city on a 1-tile island, such as the ones that exist on the earth map that is packaged with the game. If you can't secure oil for tanks, marines are your best industrial age attack force. They aren't useless at all, just speciality units - keep that in mind.
As the civers in this forum normally have much more experiences in playing standard C3C than we modders, please help in answering, if you have ever noticed such a big not documented advantage for marines by ignoring the city defensive bonus when attacking cities.