Making my first map which will be a 1v3 and I have a very simple question.

How do I get the AI to actually build up a settlement, army and attack/defend?

Basically what I want to do is have all four players start with just a keep and a few stores, and build up and have a free for all.

Anyone? Or am I the only person playing SH3 now? LOL

You cannot do what you ask, for the simple fact there is no a.i in stronghold 3. Every thing is done by events and way points.

The best you can do is create an invasion mission, you would have to build the castles your self in the editor which is very easy anyway, then you would need to create a couple of events which constantly spawns in allied and/or enemy troops. It is very easy to do takes 5 minutes to set up events.

However, if you are not interested in invasion mode and have completed the campaign... then sadly you are done with this game as like i said no a.i means no skirmish which means unless you play online with friends the games life span is over.

That's very disappointing to hear. Skirmish is the best mode TBH.