Players start their bases inside a heavily populated, computer-controlled kingdom, already extended all over the map. Native buildings are everywhere, but you don't need to raze everything.
PLAYER 2 SHOULD BE SET AS A NEUTRAL COMPUTER. Other players may be human or computer in whatever teams.
Despite the large number of buildings, the invaded country (player 2) is not a superpower and usually starts developing slowly. It is meant to be more a scenario than an enemy. The real enemies are the other invaders, but the kingdom may become a decent fighter too.