Most don't, there are very few "rebel cities" that are scrypted to represent actual factions/tribes that cannot be represented in the game due to limits of the RTW engine. You will see these rebel cities have a full stack in its capital, and a roaming full stack. Also, once you siege the city another army pops up. I can't remember them all, but I know there is 1 in the Iberian peninsula and 2 in/around the Alps representing 2 major gallic tribes (Helvetti, and Boii) IIRC.
....ps, its been years since I posted in this forum!
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