While standing on home-soil you will be able to call upon the aid of your city's defences, the extent of which will depend on the wealth and efforts of the city government. If you spot an enemy on your home-soil, type CRY followed by their name to cry aloud a call to the local guards to deal with this unwanted foe. The might of the foe will determine the strength and size of the city defenders employed to answer your call.
WARNING: you will only be aided by the NPCs when you use CRY if you are outnumbered, that is to say if the combat prowess of the city enemy invaders is twice or more that if the home citizens able to defend.