Light infantry.

[Cyclops]

...I haven't really noticed lights doing well though in wooded terrain.Lights versus cavalry,yes....

I took a Carthi army (FM, L-P spears, citizen cav and a balearic slinger or two) and an allied greek army (regional hoplites, allied general and akontistai) into Italy, ran into a Roman stack (hastati, principes, one triarii and a merc or two) on a wooded hillside in Bruttium and was cut to shreds. Its a battle I would ordinarily have won and I put it down to the terrain bonuses.

edit: the merc or two were gallic IIRC. They carved me up good.