I'm using the RTR mod. on hard/hard. But surely the level setting only increases the "strength" of the AI units rather than the intelligence/tactics?

I'm not certain if this should effect the AI troops overall, but the general, has always tried to flank me, essentially leaving his main body of troops behind, engaing him with a jav.cav unit, & he just runs off, (not routing), so I guess they're using skirmish tactics. This means that the troop units are left without a leader nearby.

Also the previous is by no means a way to wipe them out without losses, archer & hop. units took a savaging in all the battles from javlins, I just use the horse prior to the roman troops running out of jav's & charging the line, maybe this has an added effect, although I'm not certain how it could be of benefit.