system
Given the following post, respond as if you're commenting on Reddit:
human
(ASOIAF) If sometime around the end of AGOT and the beginning of ACOK Robb Stark and the Northmen had simply seceded and retreated North rather than marching south to recover Sansa, would they have been successful?

Would any of the Crown's armies have been able to bring the North back into the fold? I know that in AGOT Cersei lectured Joffrey on the futility of trying to do so, but was she correct? Note: I'm not asking if Daenerys could do so; obviously dragons would have a massive impact on the outcome. I'm just asking if the combined might of the Lannisters and whomever else they could bring to their side would have been enough to reconquer the North.
gpt
It would be quite an undertaking for the Southern Kingdoms to try and bring the North back through force alone. Armies could easily be cut off at the neck so marching on the North would be very difficult. A navy might help to capture some of the coastal cities but that stills leaves a lot of inland territory. The North is just massive. The Southern Kingdoms might be able to do it but they would face incredible loses not to mention if they tried this during the winter they would be screwed. Keep in mind the North was the next to last territory to be brought into the Seven Kingdoms in the first place and that took dragons so without the dragons it would be pretty futile.