Green_Power
Chieftain
Sounds too exploity for my taste. Sure, the combat AI is terrible, but I don't think I would have fun playing a strategy like that. Why play at all?The strategy for Epic speed is as follows:
1. Declare war
2. Wait for AI units to come and decimate them with archery units
3. Enter AIs now-empty lands and pillage, burn and capture to your fat black heart's content
4. Profit (cruise to your preferred victory).
This is how you do it on Standard too, but the thing is that on Epic the AI has no time to reinforce its forces before and during phase #3. On Marathon it's even more easy to wage war in this regard.

And, that strategy will depend on certain factors, like the archery technology you have, the type of terrain around you, and the difficulty level. Not sure if that works that well on Immortal and Diety.