That's actually quite a small amount of the army they have when playing. Just playing the single player stuff, and went to attach a Chaos controlled land. Entered, built a base, tech'd up enough to launch Dreadnaughts and sent 5x Dreadnaughts and both Terminator squads in there, and they get destroyed in under a minute.
Any tips on how I can possible do this map? The computer seems to ignore the player cap / vehicle cap limit and sometimes they have no less than 10 of those spider walker vehicles along with Daemon Prince's x3 and the large superpower thing with tons of health.