When I was a kid, my friend and I used to play Command & Conquer: Red Alert together almost every other night over a dial-up connection. Mostly, we played against AI opponents, trying to take on more and more of them as we got better at the game. The catch was that the AI was incredibly passive: Save for a few small raids, AI players would happily build ever-larger bases and armies to no apparent end. However, the moment one of your units attacked their harvester, the AI would attack relentlessly with everything it had. It was incredible to watch happen on the minimap: In the blink of an eye, the entire map would seem to lurch toward whichever player had committed the offense. It was basically the They Are Billions of the 1990s.
This is a companion discussion topic for the original entry at https://waypoint.vice.com/en_us/article/j5n89x/why-great-strategy-games-need-great-ai-generals