Just wondering if you ever considered adding experience points? Either add another building to create a general, similar to senator, Depending on the level of the general will depend how big of an army he can command, and with victory the general can accumulate experience points that would add to the attack bonus of the army. Experience points can only be added if the battle had enough troops, and the battles must be against members from another alliance. Maybe further limit this, the alliance must be officially at war with each other. Another option is to make experience points specific to a city. So if you send attack from castle A- that castle only gets the points, maybe separate offence and defense experience (or not). If you decide to accept the general idea, please make it so we can move him from castle to castle, please don't make it castle specific like senate