What can I say this is one of those 10 minute scenarios. It seems that Lancelot cheated with your wife (you're Arthur) and also Lancelot took over Camelot and banned you. But there are some loyal pals of Arthur and they decide to find him and bring him back to the throne (yeah its a ok story).
If you don't find Arthur within some time (**hint he isn't near your enemy's place) than you're dead so retry. Its pretty easy to find him since you start out in Castle with a barracks, TC, some villagers, 3 Longbowmen, 2 Light cavalry, and some other stuff that don't matter much.
Now lets say you found Arthur, bring him back to your town, and have a economy going. Take my advice this scenario won't be very long so make more military units and don't worry about villagers. Lancelot and his gang (won't say how many since that'll be no fun) comes at you and just make sure you aim at Lancelot the whole time and you'll be fine.
Also I have to say that the map really was much looked like he/she copied one spot and pasted it to another spot but moved few of the units/objects.