CIV2 Hotseat had this problem as well, infact any turn based system has this problem, Its like getting up from the Monopoly board during your opponents turn to go to the bathroom, and when you get back No-body will tell you what happened... frustrating... annoying... when its people we get angry at them, maybe because we dont trust they they played fair....but a computer? You know it had to play fair, but you just want to know what it did without having to 'work it out'
Maybe if there was a 'indicator' icon that showed activity in grid ...X,X... or something... an arrow showing troop movement,
If troops have taken your city, you gotta ask yourself, where were they to get NEXT to your city and take it, and How many defences did you have stationed there?