Thanks for the swift response.
Sorry I don’t see the disadvantage, if I do get attacked by the AI I almost certainly will defeat them and would be even more delighted if it was the garrison from the city that attacked me.
Unless I cannot attack on my next move it seems to me moving deep into enemy territory could be a very effective method of weakening a city of its defences by getting them to attack you.
As regards the Risk map it seems to me that while you literally wont have a Risk type campaign having regions using only one tactical map is very close to having a Risk type environment even the forced marches alone could effectively create the same conditions.