well, i don't know if i'm stupid or what, raiding 2 ai is easier said than done, even aggressive loki can't do it.
assume open map type, if u build forward on one and pick heimdall, undermine+hersir+rc can wrack havock on one (say a greek) easily. but then, by 8-9 minutes mark, the other one (say a eggy) will simply bypass ur invading army and march straight into ur town.
simply don't have the resources to fight 2 army at the same time. the ai on hard is very efficient on econ, eventhough they don't research all the improvement tech. but as fast aggressive loki, neither will i. resouce wise, i might just be a tad above 1 guy on the first 5 mins. 2 vs 1, no way i can match them.
the only success i have so far is playing on wallable map like highland. wall of one side, and only a small portion of the other side open, then put down 2-3 hillfront.