Not sure how it triggers or honestly what is going on during it but it's awesome. Talking about the epic battles that break out between species randomly while I have been patrolling. So far I have seen this occur three times, twice at skywatch on earth and once at the area with the busted ship in the middle of the yard on Venus, sorry, I don't know that areas name. I've been trying to find a trigger but haven't been able to. If you have experienced this crazy battle, and know what I'm talking about feel free to post how you felt about it, or if you've seen it in other areas. Trust me, you'd know if you've been a part of one of these. Talking ultra units all of the place. Anyway, keep enjoying the game your way all!