As I said, I only tested once, so the results are not necessarily accurate. If I were to guess, you might get a bonus that diminishes with additional cities. I lost my capital in the GOTM when I had several cities, but I only used one additional city in my quick test. It would also explain the results of a test conducted for one of the deity plus succession games where they decided to use a phalanx to defend a capital instead of building an offensive unit to attack some barbs. Barbarians only stack with a leader. If a ship unloads 2 barb attack units, then one of them can be bribed and attack the other. You will have to do a search to find out if defence bonuses are added or multiplied, but I think that they are multiplied on each other, it was a little more convenient to say 2, however. I think the warrior in my test did become a veteran at some point during combat. I suppose this discussion might indicate that a fortified phalanx is an adequate defence against a couple barbs. I have come up with an Option 5, however. Option 5: Masonry. Get Masonry as the off path tech, and then in the unlikely event that your capital is taken, build a new one. Make sure that you have a city with 2 forest to speed up the job, taking advantage of the fact that a city producing a palace suffers no waste if you don't already have one. Alternatively, build city walls in your city, which should provide adequate defence.