Because of this entry by Siberian Wolf, I have asked the system testers to run about 20 different custom battles against Amazon Heavy Peltasts with some cavalry support but no advanced weaponry. Tests are conducted with 7.0 units (which allows the the Romans to fight with new weapons).
Human Player- Romans
three units of heavy infantry (cohort i)
one auxiliary horse archer
two caro ballista batteries
two field engineer corp unit to construct area denial "minefield" (tribulus/caltrop).
AI- Libyan Amazons
12 units of HPs
3 units of elite Libyan longs word cavalry units (with the capability of pole sling).
The Roman were obviously outmatched and vastly outnumbered, but only lost one battle out of 10.
The second batch of tests
AI - Romans
12 units of heavy infantry (cohort i)
two auxiliary horse archer
four caro ballista batteries
two field engineer corp unit to construct area denial "minefield" (tribulus/caltrop).
Human Player - Libyan Amazons
12 units of HPs
3 units of elite Libyan longs word cavalry units (with the capability of pole sling).
The Amazons were obviously outmatched and outnumbered units wise, but won all the battles (10 out of 10).
I think this really points to the AI's weakness in conducting a battle. But not necessary that the Amazon HPs were too strong.