Playing as Sweden and at war with Norway. I have some aggressive city-state allies who have taken and razed 3 of his cities, with just the capital left. I reduced it to 0 strength and it seems that even though the CS swordsman was full strength, he could not take the city, even after I set him up to do so. Can't say I have been in this spot before, so I was just wondering if that is prohibited. I don't really want to wipe any more civs out (I was forced to wipe out Mapuche earlier because I started tucked off in a corner and nobody puts Kristina in a corner.