Cities tend to have a high defensive CV (2nd number you see on the USSR counters), so it is best to use deliberate attacks on them, not hasty ones.
But I find it is easier to get replies to what you want to know by asking direct questions, aka
"how do I take the city"
"how do I flip hexes"
So, not really sure what you want to know here tbh. But trying and failing is the way to go :)
I am by no means a good player, but since you asked for a short AAR from the Road to Minsk with explanations as to how/why things are done, I will make a short one on that Scn. Take warning though that as allready mentioned, I am not at all the best mentor. Far from it to be true :)
Anyway, a Road to Minsk AAR coming up shortly.
"Hun skal torpederes!" - Birger Eriksen
("She is to be torpedoed!")