andrew0568: This is actually a strategy the AI used against me on Heroic. I think it's impossible to beat. Let me know what you guys think.
Be Covenant vs UNSC
1. Immediately build temple
2. Use the ghost to collect resources towards bottom of base
3. After temple, start vehicle factory then a warehouse
4. Use ghost to collect resources towards top right of base. Have prophet of regret join once he spawns. Then collect resources to left of the base
5. Start a 2nd warehouse. Upgrade 1st warehouse when you can
6. Prophet and ghost collect resources in the two spots to the bottom right of the base
7. Make gravity lift's rally point on top of it
8. When you have enough resources upgrade 2nd warehouse. Then wait till you have 350 to start a wraith
9. After you start a wraith, once you get 100, build a 3rd warehouse
10. Once wraith spawns, attack with this force. Everytime your resources hit 350 start spawning a wraith and it'll join your army once it's ready.
This all takes only a few minutes (~2:53). In this amount of time the UNSC can't start building anything that is effective against this group since it needs 2 reactors to get the RPGs/spartan jack upgrade/vehicle factory/aircraft factory. I know this is just one level on Heroic, but I thought it was kinda neat...
Spartans and flamers would wreck you.
You can't play halo wars until you see this video
http://www.escapistmagazine.com/videos/view/zero-punctuation/645-Halo-Wars
I've been perma-banned at bungie.net :(