How many units attacking vs. how many defending? I would think that you can expect that each of your Warriors would kill at least one Barb Warrior before dying, so a 3-4 unit garrison would go a long way.
Have you gotten an Adventurer yet? It seems from your last update you should have a ~16-XP unit available. A four-promotion Warrior should be almost unbeatable in a city.
Have you gotten an Adventurer yet? It seems from your last update you should have a ~16-XP unit available. A four-promotion Warrior should be almost unbeatable in a city.

![[Image: Civ4ScreenShot0666pngry.png]](http://img.imgcake.com/Civ4ScreenShot0666pngry.png)